#For details about changes, see the <a href="history.html">Change Log</a> .
@faq_1000_h1
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...
@@ -1193,7 +1184,7 @@ Mit Maven 2
#Are there any known bugs? When is the next release?
@faq_1012_p
#Usually, bugs get fixes as they are found. There is a release every few weeks. Here is the list of known and confirmed issues as of 2007-10-03:
#Usually, bugs get fixes as they are found. There is a release every few weeks. Here is the list of known and confirmed issues as of 2007-10-20:
@faq_1013_li
#Some problems have been found with right outer join. Internally, it is converted to left outer join, which does not always produce the same results as other databases when used in combination with other joins.
...
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@@ -2798,820 +2789,820 @@ Mit Maven 2
#Version 1.0.60 (2007-10-?)
@history_1010_li
#User defined aggregate functions are not supported.
#JdbcXAConnection: starting a transaction before getting the connection didn't switch off autocommit.
@history_1011_li
#Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
#User defined aggregate functions are not supported.
@history_1012_li
#Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
#Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
@history_1013_li
#Linked tables: now tables in non-default schemas are supported as well
#Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
@history_1014_li
#New Italian translation from PierPaolo Ucchino. Thanks a lot!
#Linked tables: now tables in non-default schemas are supported as well
@history_1015_li
#CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods.
#New Italian translation from PierPaolo Ucchino. Thanks a lot!
@history_1016_li
#Prepared statements could not be used after data definition statements (creating tables and so on). Fixed.
#CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods.
@history_1017_li
#PreparedStatement.setMaxRows could not be changed to a higher value after the statement was executed.
#Prepared statements could not be used after data definition statements (creating tables and so on). Fixed.
@history_1018_li
#The H2 Console could not connect twice to the same H2 embedded database at the same time. Fixed.
#PreparedStatement.setMaxRows could not be changed to a higher value after the statement was executed.
@history_1019_li
#The H2 Console could not connect twice to the same H2 embedded database at the same time. Fixed.
@history_1020_li
#CSVREAD, RUNSCRIPT and so on now support URLs as well, using URL.openStream(). Example: select * from csvread('jar:file:///c:/temp/test.jar!/test.csv');
@history_1020_h3
@history_1021_h3
#Version 1.0.59 (2007-10-03)
@history_1021_li
@history_1022_li
#When the data type was unknown in a subquery, sometimes the wrong exception (ArrayIndexOutOfBounds) was thrown. Fixed.
@history_1022_li
@history_1023_li
#If the process was killed while the database was running, sometimes the database could not be opened ('double allocation') except when the system property h2.check was set to false. Fixed.
@history_1023_li
@history_1024_li
#Multi-threaded kernel (MULTI_THREADED=1): A synchronization problem has been fixed.
@history_1024_li
@history_1025_li
#A PreparedStatement that was cancelled could not be reused. Fixed.
@history_1025_li
@history_1026_li
#H2 Console: Progress information when logging into a H2 embedded database (useful when opening a database is slow).
@history_1026_li
@history_1027_li
#When the database was closed while logging was disabled (LOG 0), re-opening the database was slow. Fixed.
@history_1027_li
@history_1028_li
#Fulltext search is now documented (in the Tutorial).
@history_1028_li
@history_1029_li
#The Console did not refresh the table list if the CREATE TABLE statement started with a comment. Fixed.
@history_1029_li
@history_1030_li
#When creating a table using CREATE TABLE .. AS SELECT, the precision for some data types (for example VARCHAR) was set to the default precision. Fixed.
@history_1030_li
@history_1031_li
#When using the (undocumented) in-memory file system (jdbc:h2:memFS:x or jdbc:h2:memLZF:x), and using multiple connections, a ConcurrentModificationException could occur. Fixed.
@history_1031_li
@history_1032_li
#REGEXP compatibility: So far String.matches was used, but for compatibility with MySQL, now Matcher.find is used.
@history_1032_li
@history_1033_li
#SCRIPT: the SQL statements in the result set now include the terminating semicolon as well. Simplifies copy and paste.
@history_1033_li
@history_1034_li
#When using a subquery with group by as a table, some columns could not be used in the where condition in the outer query. Example: SELECT * FROM (SELECT ID, COUNT(*) C FROM TEST) WHERE C > 100. Fixed.
@history_1034_li
@history_1035_li
#Views with subqueries as tables and queries with nested subqueries as tables did not always work. Fixed.
@history_1035_li
@history_1036_li
#Compatibility: comparing columns with constants that are out of range does not throw an exception.
@history_1036_h3
@history_1037_h3
#Version 1.0.58 (2007-09-15)
@history_1037_li
@history_1038_li
#System.exit is no longer called by the WebServer, the Console and the Server tool (except to set the exit code if required). This is important when using OSGi.
@history_1038_li
@history_1039_li
#Optimization for independent subqueries. For example, this query can now an index: SELECT * FROM TEST WHERE ID = (SELECT MAX(ID) FROM TEST) This can be disabled by setting the system property h2.optimizeSubqueryCache to false.
@history_1039_li
@history_1040_li
#The explain plan now says: /* direct lookup query */ if the query can be processed directly without reading rows, for example when using MIN(indexed column), MAX(indexed column), or COUNT(*).
@history_1040_li
@history_1041_li
#When using IFNULL, NULLIF, COALESCE, LEAST, or GREATEST, and the first parameter was ?, an exception was thrown. Now the highest data type of all parameters is used.
@history_1041_li
@history_1042_li
#When comparing TINYINT or SMALLINT columns against constants, the index was not used. Fixed.
@history_1042_li
@history_1043_li
#Maven 2: new version are now automatically synced with the central repositories.
@history_1043_li
@history_1044_li
#The default value for MAX_MEMORY_UNDO is now 100000.
@history_1044_li
@history_1045_li
#The documentation indexer does no longer index Japanese pages. If somebody knows how to split Japanese into words please post it.
@history_1045_li
@history_1046_li
#Oracle compatibility: SYSDATE now returns a timestamp. CHR(..) is now an alias for CHAR(..).
@history_1046_li
@history_1047_li
#After deleting data, empty space in the database files was not efficiently reused (but it was reused when opening the database). This has been fixed.
@history_1047_li
@history_1048_li
#About 230 bytes per database was leaked. This is a problem for applications opening and closing many thousand databases. The main problem: a shutdown hook was added but never removed. Fixed. In JDK 1.4, there is an additionally problem, see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4197876. A workaround has been implemented.
@history_1048_li
@history_1049_li
#Optimization for COLUMN IN(.., NULL) if the column does not allow NULL values.
@history_1049_li
@history_1050_li
#Using spaces in column and table aliases was not supported when used inside a view or temporary view.
@history_1050_li
@history_1051_li
#The version (build) number is now included in the manifest file.
@history_1051_li
@history_1052_li
#In some systems, SecureRandom.generateSeed is very slow (taking one minute or more). For those cases, an alternative method is used that takes less than one second.
@history_1052_li
@history_1053_li
#The database file sizes are now increased at most 32 MB at any time.
@history_1053_li
@history_1054_li
#New method DatabaseEventListener.opened that is called just after opening a database.
@history_1054_li
@history_1055_li
#When using the Console with Internet Explorer 6.0 or 7.0, a Javascript error was thrown after clearing the query.
@history_1055_li
@history_1056_li
#A database can now be opened even if class of a user defined function is not in the classpath. Trying to call the function will throws an exception.
@history_1056_li
@history_1057_li
#User defined functions and constants may not overload built-in functions and constants. This didn't work before, but now trying to create such an object will fail.
@history_1057_li
@history_1058_li
#Improved MultiDimension tool (for spatial queries): in the last few releases the tool was actually slower than using a regular query (because index lookup got faster, and because the tool didn't support prepared statements) Now the tool generates prepared statements, and the performance is better again (about 5 times faster for a reasonable amount of data).
@history_1058_li
@history_1059_li
#Adding a foreign key or when re-enabling referential integrity for a table failed when checking was enabled and the reference contained NULL.
@history_1059_li
@history_1060_li
#For PgServer, character encoding other than UTF-8 did not work correctly. Fixed.
@history_1060_li
@history_1061_li
#Using a function in a GROUP BY expression that is used in a view as a condition did not always work.
@history_1061_h3
@history_1062_h3
#Version 1.0.57 (2007-08-25)
@history_1062_li
@history_1063_li
#New experimental feature MVCC (multi version concurrency control). Can be set as a option when opening the database (jdbc:h2:test;MVCC=TRUE) or as a system property (-Dh2.mvcc=true). This is work-in-progress, use it at your own risk. Feedback is welcome.
@history_1063_li
@history_1064_li
#The version number is now major.minor.micro where micro is the build number. Not all version are public, so there may be gaps in the micro. The minor changes when there is a file format change.
@history_1064_li
@history_1065_li
#The backup tool (org.h2.tools.Backup) did not work. The restore tool did not work when the -db parameter was used. Fixed. The documentation of the backup tool has been changed: only one database may be backed up at any time.
@history_1065_li
@history_1066_li
#Opening large read-only databases was very slow. Fixed.
@history_1066_li
@history_1067_li
#New Japanese translation of the error messages thanks to Ikemoto Masahiro. Thanks a lot!
@history_1067_li
@history_1068_li
#Disabling / enabling referential integrity for a table can now be used inside a transaction.
@history_1068_li
@history_1069_li
#Rights checking for dynamic tables (SELECT * FROM (SELECT ...)) did not work. Fixed.
@history_1069_li
@history_1070_li
#Creating more than 10 views that depend on each other was very slow. Reconnecting was slow as well. Fixed.
@history_1070_li
@history_1071_li
#When used as as Servlet, the H2 Console did not work with SSL (using Tomcat). Fixed.
@history_1071_li
@history_1072_li
#When altering a table with foreign key constraint, if there was no manual index created for the referenced columns, the automatically created index was dropped while still being used. Fixed.
@history_1072_li
@history_1073_li
#Check and foreign key constraints now checks if the existing data is consistent (this can be disabled by appending NOCHECK). It is also possible to check existing data when re-enabling referential integrity for a table.
@history_1073_li
@history_1074_li
#Some unit tests failed on Linux because the file system works differently. The unit tests are fixed and should work now.
@history_1074_li
@history_1075_li
#Can now incrementally translate the documentation. See also FAQ.
@history_1075_li
@history_1076_li
#Improved error messages: some tools can't show the root cause of an exception. Adding the message of the root cause to the message of the thrown exception now where it makes sense.
@history_1076_li
@history_1077_li
#The H2 Console can now connect to databases using JNDI. The driver class name must be a javax.naming.Context, (for example javax.naming.InitialContext), and the URL the resource name (for example java:comp/env/jdbc/Test). This should also work for linked tables.
@history_1077_li
@history_1078_li
#Google translate did not work for the H2 homepage. It should be fixed now.
@history_1078_li
@history_1079_li
#The CONVERT function did not work with views when using UNION.
@history_1079_li
@history_1080_li
#The build now issues a warning if the source code is switched to the wrong version.
@history_1080_li
@history_1081_li
#The default lock mode is now read committed instead of serialized.
@history_1081_li
@history_1082_li
#PG server: data was truncated when reading large VARCHAR columns and decimal columns.
@history_1082_li
@history_1083_li
#PG server: when the same database was accessed multiple times using the PostgreSQL ODBC driver, the pg_catalog schema update failed, and connecting to the database was not possible. Fixed.
@history_1083_li
@history_1084_li
#Some file operations didn't work for files in the root directory. Fixed.
@history_1084_li
@history_1085_li
#In the Restore tool, the parameter -file did not work. Fixed.
@history_1085_li
@history_1086_li
#Two-phase commit: commit with transaction name was only supported in the recovery scan. Now it is always supported.
@history_1086_li
@history_1087_li
#The column name C_CURRENT_TIMESTAMP did not work in the last release.
@history_1087_li
@history_1088_li
#OpenOffice compatibility: support database name in column names.
@history_1088_h3
@history_1089_h3
#Version 1.0.56 (2007-08-02)
@history_1089_li
@history_1090_li
#A new tool to help translation has been implemented: src/tools/org/h2/tools/i18n/PrepareTranslation. This tool can detect delta changes in the original (English) and prepends '#' in translation if the original text was changed. It can also extract text from the user documentation (however, it is incomplete).
@history_1090_li
@history_1091_li
#The error messages (src/main/org/h2/res/_*.*) can now be translated.
@history_1091_li
@history_1092_li
#Part of the documentation has been translated to Japanese by Yusuke Fukushima.
@history_1092_li
@history_1093_li
#Some Unicode characters where not supported as identifier name. Thanks Yusuke Fukushima for reporting this problem.
@history_1093_li
@history_1094_li
#The default value DEFAULT_MAX_LENGTH_INPLACE_LOB has been changed from 128 to 1024.
@history_1094_li
@history_1095_li
#A server that implements the PostgreSQL protocol is now included and documented. That means, the PostgreSQL ODBC driver can be used to access a H2 database. See in the documentation for details.
@history_1095_li
@history_1096_li
#The experimental H2 ODBC driver has been removed.
@history_1096_li
@history_1097_li
#The default value for h2.defaultMaxMemoryUndo is now 50000. This avoids out of memory problems when using large transactions, however large transactions are slower because they are buffered to disk. To disable, use -Dh2.defaultMaxMemoryUndo=2000000000.
@history_1097_li
@history_1098_li
#Support for regular expression function REGEXP_REPLACE(expression, regex, replacement) and regular expression LIKE: expression REGEXP matchExpression. However, indexes are not yet used.
@history_1098_li
@history_1099_li
#The old view implementation has been removed.
@history_1099_li
@history_1100_li
#The SysTray tool has been removed, because JDK 1.6 has native support for system tray icons. Use the Console tool (org.h2.tools.Console) automatically installs a system tray icon if JDK 1.6 is used.
@history_1100_li
@history_1101_li
#H2 Console: In the last release, the shutdown button did not work. Fixed.
@history_1101_li
@history_1102_li
#Referential integrity can now be disabled using SET REFERENTIAL_INTEGRITY FALSE. It can also be disable only for one table using ALTER TABLE SET REFERENTIAL_INTEGRITY FALSE.
@history_1102_li
@history_1103_li
#The Backup and Restore tools, and the BACKUP command did not back up LOBs when h2.lobFilesInDirectories was enabled. Fixed.
@history_1103_li
@history_1104_li
#Calculation of cache memory usage has been improved.
@history_1104_li
@history_1105_li
#In some situations record were released too late from the cache. Fixed.
@history_1105_li
@history_1106_li
#The cache size is now measured in KB instead of blocks of 128 byte.
@history_1106_li
@history_1107_li
#CREATE TABLE ... AS SELECT now needs less memory. While inserting the rows, the undo log is temporarily disabled. This avoid out of memory problems when creating large tables.
@history_1107_li
@history_1108_li
#The per session undo log can now be disabled. This setting is useful for bulk operations that don't need to be atomic, like bulk delete or update.
@history_1108_li
@history_1109_li
#The database file could get corrupted when there was an OutOfMemoryException in the middle of inserting a row.
@history_1109_li
@history_1110_li
#Optimization for WHERE NOT(...) and WHERE [NOT] booleanFlagColumn. This can be disabled using the system property h2.optimizeNot.
@history_1110_li
@history_1111_li
#Optimization for conditions like WHERE A=B AND B=X (A=X is added). This often appears in joins. This can be disabled using the system property h2.optimizeTwoEquals.
@history_1111_li
@history_1112_li
#Documentation: the source code in 'Compacting a Database' was incorrect. Fixed.
@history_1112_li
@history_1113_li
#In the H2 Console, result sets could not be modified because the default result set type is now forward only. For H2, now uses scrollable result sets. Also for other databases, but only when the query starts with @EDIT.
@history_1113_li
@history_1114_li
#Views using UNION did not work correctly. Fixed.
@history_1114_li
@history_1115_li
#Function tables did not work with views and EXPLAIN. Fixed.
@history_1115_h3
@history_1116_h3
#Version 1.0.55 (2007-07-12)
@history_1116_li
@history_1117_li
#Support for the system property baseDir. This works for embedded databases as well. The setting is supported by the H2 Console using -Dh2.baseDir or -baseDir
@history_1117_li
@history_1118_li
#LIKE ESCAPE did not work correctly if the pattern was % or _, followed by an escape character, followed by %. Fixed.
@history_1118_li
@history_1119_li
#PostgreSQL compatibility: SET SEARCH_PATH, SERIAL, CURRENT_USER, E'text', $1.
@history_1119_li
@history_1120_li
#In some situations, when many tables with LOB columns were modified (ALTER TABLE), large objects were deleted. Fixed.
@history_1120_li
@history_1121_li
#CREATE TABLE AS SELECT .. UNION .. did not work. Fixed.
@history_1121_li
@history_1122_li
#New column ID for INFORMATION_SCHEMA.INDEXES, SEQUENCES, USERS, ROLES, RIGHTS, FUNCTION_ALIASES, SCHEMATA, VIEWS, CONSTRAINTS, CONSTANTS, DOMAINS, TRIGGERS.
@history_1122_li
@history_1123_li
#If large result sets (backed by a temporary file) where not closed, the file was not deleted. Now, the default result set type is FETCH_FORWARD. This means temp files are deleted automatically (without having to close the result set explicitly). But it also means ResultSet.beforeFirst can only be called for scrollable result sets. To create a scrollable result set, use Statement stat = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY).
@history_1123_li
@history_1124_li
#PreparedStatement.getMetaData is now implemented.
@history_1124_li
@history_1125_li
#Now PreparedStatement.setBigDecimal(..) can be called with an object of a derived class if the system property h2.allowBigDecimalExtensions is set to true.
@history_1125_li
@history_1126_li
#The default database name in the documentation is now jdbc:h2:~/test. Like this, the database is stored in the user home directory (system property user.home). Of course storing the database in the current working directory (as in jdbc:h2:test) still works. Using the user directory avoids the problem that the database is not found if the application runs in another directory than the console.
@history_1126_li
@history_1127_li
#The SQL statement SET ASSERT has been deprecated, because Constants.CHECK is now final. To disable assertions (and improve performance), the system property h2.check can be used. Executing SET ASSERT still works, but has no effect.
@history_1127_li
@history_1128_li
#In the READ_COMMITTED mode, when the multi-threaded kernel is enabled, read locks are now acquired but released immediately after a query.
@history_1128_li
@history_1129_li
#The default trace level for JdbcDataSourceFactory was DEBUG, so when using data sources a trace file was always created. Now the default trace level is ERROR, and the file is only created if necessary.
@history_1129_li
@history_1130_li
#PooledConnection.getConnection took a long time if only one connection was open at any time. Fixed.
@history_1130_li
@history_1131_li
#Referential integrity violation: Two different SQL states are now used for missing parent / existing child.
@history_1131_li
@history_1132_li
#DatabaseEventListener.exceptionThrown has a new parameter: SQL
@history_1132_li
@history_1133_li
#For compatibility reasons, the catalog name can now be used in queries: SELECT * FROM TESTDB.PUBLIC.TEST
@history_1133_li
@history_1134_li
#If SHUTDOWN IMMEDIATELY was called, then the connection was not closed and the database opened from somebody else at the same time, in some cases this could result in errors with LOB files. Fixed.
@history_1134_li
@history_1135_li
#The new view implementation is now enabled by default. To use the old implementation, set the system property 'h2.indexOld' to true (java -Dh2.indexOld=true ..., or in source code Constants.INDEX_OLD = true). If no problems are found, the old implementation will be removed in the next release. The old implementation does not work with multi-level nested temporary views (select * from (select * from (select * from test))).
@history_1135_li
@history_1136_li
#The new view implementation did not work with < and <= comparison, and did not allow conditions on aggregates or grouped columns (HAVING). Fixed.. Fixed.
@history_1136_li
@history_1137_li
#Both view implementations did not work with multiple levels of nested temporary views (FROM (SELECT...)). Fixed.
@history_1137_li
@history_1138_li
#The H2 Console can now be run as a standalone web application, or it can be embedded as a servlet into any existing web application. To build the 'H2 Console' web application, execute 'ant warConsole'. See src/tools/org/h2/server/web and src/tools/WEB-INF for details. This web application has been tested with Tomcat and Jetty.
@history_1138_li
@history_1139_li
#Deleting database files didn't work for Windows if the database was on the root directory of a drive.
@history_1139_li
@history_1140_li
#The Polish translation is available. Thanks a lot to Tomek!
@history_1140_li
@history_1141_li
#Windows service: the CLASSPATH was not included when starting the service. Fixed.
@history_1141_h3
@history_1142_h3
#Version 1.0.50 (2007-06-17)
@history_1142_li
@history_1143_li
#File names starting with ~ are now in the user directory (Java system property user.home)
@history_1143_li
@history_1144_li
#New Console starter application uses the JDK 1.6 system tray functionality if available, or a simple AWT frame for other platforms. To try it out, execute java org.h2.tools.Console. Feedback is welcome. This console starter application is not the default yet, but the plan is to remove the SysTray tool in the future.
#If a Reader or InputStream of a LOB is not closed, the LOB can not be deleted (embedded mode only). The exception is typically 'Error while renaming file'). As a workaround, set the system property 'h2.lobCloseBetweenReads' to true to close the LOB files between read operations. However this slows down reading.
@history_1146_li
@history_1147_li
#Server mode: the server stack trace was included in SQLException messages. Fixed.
@history_1147_li
@history_1148_li
#Views support has been partially re-implemented. Views are up to 6 times faster. Compared to regular queries, only 20% overhead. Because this is a bigger change, it is not enabled by default. To enable it, set the system property 'h2.indexNew' to true (java -Dh2.indexNew=true ..., or in source code Constants.INDEX_NEW = true). If no problems are found, this will be enabled by default in the next release.
@history_1148_li
@history_1149_li
#In INSERT and MERGE statements, each column may only be specified once now.
@history_1149_li
@history_1150_li
#For most IOExceptions now the file name is included in the error message.
@history_1150_li
@history_1151_li
#A java.util.Date object is now converted to a TIMESTAMP in the JDBC API. Previously it was converted to a DATE.
@history_1151_li
@history_1152_li
#After calling SHUTDOWN and closing the connection and a superfluous error message appeared in the trace file. Fixed.
@history_1152_li
@history_1153_li
#In many situations, views did not use an index if they could have. Fixed. Also the explain plan for views works now.
@history_1153_li
@history_1154_li
#The table id (important for LOB files) is now included in INFORMATION_SCHEMA.TABLES.
@history_1154_li
@history_1155_li
#When using DISTINCT, ORDER BY a function works now as long as it is in the column list.
@history_1155_li
@history_1156_li
#Support for the data type CHAR. The difference to VARCHAR is: trailing spaces are ignored. This data type is supported for compatibility with other databases and older applications.
@history_1156_li
@history_1157_li
#The aggregate function COUNT(...) now returns a long instead of an int.
@history_1157_li
@history_1158_li
#The 'ordering' of data types was not always correct, for example an operation involving REAL and DOUBLE produced a result of type REAL. Fixed.
@history_1158_li
@history_1159_li
#CSV tool: If the same instance was used for reading and writing, the tool wrote the column names twice. Fixed.
@history_1159_li
@history_1160_li
#Compatibility: Support for the data type notation CHARACTER VARYING.
@history_1160_li
@history_1161_li
#Can now ORDER BY -1 (meaning order by first column, descending), and ORDER BY ? (parameterized column number).
@history_1161_li
@history_1162_li
#Databases with invalid linked tables (for example, because the target database is not accessible) can now be opened. Old table links don't work however.
@history_1162_li
@history_1163_li
#There was a small memory leak in the trace module. One object per opened connection was kept in a hash map.
@history_1163_li
@history_1164_li
#Linked tables can now emit UPDATE statements if 'EMIT UPDATES' is specified in the CREATE LINKED TABLE statement. So far, updating a row always deleted the old row and then inserted the new row.
@history_1164_li
@history_1165_li
#In the last release, the H2 Console opened two connection when logging into a database, and only closed one connection when logging out. Fixed.
@history_1165_li
@history_1166_li
#New functions LEAST and GREATEST to get the smallest or largest value from a list.
@history_1166_h3
@history_1167_h3
#Version 1.0.46 (2007-04-29)
@history_1167_li
@history_1168_li
#Unnamed private in-memory database (jdbc:h2:mem:) were not 'private' as documented. Fixed.
@history_1168_li
@history_1169_li
#Autocomplete in the Console application: now the result frame scrolls to the top when the list is updated.
@history_1169_li
@history_1170_li
#GROUP BY expressions did not work correctly in subqueries. Fixed.
@history_1170_li
@history_1171_li
#New function TABLE to define ad-hoc (temporary) tables in a query. This also solves problems with variable-size IN(...) queries: instead of SELECT * FROM TEST WHERE ID IN(?, ?, ...) you can now write: SELECT * FROM TABLE(ID INT=?) X, TEST WHERE X.ID=TEST.ID In this case, the index is used.
@history_1171_li
@history_1172_li
#New data type ARRAY. Actually it was there before, but is now documented and better tested (however it must still be considered experimental). The java.sql.Array implementation is incomplete, but setObject(1, new Object[]{...}) and getObject(..) can be used. New functions ARRAY_GET and ARRAY_LENGTH.
@history_1172_li
@history_1173_li
#SimpleResultSet now has some basic data type conversion features.
@history_1173_li
@history_1174_li
#When using JDK 1.5 or later, and switching on h2.lobFilesInDirectories, the performance for creating LOBs was bad. This has been fixed, however creating lots of LOBs it is still faster when the setting is switched off.
@history_1174_li
@history_1175_li
#A problem with multiple unnamed dynamic tables (FROM (SELECT...)) has been fixed.
@history_1175_li
@history_1176_li
#Appending 'Z' to a timestamp did not have an effect. Now it is interpreted as +00:00 (GMT).
@history_1176_li
@history_1177_li
#The BACKUP command is better tested and documented. This means hot backup (online backup) is now possible.
@history_1177_li
@history_1178_li
#The old 'Backup' tool is now called 'Script' (as the SQL statement).
@history_1178_li
@history_1179_li
#There are new 'Backup' and 'Restore' tools that work with database files directly.
@history_1179_li
@history_1180_li
#The complete syntax for referential and check constraints is now supported when written as part of the column definition, behind PRIMARY KEY.
@history_1180_li
@history_1181_li
#CASE WHEN ... returned the wrong result when the condition evaluated to NULL.
@history_1181_li
@history_1182_li
#The new function LINK_SCHEMA simplifies linking all tables of a schema.
@history_1182_li
@history_1183_li
#SCRIPT DROP now also drops aliases (Java functions) if they exist.
@history_1183_li
@history_1184_li
#For encrypted databases, the trace option can no longer be enabled manually by creating a file.
@history_1184_li
@history_1185_li
#For linked tables, NULL in the unique key is now supported.
@history_1185_li
@history_1186_li
#For read-only databases, temp files are now created in the default temp directory instead of the database directory.
@history_1186_li
@history_1187_li
#Sending CLOB data was slow in some systems when using the server version. Fixed.
@history_1187_li
@history_1188_li
#CSVWRITE now returns the number of rows written.
@history_1188_li
@history_1189_li
#The data type of NULLIF was NULL if the first expression was a column. Now the data type is set correctly.
@history_1189_li
@history_1190_li
#Indexes (and other related objects) for local temporary tables where not dropped when the session was closed. Fixed.
@history_1190_li
@history_1191_li
#ALTER TABLE did not work for tables with computed columns.
@history_1191_li
@history_1192_li
#SQLException.getCause of the now works for JDK 1.4 and higher.
@history_1192_li
@history_1193_li
#If the index file was deleted, an error was logged in the .trace.db file. This is no longer done.
@history_1193_li
@history_1194_li
#The Portuguese (Europe) translation is available. Thanks a lot to Antonio Casqueiro!
@history_1194_li
@history_1195_li
#The error message for invalid views has been improved (the root cause is included in the message now).
@history_1195_li
@history_1196_li
#IN(SELECT ...) was not working correctly if the subquery returned a NULL value. Fixed.
@history_1196_li
@history_1197_li
#DROP ALL OBJECTS did not drop constants.
@history_1197_li
@history_1198_li
#DROP ALL OBJECTS dropped the role PUBLIC, which was wrong. Fixed.
@history_1198_li
@history_1199_li
#CASE was parsed as a function if the expression was in (). Fixed.
@history_1199_li
@history_1200_li
#When ORDER BY was used together with DISTINCT, it was required to type the column name exactly in the select list and the order list exactly in the same way. This is not required any longer.
@history_1200_h3
@history_1201_h3
#Version 1.0.44 (2007-03-04)
@history_1201_li
@history_1202_li
#System sequences (automatically created sequences for IDENTITY or AUTO_INCREMENT columns) are now random (UUIDs) to avoid clashes when merging databases using RUNSCRIPT.
@history_1202_li
@history_1203_li
#The precision for linked tables was not correct for some data types, for example VARCHAR. Fixed.
@history_1203_li
@history_1204_li
#Many problems and bugs in the XA support (package javax.sql) have been fixed.
@history_1204_li
@history_1205_li
#Now the server tool (org.h2.tools.Server) terminates with an exit code if a problem occured.
@history_1205_li
@history_1206_li
#The JDBC driver is now loaded if the JdbcDataSource class is loaded.
@history_1206_li
@history_1207_li
#After renaming a user the password becomes invalid. This is now documented.
@history_1207_li
@history_1208_li
#XAResource.recover didn't work. Fixed.
@history_1208_li
@history_1209_li
#XAResource.recover did throw an exception with the code XAER_OUTSIDE if there was no connection. Now the code is XAER_RMERR.
@history_1209_li
@history_1210_li
#SCRIPT did not work correctly with BLOB or CLOB data. Fixed.
@history_1210_li
@history_1211_li
#BACKUP TO 'test.zip' now works with encrypted databases and CLOB and BLOB data.
@history_1211_li
@history_1212_li
#The function CASE WHEN ... didn't convert the returned value to the same data type, resulting in unexpected behavior in many cases. Fixed.
@history_1212_li
@history_1213_li
#Truncating a table is now allowed if the table references another table (but still not allowed if the table is references by another table).
@history_1213_li
@history_1214_li
#ORDER BY picked the wrong column if the same column name (but with a different table name) was used twice in the select list.
@history_1214_li
@history_1215_li
#When a subquery was used in the select list of a query, and GROUP BY was used at the same time, a NullPointerException could occur. Fixed.
@history_1215_li
@history_1216_li
#ORDER BY did not work when DISTINCT was used at the same time in some situations. Fixed.
@history_1216_li
@history_1217_li
#When using IN(...) on a case insensitive column (VARCHAR_IGNORECASE), an incorrect optimization was made and the result was wrong sometimes.
@history_1217_h3
@history_1218_h3
#Version 1.0.41 (2007-01-30)
@history_1218_li
@history_1219_li
#Experimental online backup feature using the SQL statement BACKUP TO 'fileName'. This creates a backup in the form of a zip file. Unlike the SCRIPT TO command, the data tables are not locked.
@history_1219_li
@history_1220_li
#When using the server mode, temporary files for large LOB values are now deleted when the result set is closed. This also means that LOBs become unavailable after closing the result, however this is according to the specs.
@history_1220_li
@history_1221_li
#It was possible that SUM throws a class cast exception if the parameter was a conditional expression.
@history_1221_li
@history_1222_li
#Benchmark: Added a multi-client test case, BenchB (similar to TPC-B).
@history_1222_li
@history_1223_li
#Compatibility: SCHEMA_NAME.SEQUENCE_NAME.NEXTVAL now works as expected.
@history_1223_li
@history_1224_li
#The Console is now translated to Hungarian thanks to Andras Hideg, and to Indonesian thanks to Joko Yuliantoro
@history_1224_li
@history_1225_li
#XAConnection: A NullPointerException was thrown if addConnectionEventListener was called before opening the connection.
@history_1225_li
@history_1226_li
#In case the result set of a subquery was re-used, an exception was throws if the subquery result did not fit in memory. Now the result is not re-used in this case. Generally, large subqueries should be avoided for performance reasons.
@history_1226_li
@history_1227_li
#The command "drop all objects delete files" did not work on linux if the database name was lower case.
@history_1227_li
@history_1228_li
#When setting the URL to an empty string the DataSource now throws an better exception.
@history_1228_li
@history_1229_li
#Parsing of LIKE .. ESCAPE did not stop at the expected point. Fixed.
@history_1229_li
@history_1230_li
#Can now use UUID columns as generated key values. However, the UUID column must be the primary key.
@history_1230_li
@history_1231_li
#Improved the Javadoc documentation. Now unsupported features are marked with [Not supported], and partially supported features are [Partially supported].
@history_1231_li
@history_1232_li
#The forum subscriptions (the emails sent from the forum) now works.
@history_1232_h3
@history_1233_h3
#Version 1.0.40 (2007-01-17)
@history_1233_li
@history_1234_li
#Setting the collation (SET COLLATOR) was very slow on some systems (up to 24 seconds). Thanks a lot to Martina Nissler for finding this problem!
@history_1234_li
@history_1235_li
#The Console is now translated to Japanese thanks to IKEMOTO, Masahiro (ikeyan (at) arizona (dot) ne (dot) jp)
@history_1235_li
@history_1236_li
#The database engine can now be compiled with JDK 1.3 using ant codeswitch. There are still some limitations, and the ant script to build the jar does not work yet.
@history_1236_li
@history_1237_li
#Fixed a problem where data in the log file was not written to the data file (recovery failure) after a crash, if an index was deleted previously.
@history_1237_li
@history_1238_li
#SCRIPT NODATA now writes the row count for each table (this simplifies comparing databases).
@history_1238_li
@history_1239_li
#Selecting a column using the syntax schemaName.tableName.columnName did not work in all cases.
@history_1239_li
@history_1240_li
#Can now parse timestamps with timezone information (Z or +/-hh:mm) and dates before year 1. However dates before year 1 are not formatted correctly (this is a Java problem).
@history_1240_li
@history_1241_li
#When stopping the TCP server from an application and immediately afterwards staring it again using a different TCP password, an exception was thrown sometimes.
@history_1241_li
@history_1242_li
#Now PreparedStatement.setBigDecimal(..) can only be called with an object of type java.math.BigDecimal. Derived classes are not allowed any more. Many thanks to Maciej Wegorkiewicz for finding this problem.
@history_1242_li
@history_1243_li
#It was possible to manipulate values in the byte array after calling PreparedStatement.setBytes, and this could lead to problems if the same byte array was used again. Now the byte array is copied if required.
@history_1243_li
@history_1244_li
#Date, time and timestamp objects were cloned in cases where it was not required. Fixed.
@history_1244_h3
@history_1245_h3
#Version 1.0.36 (2007-01-02)
@history_1245_li
@history_1246_li
#It was possible to drop the sequence of a temporary tables with DROP ALL OBJECTS, resulting in a null pointer exception afterwards.
@history_1246_li
@history_1247_li
#Prepared statements with non-constant functions such as CURRENT_TIMESTAMP() did not get re-evaluated if the result of the function changed. Fixed.
@history_1247_li
@history_1248_li
#The (relative or absolute) directory where the script files are stored or read can now be changed using the system property h2.scriptDirectory
@history_1248_li
@history_1249_li
#Client trace files now created in the directory 'trace.db' and no longer the application directory. This can be changed using the system property h2.clientTraceDirectory.
@history_1249_li
@history_1250_li
#In some situations the log file got corrupt if the process was terminated while the database was opening.
@history_1250_li
@history_1251_li
#Using ;RECOVER=1 in the database URL threw a syntax exception. Fixed.
@history_1251_li
@history_1252_li
#If a CLOB or BLOB was deleted in a transaction and the database crashed before the transaction was committed or rolled back, the object was lost if it was large. Fixed.
@history_1252_li
@history_1253_li
#Now using ant-build.properties. The jdk is automatically updated when using ant codeswitch...
@history_1253_li
@history_1254_li
#Cluster: Now the server can detect if a query is read-only, and in this case the result is only read from the first cluster node. However, there is currently no load balancing made to avoid problems with transactions / locking.
@history_1254_li
@history_1255_li
#Many settings are now initialized from system properties and can be changed on the command line without having recompile the database. See Advances / Settings Read from System Properties.
@history_1255_li
@history_1256_li
#H2 is now available in Maven. The groupId is com.h2database, the artifactId h2 and the version 1.0.20061217. To create the maven artifacts yourself, use 'ant mavenUploadLocal' and 'ant mavenBuildCentral'.
@history_1256_h3
@history_1257_h3
#Version 1.0.25 (2006-08-31)
@history_1257_li
@history_1258_li
#In some situations, wide b-tree indexes (with large VARCHAR columns for example) could get corrupted. Fixed.
@history_1258_li
@history_1259_li
#ORDER BY was broken in the last release when using table aliases. Fixed.
@history_1259_h3
@history_1260_h3
#Version 0.9 (2005-12-13)
@history_1260_li
@history_1261_li
#First public release.
@history_1261_h2
@history_1262_h2
#Roadmap
@history_1262_h3
@history_1263_h3
#Highest Priority
@history_1263_li
@history_1264_li
#Improve test code coverage
@history_1264_li
@history_1265_li
#More fuzz tests
@history_1265_li
@history_1266_li
#Test very large databases and LOBs (up to 256 GB)
@history_1266_li
@history_1267_li
#Test multi-threaded in-memory db access
@history_1267_h3
@history_1268_h3
#In Version 1.1
@history_1268_li
@history_1269_li
#Add version number. Install directory: h2-1.0, jar file: h2-1.0.jar. Micro version: use build number, staring with 1.1.100
@history_1269_li
@history_1270_li
#Automatic upgrade if there is a file format change
@history_1270_li
@history_1271_li
#ALTER TABLE on a table with a LOB could result in 'Cannot delete file' on some systems. Fixed.
@history_1271_li
@history_1272_li
#Change Constants.DEFAULT_MAX_MEMORY_UNDO to 10000 (and change the docs). Test.
@history_1272_li
@history_1273_li
#Enable and document optimizations, LOB files in directories
@history_1273_li
@history_1274_li
#Special methods for DataPage.writeByte / writeShort and so on
@history_1274_li
@history_1275_li
#Index organized tables CREATE TABLE...(...) ORGANIZATION INDEX (store in data file) (probably file format changes are required for rowId)
@history_1275_li
@history_1276_li
#Change the default for NULL || 'x' to NULL
@history_1276_h3
@history_1277_h3
#Priority 1
@history_1277_li
#MVCC (Multi Version Concurrency Control)
@history_1278_li
#Read-only databases inside a jar (splitting large files to speed up random access)
#MVCC (Multi Version Concurrency Control)
@history_1279_li
#RECOVER=1 should automatically recover, =2 should run the recovery tool if required
#Read-only databases inside a jar (splitting large files to speed up random access)
@history_1280_li
#More tests with MULTI_THREADED=1
#RECOVER=1 should automatically recover, =2 should run the recovery tool if required
@history_1281_li
#Improve performance for create table (if this is possible)
#More tests with MULTI_THREADED=1
@history_1282_li
#Test with Spatial DB in a box / JTS (http://docs.codehaus.org/display/GEOS/SpatialDBBox)
...
...
@@ -3815,712 +3806,712 @@ Mit Maven 2
#Compression of the cache
@history_1349_li
#Run H2 Console inside servlet (pass-through servlet of fix the JSP / app)
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
@history_1350_li
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
#Make the jar more modular
@history_1351_li
#Make the jar more modular
#Drop with restrict (currently cascade is the default)
@history_1352_li
#Drop with restrict (currently cascade is the default)
#JSON parser and functions
@history_1353_li
#JSON parser and functions
#Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
@history_1354_li
#Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
#Automatic collection of statistics (auto ANALYZE)
@history_1355_li
#Automatic collection of statistics (auto ANALYZE)
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
@history_1356_li
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
#Copy database: Tool with config GUI and batch mode, extensible (example: compare)
@history_1357_li
#Copy database: Tool with config GUI and batch mode, extensible (example: compare)
#Document, implement tool for long running transactions using user defined compensation statements
@history_1358_li
#Document, implement tool for long running transactions using user defined compensation statements
#Support SET TABLE DUAL READONLY
@history_1359_li
#Support SET TABLE DUAL READONLY
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
@history_1360_li
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
#Don't write stack traces for common exceptions like duplicate key to the log by default
@history_1361_li
#Don't write stack traces for common exceptions like duplicate key to the log by default
#Setting for MAX_QUERY_TIME (default no limit?)
@history_1362_li
#Setting for MAX_QUERY_TIME (default no limit?)
#GCJ: what is the state now?
@history_1363_li
#GCJ: what is the state now?
#Convert large byte[]/Strings to streams in the JDBC API (asap).
@history_1364_li
#Convert large byte[]/Strings to streams in the JDBC API (asap).
#Use Janino to convert Java to C++
@history_1365_li
#Use Janino to convert Java to C++
#Reduce disk space usage (Derby uses less disk space?)
@history_1366_li
#Reduce disk space usage (Derby uses less disk space?)
#Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
@history_1367_li
#Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
#Optimization: Log compression
@history_1368_li
#Optimization: Log compression
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
@history_1369_li
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
@history_1370_li
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
#Custom class loader to reload functions on demand
@history_1371_li
#Custom class loader to reload functions on demand
#Test http://mysql-je.sourceforge.net/
@history_1372_li
#Test http://mysql-je.sourceforge.net/
#Close all files when closing the database (including LOB files that are open on the client side)
@history_1373_li
#Close all files when closing the database (including LOB files that are open on the client side)
#Test Connection Pool http://jakarta.apache.org/commons/dbcp
@history_1374_li
#Test Connection Pool http://jakarta.apache.org/commons/dbcp
#Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
@history_1375_li
#Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
#Function to read/write a file from/to LOB
@history_1376_li
#Function to read/write a file from/to LOB
#Allow custom settings (@PATH for RUNSCRIPT for example)
@history_1377_li
#Allow custom settings (@PATH for RUNSCRIPT for example)
#Performance test: read the data (getString) and use column names to get the data
@history_1378_li
#Performance test: read the data (getString) and use column names to get the data
#EXE file: maybe use http://jsmooth.sourceforge.net
@history_1379_li
#EXE file: maybe use http://jsmooth.sourceforge.net
#SELECT ... FOR READ WAIT [maxMillisToWait]
@history_1380_li
#SELECT ... FOR READ WAIT [maxMillisToWait]
#Automatically delete the index file if opening it fails
@history_1381_li
#Automatically delete the index file if opening it fails
#Performance: Automatically build in-memory indexes if the whole table is in memory
@history_1382_li
#Performance: Automatically build in-memory indexes if the whole table is in memory
#H2 Console: The webclient could support more features like phpMyAdmin.
@history_1383_li
#H2 Console: The webclient could support more features like phpMyAdmin.
#The HELP information schema can be directly exposed in the Console
@history_1384_li
#The HELP information schema can be directly exposed in the Console
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
@history_1385_li
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@history_1431_li
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
#Functions with unknown return or parameter data types: serialize / deserialize
@history_1432_li
#Functions with unknown return or parameter data types: serialize / deserialize
#Test if idle TCP connections are closed, and how to disable that
@history_1433_li
#Test if idle TCP connections are closed, and how to disable that
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
@history_1434_li
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
#Auto-Update feature for database, .jar file
@history_1435_li
#Auto-Update feature for database, .jar file
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
@history_1436_li
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
#RANK() and DENSE_RANK(), Partition using OVER()
@history_1437_li
#RANK() and DENSE_RANK(), Partition using OVER()
#ROW_NUMBER (not the same as ROWNUM)
@history_1438_li
#ROW_NUMBER (not the same as ROWNUM)
#Partial indexing (see PostgreSQL)
@history_1439_li
#Partial indexing (see PostgreSQL)
#BUILD should fail if ant test fails
@history_1440_li
#BUILD should fail if ant test fails
#http://rubyforge.org/projects/hypersonic/
@history_1441_li
#http://rubyforge.org/projects/hypersonic/
#DbVisualizer profile for H2
@history_1442_li
#DbVisualizer profile for H2
#Add comparator (x === y) : (x = y or (x is null and y is null))
@history_1443_li
#Add comparator (x === y) : (x = y or (x is null and y is null))
#Try to create trace file even for read only databases
@history_1444_li
#Try to create trace file even for read only databases
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
@history_1445_li
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
#Count on a column that can not be null would be optimized to COUNT(*)
@history_1446_li
#Count on a column that can not be null would be optimized to COUNT(*)
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
@history_1447_li
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
#Backup tool should work with other databases as well
@history_1448_li
#Backup tool should work with other databases as well
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
@history_1449_li
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
#Maybe use Fowler Noll Vo hash function
@history_1450_li
#Maybe use Fowler Noll Vo hash function
#Improved full text search (supports LOBs, reader / tokenizer / filter).
@history_1451_li
#Improved full text search (supports LOBs, reader / tokenizer / filter).
#Performance: Update in-place
@history_1452_li
#Performance: Update in-place
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
@history_1453_li
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@history_1536_li
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
#Support multiple directories (on different hard drives) for the same database
@history_1537_li
#Support multiple directories (on different hard drives) for the same database
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@history_1538_li
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@history_1539_li
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
#GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
@history_1540_li
#GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
#Support native XML data type
@history_1541_li
#Support native XML data type
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
@history_1542_li
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@history_1543_li
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
#Support materialized views (using triggers)
@history_1544_li
#Support materialized views (using triggers)
#Store dates in local timezone (portability of database files)
@history_1545_li
#Store dates in local timezone (portability of database files)
#Ability to resize the cache array when resizing the cache
@history_1546_li
#Ability to resize the cache array when resizing the cache
#Automatic conversion from WHERE X>10 AND X>20 to X>20
@history_1547_li
#Automatic conversion from WHERE X>10 AND X>20 to X>20
#Time based cache writing (one second after writing the log)
@history_1548_li
#Time based cache writing (one second after writing the log)
#Write a H2 driver for http://db.apache.org/ddlutils/
@history_1549_li
#Write a H2 driver for http://db.apache.org/ddlutils/
#Index usage for REGEXP LIKE.
@history_1550_li
#Index usage for REGEXP LIKE.
#Add a role DBA (like ADMIN).
@history_1551_li
#Add a role DBA (like ADMIN).
#Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
@history_1552_li
#Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
@history_1553_li
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
#Implement INSTEAD OF trigger.
@history_1554_li
#Implement INSTEAD OF trigger.
#Access rights: Finer grained access control (grant access for specific functions)
@history_1555_li
#Access rights: Finer grained access control (grant access for specific functions)
#Support N'text'
@history_1556_li
#Support N'text'
#Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
@history_1557_li
#Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
#Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
@history_1558_li
#Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
#Set a connection read only (Connection.setReadOnly)
@history_1559_li
#Set a connection read only (Connection.setReadOnly)
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@history_1560_li
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@history_1561_li
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
#Read-only sessions (Connection.setReadOnly)
@history_1562_li
#Read-only sessions (Connection.setReadOnly)
#Support compatibility for jdbc:hsqldb:res:
@history_1563_li
#Support compatibility for jdbc:hsqldb:res:
#In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@history_1564_li
#In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
#Provide a simple, lightweight O/R mapping tool
@history_1565_li
#Provide a simple, lightweight O/R mapping tool
#Provide an Java SQL builder with standard and H2 syntax
@history_1566_li
#Provide an Java SQL builder with standard and H2 syntax
#Data compression for in-memory database
@history_1567_li
#Data compression for in-memory database
#Trace: write os, file system, vm,... when opening the database
@history_1568_li
#Trace: write os, file system, vm,... when opening the database
#Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
@history_1569_li
#Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
#ParameterMetaData should return correct data type where possible (INSERT for example)
@history_1570_li
#ParameterMetaData should return correct data type where possible (INSERT for example)
#Support indexes for views (probably requires materialized views)
@history_1571_li
#Support indexes for views (probably requires materialized views)
#Linked tables that point to the same database should share the connection
@history_1572_li
#Linked tables that point to the same database should share the connection
#Use log for rollback
@history_1573_li
#Use log for rollback
#Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
@history_1574_li
#Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
#Complete Javadocs for ErrorCode messages and add to docs
@history_1575_li
#Complete Javadocs for ErrorCode messages and add to docs
#Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
@history_1576_li
#Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
#Document org.h2.samples.MixedMode
@history_1577_li
#Document org.h2.samples.MixedMode
#Server: use one listener (detect if the request comes from an PG or TCP client)
@history_1578_li
#Server: use one listener (detect if the request comes from an PG or TCP client)
#Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
@history_1579_li
#Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
#Support data type INTERVAL
@history_1580_li
#Support data type INTERVAL
#NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
@history_1581_li
#NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
#Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
@history_1582_li
#Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
#Support setQueryTimeout (using System.currentTimeMillis in a loop; not using a thread)
@history_1584_li
#Support setQueryTimeout (using System.currentTimeMillis in a loop; not using a thread)
#Support large updates and deletes (currently all rows are loaded into memory)
@history_1585_h3
#Not Planned
...
...
@@ -5021,7 +5012,7 @@ Mit Maven 2
#Download
@mainWeb_1007_td
#Version 1.0.59 (2007-10-03):
#Version 1.0.60 (2007-10-20):
@mainWeb_1008_a
#Windows Installer (2.7 MB)
...
...
@@ -6913,3 +6904,120 @@ Kompilieren
@tutorial_1144_p
#You can also call the index from within a Java application:
@~download_1006_a
#Platform-Independent Zip
@~download_1007_h3
#Download Mirror
@~download_1008_a
#Platform-Independent Zip
@~download_1009_h3
#Subversion Source Repository
@~download_1010_a
#Google Code
@~download_1011_p
#For details about changes, see the <a href="history.html">Change Log</a> .
@~history_1020_h3
#Version 1.0.59 (2007-10-03)
@~history_1021_li
#When the data type was unknown in a subquery, sometimes the wrong exception (ArrayIndexOutOfBounds) was thrown. Fixed.
@~history_1036_h3
#Version 1.0.58 (2007-09-15)
@~history_1037_li
#System.exit is no longer called by the WebServer, the Console and the Server tool (except to set the exit code if required). This is important when using OSGi.
@~history_1061_h3
#Version 1.0.57 (2007-08-25)
@~history_1062_li
#New experimental feature MVCC (multi version concurrency control). Can be set as a option when opening the database (jdbc:h2:test;MVCC=TRUE) or as a system property (-Dh2.mvcc=true). This is work-in-progress, use it at your own risk. Feedback is welcome.
@~history_1088_h3
#Version 1.0.56 (2007-08-02)
@~history_1089_li
#A new tool to help translation has been implemented: src/tools/org/h2/tools/i18n/PrepareTranslation. This tool can detect delta changes in the original (English) and prepends '#' in translation if the original text was changed. It can also extract text from the user documentation (however, it is incomplete).
@~history_1115_h3
#Version 1.0.55 (2007-07-12)
@~history_1116_li
#Support for the system property baseDir. This works for embedded databases as well. The setting is supported by the H2 Console using -Dh2.baseDir or -baseDir
@~history_1141_h3
#Version 1.0.50 (2007-06-17)
@~history_1142_li
#File names starting with ~ are now in the user directory (Java system property user.home)
@~history_1166_h3
#Version 1.0.46 (2007-04-29)
@~history_1167_li
#Unnamed private in-memory database (jdbc:h2:mem:) were not 'private' as documented. Fixed.
@~history_1200_h3
#Version 1.0.44 (2007-03-04)
@~history_1201_li
#System sequences (automatically created sequences for IDENTITY or AUTO_INCREMENT columns) are now random (UUIDs) to avoid clashes when merging databases using RUNSCRIPT.
@~history_1217_h3
#Version 1.0.41 (2007-01-30)
@~history_1218_li
#Experimental online backup feature using the SQL statement BACKUP TO 'fileName'. This creates a backup in the form of a zip file. Unlike the SCRIPT TO command, the data tables are not locked.
@~history_1232_h3
#Version 1.0.40 (2007-01-17)
@~history_1233_li
#Setting the collation (SET COLLATOR) was very slow on some systems (up to 24 seconds). Thanks a lot to Martina Nissler for finding this problem!
@~history_1244_h3
#Version 1.0.36 (2007-01-02)
@~history_1245_li
#It was possible to drop the sequence of a temporary tables with DROP ALL OBJECTS, resulting in a null pointer exception afterwards.
@~history_1256_h3
#Version 1.0.25 (2006-08-31)
@~history_1257_li
#In some situations, wide b-tree indexes (with large VARCHAR columns for example) could get corrupted. Fixed.
@~history_1259_h3
#Version 0.9 (2005-12-13)
@~history_1260_li
#First public release.
@~history_1261_h2
#Roadmap
@~history_1262_h3
#Highest Priority
@~history_1263_li
#Improve test code coverage
@~history_1267_h3
#In Version 1.1
@~history_1268_li
#Add version number. Install directory: h2-1.0, jar file: h2-1.0.jar. Micro version: use build number, staring with 1.1.100
@@ -1124,7 +1124,7 @@ Afterwards, you can include the database in your Maven 2 project as a dependency
Downloads
@download_1001_h3
Version 1.0.58 (2007-09-15, Current)
Version 1.0.60 (2007-10-20, Current)
@download_1002_a
Windows Installer
...
...
@@ -1133,27 +1133,18 @@ Windows Installer
Platform-Independent Zip
@download_1004_h3
Version 1.0 / 2007-03-04 (Last Stable)
@download_1005_a
Windows Installer
@download_1006_a
Platform-Independent Zip
@download_1007_h3
Download Mirror
@download_1008_a
@download_1005_a
Platform-Independent Zip
@download_1009_h3
@download_1006_h3
Subversion Source Repository
@download_1010_a
@download_1007_a
Google Code
@download_1011_p
@download_1008_p
For details about changes, see the <a href="history.html">Change Log</a> .
@faq_1000_h1
...
...
@@ -1193,7 +1184,7 @@ How to Translate this Project?
Are there any known bugs? When is the next release?
@faq_1012_p
Usually, bugs get fixes as they are found. There is a release every few weeks. Here is the list of known and confirmed issues as of 2007-10-03:
Usually, bugs get fixes as they are found. There is a release every few weeks. Here is the list of known and confirmed issues as of 2007-10-20:
@faq_1013_li
Some problems have been found with right outer join. Internally, it is converted to left outer join, which does not always produce the same results as other databases when used in combination with other joins.
...
...
@@ -2798,820 +2789,820 @@ Version 1.0 (Current)
Version 1.0.60 (2007-10-?)
@history_1010_li
User defined aggregate functions are not supported.
JdbcXAConnection: starting a transaction before getting the connection didn't switch off autocommit.
@history_1011_li
Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
User defined aggregate functions are not supported.
@history_1012_li
Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
@history_1013_li
Linked tables: now tables in non-default schemas are supported as well
Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
@history_1014_li
New Italian translation from PierPaolo Ucchino. Thanks a lot!
Linked tables: now tables in non-default schemas are supported as well
@history_1015_li
CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods.
New Italian translation from PierPaolo Ucchino. Thanks a lot!
@history_1016_li
Prepared statements could not be used after data definition statements (creating tables and so on). Fixed.
CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods.
@history_1017_li
PreparedStatement.setMaxRows could not be changed to a higher value after the statement was executed.
Prepared statements could not be used after data definition statements (creating tables and so on). Fixed.
@history_1018_li
The H2 Console could not connect twice to the same H2 embedded database at the same time. Fixed.
PreparedStatement.setMaxRows could not be changed to a higher value after the statement was executed.
@history_1019_li
The H2 Console could not connect twice to the same H2 embedded database at the same time. Fixed.
@history_1020_li
CSVREAD, RUNSCRIPT and so on now support URLs as well, using URL.openStream(). Example: select * from csvread('jar:file:///c:/temp/test.jar!/test.csv');
@history_1020_h3
@history_1021_h3
Version 1.0.59 (2007-10-03)
@history_1021_li
@history_1022_li
When the data type was unknown in a subquery, sometimes the wrong exception (ArrayIndexOutOfBounds) was thrown. Fixed.
@history_1022_li
@history_1023_li
If the process was killed while the database was running, sometimes the database could not be opened ('double allocation') except when the system property h2.check was set to false. Fixed.
@history_1023_li
@history_1024_li
Multi-threaded kernel (MULTI_THREADED=1): A synchronization problem has been fixed.
@history_1024_li
@history_1025_li
A PreparedStatement that was cancelled could not be reused. Fixed.
@history_1025_li
@history_1026_li
H2 Console: Progress information when logging into a H2 embedded database (useful when opening a database is slow).
@history_1026_li
@history_1027_li
When the database was closed while logging was disabled (LOG 0), re-opening the database was slow. Fixed.
@history_1027_li
@history_1028_li
Fulltext search is now documented (in the Tutorial).
@history_1028_li
@history_1029_li
The Console did not refresh the table list if the CREATE TABLE statement started with a comment. Fixed.
@history_1029_li
@history_1030_li
When creating a table using CREATE TABLE .. AS SELECT, the precision for some data types (for example VARCHAR) was set to the default precision. Fixed.
@history_1030_li
@history_1031_li
When using the (undocumented) in-memory file system (jdbc:h2:memFS:x or jdbc:h2:memLZF:x), and using multiple connections, a ConcurrentModificationException could occur. Fixed.
@history_1031_li
@history_1032_li
REGEXP compatibility: So far String.matches was used, but for compatibility with MySQL, now Matcher.find is used.
@history_1032_li
@history_1033_li
SCRIPT: the SQL statements in the result set now include the terminating semicolon as well. Simplifies copy and paste.
@history_1033_li
@history_1034_li
When using a subquery with group by as a table, some columns could not be used in the where condition in the outer query. Example: SELECT * FROM (SELECT ID, COUNT(*) C FROM TEST) WHERE C > 100. Fixed.
@history_1034_li
@history_1035_li
Views with subqueries as tables and queries with nested subqueries as tables did not always work. Fixed.
@history_1035_li
@history_1036_li
Compatibility: comparing columns with constants that are out of range does not throw an exception.
@history_1036_h3
@history_1037_h3
Version 1.0.58 (2007-09-15)
@history_1037_li
@history_1038_li
System.exit is no longer called by the WebServer, the Console and the Server tool (except to set the exit code if required). This is important when using OSGi.
@history_1038_li
@history_1039_li
Optimization for independent subqueries. For example, this query can now an index: SELECT * FROM TEST WHERE ID = (SELECT MAX(ID) FROM TEST) This can be disabled by setting the system property h2.optimizeSubqueryCache to false.
@history_1039_li
@history_1040_li
The explain plan now says: /* direct lookup query */ if the query can be processed directly without reading rows, for example when using MIN(indexed column), MAX(indexed column), or COUNT(*).
@history_1040_li
@history_1041_li
When using IFNULL, NULLIF, COALESCE, LEAST, or GREATEST, and the first parameter was ?, an exception was thrown. Now the highest data type of all parameters is used.
@history_1041_li
@history_1042_li
When comparing TINYINT or SMALLINT columns against constants, the index was not used. Fixed.
@history_1042_li
@history_1043_li
Maven 2: new version are now automatically synced with the central repositories.
@history_1043_li
@history_1044_li
The default value for MAX_MEMORY_UNDO is now 100000.
@history_1044_li
@history_1045_li
The documentation indexer does no longer index Japanese pages. If somebody knows how to split Japanese into words please post it.
@history_1045_li
@history_1046_li
Oracle compatibility: SYSDATE now returns a timestamp. CHR(..) is now an alias for CHAR(..).
@history_1046_li
@history_1047_li
After deleting data, empty space in the database files was not efficiently reused (but it was reused when opening the database). This has been fixed.
@history_1047_li
@history_1048_li
About 230 bytes per database was leaked. This is a problem for applications opening and closing many thousand databases. The main problem: a shutdown hook was added but never removed. Fixed. In JDK 1.4, there is an additionally problem, see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4197876. A workaround has been implemented.
@history_1048_li
@history_1049_li
Optimization for COLUMN IN(.., NULL) if the column does not allow NULL values.
@history_1049_li
@history_1050_li
Using spaces in column and table aliases was not supported when used inside a view or temporary view.
@history_1050_li
@history_1051_li
The version (build) number is now included in the manifest file.
@history_1051_li
@history_1052_li
In some systems, SecureRandom.generateSeed is very slow (taking one minute or more). For those cases, an alternative method is used that takes less than one second.
@history_1052_li
@history_1053_li
The database file sizes are now increased at most 32 MB at any time.
@history_1053_li
@history_1054_li
New method DatabaseEventListener.opened that is called just after opening a database.
@history_1054_li
@history_1055_li
When using the Console with Internet Explorer 6.0 or 7.0, a Javascript error was thrown after clearing the query.
@history_1055_li
@history_1056_li
A database can now be opened even if class of a user defined function is not in the classpath. Trying to call the function will throws an exception.
@history_1056_li
@history_1057_li
User defined functions and constants may not overload built-in functions and constants. This didn't work before, but now trying to create such an object will fail.
@history_1057_li
@history_1058_li
Improved MultiDimension tool (for spatial queries): in the last few releases the tool was actually slower than using a regular query (because index lookup got faster, and because the tool didn't support prepared statements) Now the tool generates prepared statements, and the performance is better again (about 5 times faster for a reasonable amount of data).
@history_1058_li
@history_1059_li
Adding a foreign key or when re-enabling referential integrity for a table failed when checking was enabled and the reference contained NULL.
@history_1059_li
@history_1060_li
For PgServer, character encoding other than UTF-8 did not work correctly. Fixed.
@history_1060_li
@history_1061_li
Using a function in a GROUP BY expression that is used in a view as a condition did not always work.
@history_1061_h3
@history_1062_h3
Version 1.0.57 (2007-08-25)
@history_1062_li
@history_1063_li
New experimental feature MVCC (multi version concurrency control). Can be set as a option when opening the database (jdbc:h2:test;MVCC=TRUE) or as a system property (-Dh2.mvcc=true). This is work-in-progress, use it at your own risk. Feedback is welcome.
@history_1063_li
@history_1064_li
The version number is now major.minor.micro where micro is the build number. Not all version are public, so there may be gaps in the micro. The minor changes when there is a file format change.
@history_1064_li
@history_1065_li
The backup tool (org.h2.tools.Backup) did not work. The restore tool did not work when the -db parameter was used. Fixed. The documentation of the backup tool has been changed: only one database may be backed up at any time.
@history_1065_li
@history_1066_li
Opening large read-only databases was very slow. Fixed.
@history_1066_li
@history_1067_li
New Japanese translation of the error messages thanks to Ikemoto Masahiro. Thanks a lot!
@history_1067_li
@history_1068_li
Disabling / enabling referential integrity for a table can now be used inside a transaction.
@history_1068_li
@history_1069_li
Rights checking for dynamic tables (SELECT * FROM (SELECT ...)) did not work. Fixed.
@history_1069_li
@history_1070_li
Creating more than 10 views that depend on each other was very slow. Reconnecting was slow as well. Fixed.
@history_1070_li
@history_1071_li
When used as as Servlet, the H2 Console did not work with SSL (using Tomcat). Fixed.
@history_1071_li
@history_1072_li
When altering a table with foreign key constraint, if there was no manual index created for the referenced columns, the automatically created index was dropped while still being used. Fixed.
@history_1072_li
@history_1073_li
Check and foreign key constraints now checks if the existing data is consistent (this can be disabled by appending NOCHECK). It is also possible to check existing data when re-enabling referential integrity for a table.
@history_1073_li
@history_1074_li
Some unit tests failed on Linux because the file system works differently. The unit tests are fixed and should work now.
@history_1074_li
@history_1075_li
Can now incrementally translate the documentation. See also FAQ.
@history_1075_li
@history_1076_li
Improved error messages: some tools can't show the root cause of an exception. Adding the message of the root cause to the message of the thrown exception now where it makes sense.
@history_1076_li
@history_1077_li
The H2 Console can now connect to databases using JNDI. The driver class name must be a javax.naming.Context, (for example javax.naming.InitialContext), and the URL the resource name (for example java:comp/env/jdbc/Test). This should also work for linked tables.
@history_1077_li
@history_1078_li
Google translate did not work for the H2 homepage. It should be fixed now.
@history_1078_li
@history_1079_li
The CONVERT function did not work with views when using UNION.
@history_1079_li
@history_1080_li
The build now issues a warning if the source code is switched to the wrong version.
@history_1080_li
@history_1081_li
The default lock mode is now read committed instead of serialized.
@history_1081_li
@history_1082_li
PG server: data was truncated when reading large VARCHAR columns and decimal columns.
@history_1082_li
@history_1083_li
PG server: when the same database was accessed multiple times using the PostgreSQL ODBC driver, the pg_catalog schema update failed, and connecting to the database was not possible. Fixed.
@history_1083_li
@history_1084_li
Some file operations didn't work for files in the root directory. Fixed.
@history_1084_li
@history_1085_li
In the Restore tool, the parameter -file did not work. Fixed.
@history_1085_li
@history_1086_li
Two-phase commit: commit with transaction name was only supported in the recovery scan. Now it is always supported.
@history_1086_li
@history_1087_li
The column name C_CURRENT_TIMESTAMP did not work in the last release.
@history_1087_li
@history_1088_li
OpenOffice compatibility: support database name in column names.
@history_1088_h3
@history_1089_h3
Version 1.0.56 (2007-08-02)
@history_1089_li
@history_1090_li
A new tool to help translation has been implemented: src/tools/org/h2/tools/i18n/PrepareTranslation. This tool can detect delta changes in the original (English) and prepends '#' in translation if the original text was changed. It can also extract text from the user documentation (however, it is incomplete).
@history_1090_li
@history_1091_li
The error messages (src/main/org/h2/res/_*.*) can now be translated.
@history_1091_li
@history_1092_li
Part of the documentation has been translated to Japanese by Yusuke Fukushima.
@history_1092_li
@history_1093_li
Some Unicode characters where not supported as identifier name. Thanks Yusuke Fukushima for reporting this problem.
@history_1093_li
@history_1094_li
The default value DEFAULT_MAX_LENGTH_INPLACE_LOB has been changed from 128 to 1024.
@history_1094_li
@history_1095_li
A server that implements the PostgreSQL protocol is now included and documented. That means, the PostgreSQL ODBC driver can be used to access a H2 database. See in the documentation for details.
@history_1095_li
@history_1096_li
The experimental H2 ODBC driver has been removed.
@history_1096_li
@history_1097_li
The default value for h2.defaultMaxMemoryUndo is now 50000. This avoids out of memory problems when using large transactions, however large transactions are slower because they are buffered to disk. To disable, use -Dh2.defaultMaxMemoryUndo=2000000000.
@history_1097_li
@history_1098_li
Support for regular expression function REGEXP_REPLACE(expression, regex, replacement) and regular expression LIKE: expression REGEXP matchExpression. However, indexes are not yet used.
@history_1098_li
@history_1099_li
The old view implementation has been removed.
@history_1099_li
@history_1100_li
The SysTray tool has been removed, because JDK 1.6 has native support for system tray icons. Use the Console tool (org.h2.tools.Console) automatically installs a system tray icon if JDK 1.6 is used.
@history_1100_li
@history_1101_li
H2 Console: In the last release, the shutdown button did not work. Fixed.
@history_1101_li
@history_1102_li
Referential integrity can now be disabled using SET REFERENTIAL_INTEGRITY FALSE. It can also be disable only for one table using ALTER TABLE SET REFERENTIAL_INTEGRITY FALSE.
@history_1102_li
@history_1103_li
The Backup and Restore tools, and the BACKUP command did not back up LOBs when h2.lobFilesInDirectories was enabled. Fixed.
@history_1103_li
@history_1104_li
Calculation of cache memory usage has been improved.
@history_1104_li
@history_1105_li
In some situations record were released too late from the cache. Fixed.
@history_1105_li
@history_1106_li
The cache size is now measured in KB instead of blocks of 128 byte.
@history_1106_li
@history_1107_li
CREATE TABLE ... AS SELECT now needs less memory. While inserting the rows, the undo log is temporarily disabled. This avoid out of memory problems when creating large tables.
@history_1107_li
@history_1108_li
The per session undo log can now be disabled. This setting is useful for bulk operations that don't need to be atomic, like bulk delete or update.
@history_1108_li
@history_1109_li
The database file could get corrupted when there was an OutOfMemoryException in the middle of inserting a row.
@history_1109_li
@history_1110_li
Optimization for WHERE NOT(...) and WHERE [NOT] booleanFlagColumn. This can be disabled using the system property h2.optimizeNot.
@history_1110_li
@history_1111_li
Optimization for conditions like WHERE A=B AND B=X (A=X is added). This often appears in joins. This can be disabled using the system property h2.optimizeTwoEquals.
@history_1111_li
@history_1112_li
Documentation: the source code in 'Compacting a Database' was incorrect. Fixed.
@history_1112_li
@history_1113_li
In the H2 Console, result sets could not be modified because the default result set type is now forward only. For H2, now uses scrollable result sets. Also for other databases, but only when the query starts with @EDIT.
@history_1113_li
@history_1114_li
Views using UNION did not work correctly. Fixed.
@history_1114_li
@history_1115_li
Function tables did not work with views and EXPLAIN. Fixed.
@history_1115_h3
@history_1116_h3
Version 1.0.55 (2007-07-12)
@history_1116_li
@history_1117_li
Support for the system property baseDir. This works for embedded databases as well. The setting is supported by the H2 Console using -Dh2.baseDir or -baseDir
@history_1117_li
@history_1118_li
LIKE ESCAPE did not work correctly if the pattern was % or _, followed by an escape character, followed by %. Fixed.
@history_1118_li
@history_1119_li
PostgreSQL compatibility: SET SEARCH_PATH, SERIAL, CURRENT_USER, E'text', $1.
@history_1119_li
@history_1120_li
In some situations, when many tables with LOB columns were modified (ALTER TABLE), large objects were deleted. Fixed.
@history_1120_li
@history_1121_li
CREATE TABLE AS SELECT .. UNION .. did not work. Fixed.
@history_1121_li
@history_1122_li
New column ID for INFORMATION_SCHEMA.INDEXES, SEQUENCES, USERS, ROLES, RIGHTS, FUNCTION_ALIASES, SCHEMATA, VIEWS, CONSTRAINTS, CONSTANTS, DOMAINS, TRIGGERS.
@history_1122_li
@history_1123_li
If large result sets (backed by a temporary file) where not closed, the file was not deleted. Now, the default result set type is FETCH_FORWARD. This means temp files are deleted automatically (without having to close the result set explicitly). But it also means ResultSet.beforeFirst can only be called for scrollable result sets. To create a scrollable result set, use Statement stat = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY).
@history_1123_li
@history_1124_li
PreparedStatement.getMetaData is now implemented.
@history_1124_li
@history_1125_li
Now PreparedStatement.setBigDecimal(..) can be called with an object of a derived class if the system property h2.allowBigDecimalExtensions is set to true.
@history_1125_li
@history_1126_li
The default database name in the documentation is now jdbc:h2:~/test. Like this, the database is stored in the user home directory (system property user.home). Of course storing the database in the current working directory (as in jdbc:h2:test) still works. Using the user directory avoids the problem that the database is not found if the application runs in another directory than the console.
@history_1126_li
@history_1127_li
The SQL statement SET ASSERT has been deprecated, because Constants.CHECK is now final. To disable assertions (and improve performance), the system property h2.check can be used. Executing SET ASSERT still works, but has no effect.
@history_1127_li
@history_1128_li
In the READ_COMMITTED mode, when the multi-threaded kernel is enabled, read locks are now acquired but released immediately after a query.
@history_1128_li
@history_1129_li
The default trace level for JdbcDataSourceFactory was DEBUG, so when using data sources a trace file was always created. Now the default trace level is ERROR, and the file is only created if necessary.
@history_1129_li
@history_1130_li
PooledConnection.getConnection took a long time if only one connection was open at any time. Fixed.
@history_1130_li
@history_1131_li
Referential integrity violation: Two different SQL states are now used for missing parent / existing child.
@history_1131_li
@history_1132_li
DatabaseEventListener.exceptionThrown has a new parameter: SQL
@history_1132_li
@history_1133_li
For compatibility reasons, the catalog name can now be used in queries: SELECT * FROM TESTDB.PUBLIC.TEST
@history_1133_li
@history_1134_li
If SHUTDOWN IMMEDIATELY was called, then the connection was not closed and the database opened from somebody else at the same time, in some cases this could result in errors with LOB files. Fixed.
@history_1134_li
@history_1135_li
The new view implementation is now enabled by default. To use the old implementation, set the system property 'h2.indexOld' to true (java -Dh2.indexOld=true ..., or in source code Constants.INDEX_OLD = true). If no problems are found, the old implementation will be removed in the next release. The old implementation does not work with multi-level nested temporary views (select * from (select * from (select * from test))).
@history_1135_li
@history_1136_li
The new view implementation did not work with < and <= comparison, and did not allow conditions on aggregates or grouped columns (HAVING). Fixed.. Fixed.
@history_1136_li
@history_1137_li
Both view implementations did not work with multiple levels of nested temporary views (FROM (SELECT...)). Fixed.
@history_1137_li
@history_1138_li
The H2 Console can now be run as a standalone web application, or it can be embedded as a servlet into any existing web application. To build the 'H2 Console' web application, execute 'ant warConsole'. See src/tools/org/h2/server/web and src/tools/WEB-INF for details. This web application has been tested with Tomcat and Jetty.
@history_1138_li
@history_1139_li
Deleting database files didn't work for Windows if the database was on the root directory of a drive.
@history_1139_li
@history_1140_li
The Polish translation is available. Thanks a lot to Tomek!
@history_1140_li
@history_1141_li
Windows service: the CLASSPATH was not included when starting the service. Fixed.
@history_1141_h3
@history_1142_h3
Version 1.0.50 (2007-06-17)
@history_1142_li
@history_1143_li
File names starting with ~ are now in the user directory (Java system property user.home)
@history_1143_li
@history_1144_li
New Console starter application uses the JDK 1.6 system tray functionality if available, or a simple AWT frame for other platforms. To try it out, execute java org.h2.tools.Console. Feedback is welcome. This console starter application is not the default yet, but the plan is to remove the SysTray tool in the future.
@history_1144_li
@history_1145_li
New method Csv.write(Writer writer, ResultSet rs)
@history_1145_li
@history_1146_li
If a Reader or InputStream of a LOB is not closed, the LOB can not be deleted (embedded mode only). The exception is typically 'Error while renaming file'). As a workaround, set the system property 'h2.lobCloseBetweenReads' to true to close the LOB files between read operations. However this slows down reading.
@history_1146_li
@history_1147_li
Server mode: the server stack trace was included in SQLException messages. Fixed.
@history_1147_li
@history_1148_li
Views support has been partially re-implemented. Views are up to 6 times faster. Compared to regular queries, only 20% overhead. Because this is a bigger change, it is not enabled by default. To enable it, set the system property 'h2.indexNew' to true (java -Dh2.indexNew=true ..., or in source code Constants.INDEX_NEW = true). If no problems are found, this will be enabled by default in the next release.
@history_1148_li
@history_1149_li
In INSERT and MERGE statements, each column may only be specified once now.
@history_1149_li
@history_1150_li
For most IOExceptions now the file name is included in the error message.
@history_1150_li
@history_1151_li
A java.util.Date object is now converted to a TIMESTAMP in the JDBC API. Previously it was converted to a DATE.
@history_1151_li
@history_1152_li
After calling SHUTDOWN and closing the connection and a superfluous error message appeared in the trace file. Fixed.
@history_1152_li
@history_1153_li
In many situations, views did not use an index if they could have. Fixed. Also the explain plan for views works now.
@history_1153_li
@history_1154_li
The table id (important for LOB files) is now included in INFORMATION_SCHEMA.TABLES.
@history_1154_li
@history_1155_li
When using DISTINCT, ORDER BY a function works now as long as it is in the column list.
@history_1155_li
@history_1156_li
Support for the data type CHAR. The difference to VARCHAR is: trailing spaces are ignored. This data type is supported for compatibility with other databases and older applications.
@history_1156_li
@history_1157_li
The aggregate function COUNT(...) now returns a long instead of an int.
@history_1157_li
@history_1158_li
The 'ordering' of data types was not always correct, for example an operation involving REAL and DOUBLE produced a result of type REAL. Fixed.
@history_1158_li
@history_1159_li
CSV tool: If the same instance was used for reading and writing, the tool wrote the column names twice. Fixed.
@history_1159_li
@history_1160_li
Compatibility: Support for the data type notation CHARACTER VARYING.
@history_1160_li
@history_1161_li
Can now ORDER BY -1 (meaning order by first column, descending), and ORDER BY ? (parameterized column number).
@history_1161_li
@history_1162_li
Databases with invalid linked tables (for example, because the target database is not accessible) can now be opened. Old table links don't work however.
@history_1162_li
@history_1163_li
There was a small memory leak in the trace module. One object per opened connection was kept in a hash map.
@history_1163_li
@history_1164_li
Linked tables can now emit UPDATE statements if 'EMIT UPDATES' is specified in the CREATE LINKED TABLE statement. So far, updating a row always deleted the old row and then inserted the new row.
@history_1164_li
@history_1165_li
In the last release, the H2 Console opened two connection when logging into a database, and only closed one connection when logging out. Fixed.
@history_1165_li
@history_1166_li
New functions LEAST and GREATEST to get the smallest or largest value from a list.
@history_1166_h3
@history_1167_h3
Version 1.0.46 (2007-04-29)
@history_1167_li
@history_1168_li
Unnamed private in-memory database (jdbc:h2:mem:) were not 'private' as documented. Fixed.
@history_1168_li
@history_1169_li
Autocomplete in the Console application: now the result frame scrolls to the top when the list is updated.
@history_1169_li
@history_1170_li
GROUP BY expressions did not work correctly in subqueries. Fixed.
@history_1170_li
@history_1171_li
New function TABLE to define ad-hoc (temporary) tables in a query. This also solves problems with variable-size IN(...) queries: instead of SELECT * FROM TEST WHERE ID IN(?, ?, ...) you can now write: SELECT * FROM TABLE(ID INT=?) X, TEST WHERE X.ID=TEST.ID In this case, the index is used.
@history_1171_li
@history_1172_li
New data type ARRAY. Actually it was there before, but is now documented and better tested (however it must still be considered experimental). The java.sql.Array implementation is incomplete, but setObject(1, new Object[]{...}) and getObject(..) can be used. New functions ARRAY_GET and ARRAY_LENGTH.
@history_1172_li
@history_1173_li
SimpleResultSet now has some basic data type conversion features.
@history_1173_li
@history_1174_li
When using JDK 1.5 or later, and switching on h2.lobFilesInDirectories, the performance for creating LOBs was bad. This has been fixed, however creating lots of LOBs it is still faster when the setting is switched off.
@history_1174_li
@history_1175_li
A problem with multiple unnamed dynamic tables (FROM (SELECT...)) has been fixed.
@history_1175_li
@history_1176_li
Appending 'Z' to a timestamp did not have an effect. Now it is interpreted as +00:00 (GMT).
@history_1176_li
@history_1177_li
The BACKUP command is better tested and documented. This means hot backup (online backup) is now possible.
@history_1177_li
@history_1178_li
The old 'Backup' tool is now called 'Script' (as the SQL statement).
@history_1178_li
@history_1179_li
There are new 'Backup' and 'Restore' tools that work with database files directly.
@history_1179_li
@history_1180_li
The complete syntax for referential and check constraints is now supported when written as part of the column definition, behind PRIMARY KEY.
@history_1180_li
@history_1181_li
CASE WHEN ... returned the wrong result when the condition evaluated to NULL.
@history_1181_li
@history_1182_li
The new function LINK_SCHEMA simplifies linking all tables of a schema.
@history_1182_li
@history_1183_li
SCRIPT DROP now also drops aliases (Java functions) if they exist.
@history_1183_li
@history_1184_li
For encrypted databases, the trace option can no longer be enabled manually by creating a file.
@history_1184_li
@history_1185_li
For linked tables, NULL in the unique key is now supported.
@history_1185_li
@history_1186_li
For read-only databases, temp files are now created in the default temp directory instead of the database directory.
@history_1186_li
@history_1187_li
Sending CLOB data was slow in some systems when using the server version. Fixed.
@history_1187_li
@history_1188_li
CSVWRITE now returns the number of rows written.
@history_1188_li
@history_1189_li
The data type of NULLIF was NULL if the first expression was a column. Now the data type is set correctly.
@history_1189_li
@history_1190_li
Indexes (and other related objects) for local temporary tables where not dropped when the session was closed. Fixed.
@history_1190_li
@history_1191_li
ALTER TABLE did not work for tables with computed columns.
@history_1191_li
@history_1192_li
SQLException.getCause of the now works for JDK 1.4 and higher.
@history_1192_li
@history_1193_li
If the index file was deleted, an error was logged in the .trace.db file. This is no longer done.
@history_1193_li
@history_1194_li
The Portuguese (Europe) translation is available. Thanks a lot to Antonio Casqueiro!
@history_1194_li
@history_1195_li
The error message for invalid views has been improved (the root cause is included in the message now).
@history_1195_li
@history_1196_li
IN(SELECT ...) was not working correctly if the subquery returned a NULL value. Fixed.
@history_1196_li
@history_1197_li
DROP ALL OBJECTS did not drop constants.
@history_1197_li
@history_1198_li
DROP ALL OBJECTS dropped the role PUBLIC, which was wrong. Fixed.
@history_1198_li
@history_1199_li
CASE was parsed as a function if the expression was in (). Fixed.
@history_1199_li
@history_1200_li
When ORDER BY was used together with DISTINCT, it was required to type the column name exactly in the select list and the order list exactly in the same way. This is not required any longer.
@history_1200_h3
@history_1201_h3
Version 1.0.44 (2007-03-04)
@history_1201_li
@history_1202_li
System sequences (automatically created sequences for IDENTITY or AUTO_INCREMENT columns) are now random (UUIDs) to avoid clashes when merging databases using RUNSCRIPT.
@history_1202_li
@history_1203_li
The precision for linked tables was not correct for some data types, for example VARCHAR. Fixed.
@history_1203_li
@history_1204_li
Many problems and bugs in the XA support (package javax.sql) have been fixed.
@history_1204_li
@history_1205_li
Now the server tool (org.h2.tools.Server) terminates with an exit code if a problem occured.
@history_1205_li
@history_1206_li
The JDBC driver is now loaded if the JdbcDataSource class is loaded.
@history_1206_li
@history_1207_li
After renaming a user the password becomes invalid. This is now documented.
@history_1207_li
@history_1208_li
XAResource.recover didn't work. Fixed.
@history_1208_li
@history_1209_li
XAResource.recover did throw an exception with the code XAER_OUTSIDE if there was no connection. Now the code is XAER_RMERR.
@history_1209_li
@history_1210_li
SCRIPT did not work correctly with BLOB or CLOB data. Fixed.
@history_1210_li
@history_1211_li
BACKUP TO 'test.zip' now works with encrypted databases and CLOB and BLOB data.
@history_1211_li
@history_1212_li
The function CASE WHEN ... didn't convert the returned value to the same data type, resulting in unexpected behavior in many cases. Fixed.
@history_1212_li
@history_1213_li
Truncating a table is now allowed if the table references another table (but still not allowed if the table is references by another table).
@history_1213_li
@history_1214_li
ORDER BY picked the wrong column if the same column name (but with a different table name) was used twice in the select list.
@history_1214_li
@history_1215_li
When a subquery was used in the select list of a query, and GROUP BY was used at the same time, a NullPointerException could occur. Fixed.
@history_1215_li
@history_1216_li
ORDER BY did not work when DISTINCT was used at the same time in some situations. Fixed.
@history_1216_li
@history_1217_li
When using IN(...) on a case insensitive column (VARCHAR_IGNORECASE), an incorrect optimization was made and the result was wrong sometimes.
@history_1217_h3
@history_1218_h3
Version 1.0.41 (2007-01-30)
@history_1218_li
@history_1219_li
Experimental online backup feature using the SQL statement BACKUP TO 'fileName'. This creates a backup in the form of a zip file. Unlike the SCRIPT TO command, the data tables are not locked.
@history_1219_li
@history_1220_li
When using the server mode, temporary files for large LOB values are now deleted when the result set is closed. This also means that LOBs become unavailable after closing the result, however this is according to the specs.
@history_1220_li
@history_1221_li
It was possible that SUM throws a class cast exception if the parameter was a conditional expression.
@history_1221_li
@history_1222_li
Benchmark: Added a multi-client test case, BenchB (similar to TPC-B).
@history_1222_li
@history_1223_li
Compatibility: SCHEMA_NAME.SEQUENCE_NAME.NEXTVAL now works as expected.
@history_1223_li
@history_1224_li
The Console is now translated to Hungarian thanks to Andras Hideg, and to Indonesian thanks to Joko Yuliantoro
@history_1224_li
@history_1225_li
XAConnection: A NullPointerException was thrown if addConnectionEventListener was called before opening the connection.
@history_1225_li
@history_1226_li
In case the result set of a subquery was re-used, an exception was throws if the subquery result did not fit in memory. Now the result is not re-used in this case. Generally, large subqueries should be avoided for performance reasons.
@history_1226_li
@history_1227_li
The command "drop all objects delete files" did not work on linux if the database name was lower case.
@history_1227_li
@history_1228_li
When setting the URL to an empty string the DataSource now throws an better exception.
@history_1228_li
@history_1229_li
Parsing of LIKE .. ESCAPE did not stop at the expected point. Fixed.
@history_1229_li
@history_1230_li
Can now use UUID columns as generated key values. However, the UUID column must be the primary key.
@history_1230_li
@history_1231_li
Improved the Javadoc documentation. Now unsupported features are marked with [Not supported], and partially supported features are [Partially supported].
@history_1231_li
@history_1232_li
The forum subscriptions (the emails sent from the forum) now works.
@history_1232_h3
@history_1233_h3
Version 1.0.40 (2007-01-17)
@history_1233_li
@history_1234_li
Setting the collation (SET COLLATOR) was very slow on some systems (up to 24 seconds). Thanks a lot to Martina Nissler for finding this problem!
@history_1234_li
@history_1235_li
The Console is now translated to Japanese thanks to IKEMOTO, Masahiro (ikeyan (at) arizona (dot) ne (dot) jp)
@history_1235_li
@history_1236_li
The database engine can now be compiled with JDK 1.3 using ant codeswitch. There are still some limitations, and the ant script to build the jar does not work yet.
@history_1236_li
@history_1237_li
Fixed a problem where data in the log file was not written to the data file (recovery failure) after a crash, if an index was deleted previously.
@history_1237_li
@history_1238_li
SCRIPT NODATA now writes the row count for each table (this simplifies comparing databases).
@history_1238_li
@history_1239_li
Selecting a column using the syntax schemaName.tableName.columnName did not work in all cases.
@history_1239_li
@history_1240_li
Can now parse timestamps with timezone information (Z or +/-hh:mm) and dates before year 1. However dates before year 1 are not formatted correctly (this is a Java problem).
@history_1240_li
@history_1241_li
When stopping the TCP server from an application and immediately afterwards staring it again using a different TCP password, an exception was thrown sometimes.
@history_1241_li
@history_1242_li
Now PreparedStatement.setBigDecimal(..) can only be called with an object of type java.math.BigDecimal. Derived classes are not allowed any more. Many thanks to Maciej Wegorkiewicz for finding this problem.
@history_1242_li
@history_1243_li
It was possible to manipulate values in the byte array after calling PreparedStatement.setBytes, and this could lead to problems if the same byte array was used again. Now the byte array is copied if required.
@history_1243_li
@history_1244_li
Date, time and timestamp objects were cloned in cases where it was not required. Fixed.
@history_1244_h3
@history_1245_h3
Version 1.0.36 (2007-01-02)
@history_1245_li
@history_1246_li
It was possible to drop the sequence of a temporary tables with DROP ALL OBJECTS, resulting in a null pointer exception afterwards.
@history_1246_li
@history_1247_li
Prepared statements with non-constant functions such as CURRENT_TIMESTAMP() did not get re-evaluated if the result of the function changed. Fixed.
@history_1247_li
@history_1248_li
The (relative or absolute) directory where the script files are stored or read can now be changed using the system property h2.scriptDirectory
@history_1248_li
@history_1249_li
Client trace files now created in the directory 'trace.db' and no longer the application directory. This can be changed using the system property h2.clientTraceDirectory.
@history_1249_li
@history_1250_li
In some situations the log file got corrupt if the process was terminated while the database was opening.
@history_1250_li
@history_1251_li
Using ;RECOVER=1 in the database URL threw a syntax exception. Fixed.
@history_1251_li
@history_1252_li
If a CLOB or BLOB was deleted in a transaction and the database crashed before the transaction was committed or rolled back, the object was lost if it was large. Fixed.
@history_1252_li
@history_1253_li
Now using ant-build.properties. The jdk is automatically updated when using ant codeswitch...
@history_1253_li
@history_1254_li
Cluster: Now the server can detect if a query is read-only, and in this case the result is only read from the first cluster node. However, there is currently no load balancing made to avoid problems with transactions / locking.
@history_1254_li
@history_1255_li
Many settings are now initialized from system properties and can be changed on the command line without having recompile the database. See Advances / Settings Read from System Properties.
@history_1255_li
@history_1256_li
H2 is now available in Maven. The groupId is com.h2database, the artifactId h2 and the version 1.0.20061217. To create the maven artifacts yourself, use 'ant mavenUploadLocal' and 'ant mavenBuildCentral'.
@history_1256_h3
@history_1257_h3
Version 1.0.25 (2006-08-31)
@history_1257_li
@history_1258_li
In some situations, wide b-tree indexes (with large VARCHAR columns for example) could get corrupted. Fixed.
@history_1258_li
@history_1259_li
ORDER BY was broken in the last release when using table aliases. Fixed.
@history_1259_h3
@history_1260_h3
Version 0.9 (2005-12-13)
@history_1260_li
@history_1261_li
First public release.
@history_1261_h2
@history_1262_h2
Roadmap
@history_1262_h3
@history_1263_h3
Highest Priority
@history_1263_li
@history_1264_li
Improve test code coverage
@history_1264_li
@history_1265_li
More fuzz tests
@history_1265_li
@history_1266_li
Test very large databases and LOBs (up to 256 GB)
@history_1266_li
@history_1267_li
Test multi-threaded in-memory db access
@history_1267_h3
@history_1268_h3
In Version 1.1
@history_1268_li
@history_1269_li
Add version number. Install directory: h2-1.0, jar file: h2-1.0.jar. Micro version: use build number, staring with 1.1.100
@history_1269_li
@history_1270_li
Automatic upgrade if there is a file format change
@history_1270_li
@history_1271_li
ALTER TABLE on a table with a LOB could result in 'Cannot delete file' on some systems. Fixed.
@history_1271_li
@history_1272_li
Change Constants.DEFAULT_MAX_MEMORY_UNDO to 10000 (and change the docs). Test.
@history_1272_li
@history_1273_li
Enable and document optimizations, LOB files in directories
@history_1273_li
@history_1274_li
Special methods for DataPage.writeByte / writeShort and so on
@history_1274_li
@history_1275_li
Index organized tables CREATE TABLE...(...) ORGANIZATION INDEX (store in data file) (probably file format changes are required for rowId)
@history_1275_li
@history_1276_li
Change the default for NULL || 'x' to NULL
@history_1276_h3
@history_1277_h3
Priority 1
@history_1277_li
MVCC (Multi Version Concurrency Control)
@history_1278_li
Read-only databases inside a jar (splitting large files to speed up random access)
MVCC (Multi Version Concurrency Control)
@history_1279_li
RECOVER=1 should automatically recover, =2 should run the recovery tool if required
Read-only databases inside a jar (splitting large files to speed up random access)
@history_1280_li
More tests with MULTI_THREADED=1
RECOVER=1 should automatically recover, =2 should run the recovery tool if required
@history_1281_li
Improve performance for create table (if this is possible)
More tests with MULTI_THREADED=1
@history_1282_li
Test with Spatial DB in a box / JTS (http://docs.codehaus.org/display/GEOS/SpatialDBBox)
Run H2 Console inside servlet (pass-through servlet of fix the JSP / app)
Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
@history_1350_li
Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
Make the jar more modular
@history_1351_li
Make the jar more modular
Drop with restrict (currently cascade is the default)
@history_1352_li
Drop with restrict (currently cascade is the default)
JSON parser and functions
@history_1353_li
JSON parser and functions
Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
@history_1354_li
Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
Automatic collection of statistics (auto ANALYZE)
@history_1355_li
Automatic collection of statistics (auto ANALYZE)
Server: client ping from time to time (to avoid timeout - is timeout a problem?)
@history_1356_li
Server: client ping from time to time (to avoid timeout - is timeout a problem?)
Copy database: Tool with config GUI and batch mode, extensible (example: compare)
@history_1357_li
Copy database: Tool with config GUI and batch mode, extensible (example: compare)
Document, implement tool for long running transactions using user defined compensation statements
@history_1358_li
Document, implement tool for long running transactions using user defined compensation statements
Support SET TABLE DUAL READONLY
@history_1359_li
Support SET TABLE DUAL READONLY
Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
@history_1360_li
Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
Don't write stack traces for common exceptions like duplicate key to the log by default
@history_1361_li
Don't write stack traces for common exceptions like duplicate key to the log by default
Setting for MAX_QUERY_TIME (default no limit?)
@history_1362_li
Setting for MAX_QUERY_TIME (default no limit?)
GCJ: what is the state now?
@history_1363_li
GCJ: what is the state now?
Convert large byte[]/Strings to streams in the JDBC API (asap).
@history_1364_li
Convert large byte[]/Strings to streams in the JDBC API (asap).
Use Janino to convert Java to C++
@history_1365_li
Use Janino to convert Java to C++
Reduce disk space usage (Derby uses less disk space?)
@history_1366_li
Reduce disk space usage (Derby uses less disk space?)
Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
@history_1367_li
Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
Optimization: Log compression
@history_1368_li
Optimization: Log compression
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
@history_1369_li
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
@history_1370_li
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
Custom class loader to reload functions on demand
@history_1371_li
Custom class loader to reload functions on demand
Test http://mysql-je.sourceforge.net/
@history_1372_li
Test http://mysql-je.sourceforge.net/
Close all files when closing the database (including LOB files that are open on the client side)
@history_1373_li
Close all files when closing the database (including LOB files that are open on the client side)
Test Connection Pool http://jakarta.apache.org/commons/dbcp
@history_1374_li
Test Connection Pool http://jakarta.apache.org/commons/dbcp
Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
@history_1375_li
Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
Function to read/write a file from/to LOB
@history_1376_li
Function to read/write a file from/to LOB
Allow custom settings (@PATH for RUNSCRIPT for example)
@history_1377_li
Allow custom settings (@PATH for RUNSCRIPT for example)
Performance test: read the data (getString) and use column names to get the data
@history_1378_li
Performance test: read the data (getString) and use column names to get the data
EXE file: maybe use http://jsmooth.sourceforge.net
@history_1379_li
EXE file: maybe use http://jsmooth.sourceforge.net
SELECT ... FOR READ WAIT [maxMillisToWait]
@history_1380_li
SELECT ... FOR READ WAIT [maxMillisToWait]
Automatically delete the index file if opening it fails
@history_1381_li
Automatically delete the index file if opening it fails
Performance: Automatically build in-memory indexes if the whole table is in memory
@history_1382_li
Performance: Automatically build in-memory indexes if the whole table is in memory
H2 Console: The webclient could support more features like phpMyAdmin.
@history_1383_li
H2 Console: The webclient could support more features like phpMyAdmin.
The HELP information schema can be directly exposed in the Console
@history_1384_li
The HELP information schema can be directly exposed in the Console
Maybe use the 0x1234 notation for binary fields, see MS SQL Server
@history_1385_li
Maybe use the 0x1234 notation for binary fields, see MS SQL Server
Version column (number/sequence and timestamp based)
@history_1390_li
Version column (number/sequence and timestamp based)
Optimize getGeneratedKey: send last identity after each execute (server).
@history_1391_li
Optimize getGeneratedKey: send last identity after each execute (server).
Date: default date is '1970-01-01' (is it 1900-01-01 in the standard / other databases?)
@history_1392_li
Date: default date is '1970-01-01' (is it 1900-01-01 in the standard / other databases?)
Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID);
@history_1393_li
Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID);
Better space re-use in the files after deleting data (shrink the files)
@history_1394_li
Better space re-use in the files after deleting data (shrink the files)
Max memory rows / max undo log size: use block count / row size not row count
@history_1395_li
Max memory rows / max undo log size: use block count / row size not row count
Index summary is only written if log=2; maybe write it also when log=1 and everything is fine (and no in doubt transactions)
@history_1396_li
Index summary is only written if log=2; maybe write it also when log=1 and everything is fine (and no in doubt transactions)
Support 123L syntax as in Java; example: SELECT (2000000000*2)
@history_1397_li
Support 123L syntax as in Java; example: SELECT (2000000000*2)
Implement point-in-time recovery
@history_1398_li
Implement point-in-time recovery
Memory database: add a feature to keep named database open until 'shutdown'
@history_1399_li
Memory database: add a feature to keep named database open until 'shutdown'
Use the directory of the first script as the default directory for any scripts run inside that script
@history_1400_li
Use the directory of the first script as the default directory for any scripts run inside that script
Include the version name in the jar file name
@history_1401_li
Include the version name in the jar file name
Optimize IN(...), IN(select), ID=? OR ID=?: create temp table and use join
@history_1402_li
Optimize IN(...), IN(select), ID=? OR ID=?: create temp table and use join
LIKE: improved version for larger texts (currently using naive search)
@history_1403_li
LIKE: improved version for larger texts (currently using naive search)
Auto-reconnect on lost connection to server (even if the server was re-started) except if autocommit was off and there was pending transaction
@history_1404_li
Auto-reconnect on lost connection to server (even if the server was re-started) except if autocommit was off and there was pending transaction
The Script tool should work with other databases as well
@history_1405_li
The Script tool should work with other databases as well
Automatically convert to the next 'higher' data type whenever there is an overflow.
@history_1406_li
Automatically convert to the next 'higher' data type whenever there is an overflow.
Throw an exception when the application calls getInt on a Long (optional)
@history_1407_li
Throw an exception when the application calls getInt on a Long (optional)
Default date format for input and output (local date constants)
@history_1408_li
Default date format for input and output (local date constants)
Cache collation keys for performance
@history_1409_li
Cache collation keys for performance
Convert OR condition to UNION or IN if possible
@history_1410_li
Convert OR condition to UNION or IN if possible
ValueInt.convertToString and so on (remove Value.convertTo)
@history_1411_li
ValueInt.convertToString and so on (remove Value.convertTo)
Support custom Collators
@history_1412_li
Support custom Collators
Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery)
@history_1413_li
Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery)
Clustering: Reads should be randomly distributed or to a designated database on RAM
@history_1414_li
Clustering: Reads should be randomly distributed or to a designated database on RAM
Clustering: When a database is back alive, automatically synchronize with the master
@history_1415_li
Clustering: When a database is back alive, automatically synchronize with the master
Standalone tool to get relevant system properties and add it to the trace output.
@history_1416_li
Standalone tool to get relevant system properties and add it to the trace output.
Support mixed clustering mode (one embedded, the other server mode)
@history_1417_li
Support mixed clustering mode (one embedded, the other server mode)
Support 'call proc($1=value)' (PostgreSQL, Oracle)
@history_1418_li
Support 'call proc($1=value)' (PostgreSQL, Oracle)
HSQLDB compatibility: "INSERT INTO TEST(name) VALUES(?); SELECT IDENTITY()"
@history_1419_li
HSQLDB compatibility: "INSERT INTO TEST(name) VALUES(?); SELECT IDENTITY()"
Shutdown lock (shutdown can only start if there are no logins pending, and logins are delayed until shutdown ends)
@history_1420_li
Shutdown lock (shutdown can only start if there are no logins pending, and logins are delayed until shutdown ends)
Automatically delete the index file if opening it fails
@history_1421_li
Automatically delete the index file if opening it fails
DbAdapters http://incubator.apache.org/cayenne/
@history_1422_li
DbAdapters http://incubator.apache.org/cayenne/
JAMon (proxy jdbc driver)
@history_1423_li
JAMon (proxy jdbc driver)
Console: Allow setting Null value; Alternative display format two column (for copy and paste as well)
@history_1424_li
Console: Allow setting Null value; Alternative display format two column (for copy and paste as well)
Console: Improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
@history_1425_li
Console: Improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
Console: Autocomplete Ctrl+Space inserts template
@history_1426_li
Console: Autocomplete Ctrl+Space inserts template
Google Code http://code.google.com/p/h2database/issues/list#
@history_1427_li
Google Code http://code.google.com/p/h2database/issues/list#
Simplify translation ('Donate a translation')
@history_1428_li
Simplify translation ('Donate a translation')
Option to encrypt .trace.db file
@history_1429_li
Option to encrypt .trace.db file
Improve create index performance
@history_1430_li
Improve create index performance
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@history_1431_li
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
Functions with unknown return or parameter data types: serialize / deserialize
@history_1432_li
Functions with unknown return or parameter data types: serialize / deserialize
Test if idle TCP connections are closed, and how to disable that
@history_1433_li
Test if idle TCP connections are closed, and how to disable that
Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
@history_1434_li
Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
Auto-Update feature for database, .jar file
@history_1435_li
Auto-Update feature for database, .jar file
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
@history_1436_li
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
RANK() and DENSE_RANK(), Partition using OVER()
@history_1437_li
RANK() and DENSE_RANK(), Partition using OVER()
ROW_NUMBER (not the same as ROWNUM)
@history_1438_li
ROW_NUMBER (not the same as ROWNUM)
Partial indexing (see PostgreSQL)
@history_1439_li
Partial indexing (see PostgreSQL)
BUILD should fail if ant test fails
@history_1440_li
BUILD should fail if ant test fails
http://rubyforge.org/projects/hypersonic/
@history_1441_li
http://rubyforge.org/projects/hypersonic/
DbVisualizer profile for H2
@history_1442_li
DbVisualizer profile for H2
Add comparator (x === y) : (x = y or (x is null and y is null))
@history_1443_li
Add comparator (x === y) : (x = y or (x is null and y is null))
Try to create trace file even for read only databases
@history_1444_li
Try to create trace file even for read only databases
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
@history_1445_li
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
Count on a column that can not be null would be optimized to COUNT(*)
@history_1446_li
Count on a column that can not be null would be optimized to COUNT(*)
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
@history_1447_li
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
Backup tool should work with other databases as well
@history_1448_li
Backup tool should work with other databases as well
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
@history_1449_li
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
Maybe use Fowler Noll Vo hash function
@history_1450_li
Maybe use Fowler Noll Vo hash function
Improved full text search (supports LOBs, reader / tokenizer / filter).
@history_1451_li
Improved full text search (supports LOBs, reader / tokenizer / filter).
Performance: Update in-place
@history_1452_li
Performance: Update in-place
Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
@history_1453_li
Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
Functions: options readonly, deterministic (pure, always return the same value)
@history_1487_li
Functions: options readonly, deterministic (pure, always return the same value)
Document FTP server, including -ftpTask option to execute / kill remote processes
@history_1488_li
Document FTP server, including -ftpTask option to execute / kill remote processes
Add jdbcx to the javadocs
@history_1489_li
Add jdbcx to the javadocs
Shrink the data file without closing the database (if the end of the file is empty)
@history_1490_li
Shrink the data file without closing the database (if the end of the file is empty)
Delay reading the row if data is not required
@history_1491_li
Delay reading the row if data is not required
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@history_1492_li
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
Feature matrix like here: http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp.
@history_1493_li
Feature matrix like here: http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp.
Updatable result set on table without primary key or unique index
@history_1494_li
Updatable result set on table without primary key or unique index
Use LinkedList instead of ArrayList where applicable
@history_1495_li
Use LinkedList instead of ArrayList where applicable
Optimization: (A=B AND B=C) > (A=B AND B=C AND A=C)
@history_1496_li
Optimization: (A=B AND B=C) > (A=B AND B=C AND A=C)
Support % operator (modulo)
@history_1497_li
Support % operator (modulo)
Large subqueries: close them when the main query is closed, not earlier (so result can be reused)
@history_1498_li
Large subqueries: close them when the main query is closed, not earlier (so result can be reused)
Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
@history_1499_li
Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
Support nested transactions
@history_1500_li
Support nested transactions
Add a benchmark for big databases, and one for many users
@history_1501_li
Add a benchmark for big databases, and one for many users
Compression in the result set (repeating values in the same column)
@history_1502_li
Compression in the result set (repeating values in the same column)
Improve command line consistency (+/- options, or true false options)
@history_1503_li
Improve command line consistency (+/- options, or true false options)
Allow to use the catalog name in statements: [[catalog.]schema.]object
@history_1504_li
Allow to use the catalog name in statements: [[catalog.]schema.]object
Support curtimestamp (like curtime, curdate)
@history_1505_li
Support curtimestamp (like curtime, curdate)
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
@history_1506_li
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
Support Sequoia (Continuent.org)
@history_1507_li
Support Sequoia (Continuent.org)
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
@history_1508_li
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
Pluggable tracing system, ThreadPool, (AvalonDB / deebee / Paul Hammant)
@history_1509_li
Pluggable tracing system, ThreadPool, (AvalonDB / deebee / Paul Hammant)
Recursive Queries (see details)
@history_1510_li
Recursive Queries (see details)
Use index on boolean flag (see details)
@history_1511_li
Use index on boolean flag (see details)
Add build for embedded database only
@history_1512_li
Add build for embedded database only
Release locks (shared or exclusive) on demand
@history_1513_li
Release locks (shared or exclusive) on demand
Support catalog names
@history_1514_li
Support catalog names
Add object id to metadata tables
@history_1515_li
Add object id to metadata tables
Support OUTER UNION
@history_1516_li
Support OUTER UNION
Support Parameterized Views (similar to CSVREAD, but using just SQL for the definition)
@history_1517_li
Support Parameterized Views (similar to CSVREAD, but using just SQL for the definition)
Implement a command line SQL utility similar to HenPlus: http://henplus.sourceforge.net
@history_1518_li
Implement a command line SQL utility similar to HenPlus: http://henplus.sourceforge.net
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
@history_1519_li
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
Build script for the embedded functionality only (h2embedded.jar)
@history_1520_li
Build script for the embedded functionality only (h2embedded.jar)
Option for SCRIPT to only process one or a set of tables, and append to a file
@history_1521_li
Option for SCRIPT to only process one or a set of tables, and append to a file
Support using a unique index for IS NULL (including linked tables)
@history_1522_li
Support using a unique index for IS NULL (including linked tables)
Support linked tables to the current database
@history_1523_li
Support linked tables to the current database
Support dynamic linked schema (automatically adding/updating/removing tables)
@history_1524_li
Support dynamic linked schema (automatically adding/updating/removing tables)
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@history_1525_li
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@history_1526_li
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
Run benchmarks with JDK 1.5, JDK 1.6, java -server
@history_1527_li
Run benchmarks with JDK 1.5, JDK 1.6, java -server
Optimizations: Faster hash function for strings, byte arrays, big decimal
@history_1528_li
Optimizations: Faster hash function for strings, byte arrays, big decimal
Improve trace feature: add replay functionality
@history_1529_li
Improve trace feature: add replay functionality
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@history_1530_li
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
@history_1531_li
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
Benchmark: add a graph to show how databases scale (performance/database size)
@history_1532_li
Benchmark: add a graph to show how databases scale (performance/database size)
Implement a SQLData interface to map your data over to a custom object
@history_1533_li
Implement a SQLData interface to map your data over to a custom object
Extend H2 Console to run tools (show command line as well)
@history_1534_li
Extend H2 Console to run tools (show command line as well)
Make DDL (Data Definition) operations transactional
@history_1535_li
Make DDL (Data Definition) operations transactional
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@history_1536_li
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
Support multiple directories (on different hard drives) for the same database
@history_1537_li
Support multiple directories (on different hard drives) for the same database
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@history_1538_li
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@history_1539_li
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
@history_1540_li
GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
Support native XML data type
@history_1541_li
Support native XML data type
Support triggers with a string property or option: SpringTrigger, OSGITrigger
@history_1542_li
Support triggers with a string property or option: SpringTrigger, OSGITrigger
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@history_1543_li
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
Support materialized views (using triggers)
@history_1544_li
Support materialized views (using triggers)
Store dates in local timezone (portability of database files)
@history_1545_li
Store dates in local timezone (portability of database files)
Ability to resize the cache array when resizing the cache
@history_1546_li
Ability to resize the cache array when resizing the cache
Automatic conversion from WHERE X>10 AND X>20 to X>20
@history_1547_li
Automatic conversion from WHERE X>10 AND X>20 to X>20
Time based cache writing (one second after writing the log)
@history_1548_li
Time based cache writing (one second after writing the log)
Write a H2 driver for http://db.apache.org/ddlutils/
@history_1549_li
Write a H2 driver for http://db.apache.org/ddlutils/
Index usage for REGEXP LIKE.
@history_1550_li
Index usage for REGEXP LIKE.
Add a role DBA (like ADMIN).
@history_1551_li
Add a role DBA (like ADMIN).
Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
@history_1552_li
Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
@history_1553_li
Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
Implement INSTEAD OF trigger.
@history_1554_li
Implement INSTEAD OF trigger.
Access rights: Finer grained access control (grant access for specific functions)
@history_1555_li
Access rights: Finer grained access control (grant access for specific functions)
Support N'text'
@history_1556_li
Support N'text'
Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
@history_1557_li
Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
@history_1558_li
Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
Set a connection read only (Connection.setReadOnly)
@history_1559_li
Set a connection read only (Connection.setReadOnly)
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@history_1560_li
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@history_1561_li
Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
Read-only sessions (Connection.setReadOnly)
@history_1562_li
Read-only sessions (Connection.setReadOnly)
Support compatibility for jdbc:hsqldb:res:
@history_1563_li
Support compatibility for jdbc:hsqldb:res:
In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@history_1564_li
In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
Provide a simple, lightweight O/R mapping tool
@history_1565_li
Provide a simple, lightweight O/R mapping tool
Provide an Java SQL builder with standard and H2 syntax
@history_1566_li
Provide an Java SQL builder with standard and H2 syntax
Data compression for in-memory database
@history_1567_li
Data compression for in-memory database
Trace: write os, file system, vm,... when opening the database
@history_1568_li
Trace: write os, file system, vm,... when opening the database
Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
@history_1569_li
Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
ParameterMetaData should return correct data type where possible (INSERT for example)
@history_1570_li
ParameterMetaData should return correct data type where possible (INSERT for example)
Support indexes for views (probably requires materialized views)
@history_1571_li
Support indexes for views (probably requires materialized views)
Linked tables that point to the same database should share the connection
@history_1572_li
Linked tables that point to the same database should share the connection
Use log for rollback
@history_1573_li
Use log for rollback
Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
@history_1574_li
Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
Complete Javadocs for ErrorCode messages and add to docs
@history_1575_li
Complete Javadocs for ErrorCode messages and add to docs
Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
@history_1576_li
Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
Document org.h2.samples.MixedMode
@history_1577_li
Document org.h2.samples.MixedMode
Server: use one listener (detect if the request comes from an PG or TCP client)
@history_1578_li
Server: use one listener (detect if the request comes from an PG or TCP client)
Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
@history_1579_li
Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
Support data type INTERVAL
@history_1580_li
Support data type INTERVAL
NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
@history_1581_li
NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
@history_1582_li
Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER
@history_1583_li
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER
Support setQueryTimeout (using System.currentTimeMillis in a loop; not using a thread)
@history_1584_li
Support setQueryTimeout (using System.currentTimeMillis in a loop; not using a thread)
Support large updates and deletes (currently all rows are loaded into memory)
@history_1585_h3
Not Planned
...
...
@@ -5021,7 +5012,7 @@ JDBC and (partial) ODBC API; Web Client application
#Usually, bugs get fixes as they are found. There is a release every few weeks. Here is the list of known and confirmed issues as of 2007-10-20: #バグは発見された時点で改修をしています。数週おきに更新版がリリースされています。以下は2007年9月15日の時点で発見され、確認された問題の一覧です:
#User defined aggregate functions are not supported.
#JdbcXAConnection: starting a transaction before getting the connection didn't switch off autocommit.
@history_1011_li
#Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
#User defined aggregate functions are not supported.
@history_1012_li
#Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
#Server.shutdownTcpServer was blocked when first called with force=false and then force=true. Now documentation is improved, and it is no longer blocked.
@history_1013_li
#Linked tables: now tables in non-default schemas are supported as well
#Stack traces did not include the SQL statement in all cases where they could have. Also, stack traces with SQL statement are now shorter.
@history_1014_li
#New Italian translation from PierPaolo Ucchino. Thanks a lot!
#Linked tables: now tables in non-default schemas are supported as well
@history_1015_li
#CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods.
#New Italian translation from PierPaolo Ucchino. Thanks a lot!
#CSV: New methods to set the escape character and field delimiter in the Csv tool and the CSVWRITE and CSVREAD methods. #データ定義ステートメント (テーブル作成等) の後にPrepared statementが使用できませんでしたが、これを修正しました
独立したサブクエリーの最適化が行われました。例えば、このクエリーは現在インデックスです：SELECT * FROM TEST WHERE ID = (SELECT MAX(ID) FROM TEST) システムプロパティ h2.optimizeSubqueryCacheをfalseに設定することにより、無効にすることが可能です
@history_1039_li
@history_1040_li
もしクエリーが行を読み込むことなく直接処理することが可能な場合、例えば MIN(indexed column)、MAX(indexed column)、またはCOUNT(*) を利用している時、実行計画は現在次のように示しています: /* direct lookup query */
LOBのReaderもしくはInputStreamが閉じられていない場合、エンベッドモードに限り、LOBを削除することができません。例外は通常"Error while renaming file"です。対応策としては、読み込み時にLOBファイルを閉じるよう、システムプロパティのh2.lobCloseBetweenReadsをtrueに設定してください。ただし、この場合読み込みは遅くなります
#Unnamed private in-memory database (jdbc:h2:mem:) were not 'private' as documented. Fixed.
@history_1168_li
@history_1169_li
#Autocomplete in the Console application: now the result frame scrolls to the top when the list is updated.
@history_1169_li
@history_1170_li
#GROUP BY expressions did not work correctly in subqueries. Fixed.
@history_1170_li
@history_1171_li
#New function TABLE to define ad-hoc (temporary) tables in a query. This also solves problems with variable-size IN(...) queries: instead of SELECT * FROM TEST WHERE ID IN(?, ?, ...) you can now write: SELECT * FROM TABLE(ID INT=?) X, TEST WHERE X.ID=TEST.ID In this case, the index is used.
@history_1171_li
@history_1172_li
#New data type ARRAY. Actually it was there before, but is now documented and better tested (however it must still be considered experimental). The java.sql.Array implementation is incomplete, but setObject(1, new Object[]{...}) and getObject(..) can be used. New functions ARRAY_GET and ARRAY_LENGTH.
@history_1172_li
@history_1173_li
#SimpleResultSet now has some basic data type conversion features.
@history_1173_li
@history_1174_li
#When using JDK 1.5 or later, and switching on h2.lobFilesInDirectories, the performance for creating LOBs was bad. This has been fixed, however creating lots of LOBs it is still faster when the setting is switched off.
@history_1174_li
@history_1175_li
#A problem with multiple unnamed dynamic tables (FROM (SELECT...)) has been fixed.
@history_1175_li
@history_1176_li
#Appending 'Z' to a timestamp did not have an effect. Now it is interpreted as +00:00 (GMT).
@history_1176_li
@history_1177_li
#The BACKUP command is better tested and documented. This means hot backup (online backup) is now possible.
@history_1177_li
@history_1178_li
#The old 'Backup' tool is now called 'Script' (as the SQL statement).
@history_1178_li
@history_1179_li
#There are new 'Backup' and 'Restore' tools that work with database files directly.
@history_1179_li
@history_1180_li
#The complete syntax for referential and check constraints is now supported when written as part of the column definition, behind PRIMARY KEY.
@history_1180_li
@history_1181_li
#CASE WHEN ... returned the wrong result when the condition evaluated to NULL.
@history_1181_li
@history_1182_li
#The new function LINK_SCHEMA simplifies linking all tables of a schema.
@history_1182_li
@history_1183_li
#SCRIPT DROP now also drops aliases (Java functions) if they exist.
@history_1183_li
@history_1184_li
#For encrypted databases, the trace option can no longer be enabled manually by creating a file.
@history_1184_li
@history_1185_li
#For linked tables, NULL in the unique key is now supported.
@history_1185_li
@history_1186_li
#For read-only databases, temp files are now created in the default temp directory instead of the database directory.
@history_1186_li
@history_1187_li
#Sending CLOB data was slow in some systems when using the server version. Fixed.
@history_1187_li
@history_1188_li
#CSVWRITE now returns the number of rows written.
@history_1188_li
@history_1189_li
#The data type of NULLIF was NULL if the first expression was a column. Now the data type is set correctly.
@history_1189_li
@history_1190_li
#Indexes (and other related objects) for local temporary tables where not dropped when the session was closed. Fixed.
@history_1190_li
@history_1191_li
#ALTER TABLE did not work for tables with computed columns.
@history_1191_li
@history_1192_li
#SQLException.getCause of the now works for JDK 1.4 and higher.
@history_1192_li
@history_1193_li
#If the index file was deleted, an error was logged in the .trace.db file. This is no longer done.
@history_1193_li
@history_1194_li
#The Portuguese (Europe) translation is available. Thanks a lot to Antonio Casqueiro!
@history_1194_li
@history_1195_li
#The error message for invalid views has been improved (the root cause is included in the message now).
@history_1195_li
@history_1196_li
#IN(SELECT ...) was not working correctly if the subquery returned a NULL value. Fixed.
@history_1196_li
@history_1197_li
#DROP ALL OBJECTS did not drop constants.
@history_1197_li
@history_1198_li
#DROP ALL OBJECTS dropped the role PUBLIC, which was wrong. Fixed.
@history_1198_li
@history_1199_li
#CASE was parsed as a function if the expression was in (). Fixed.
@history_1199_li
@history_1200_li
#When ORDER BY was used together with DISTINCT, it was required to type the column name exactly in the select list and the order list exactly in the same way. This is not required any longer.
@history_1200_h3
@history_1201_h3
#Version 1.0.44 (2007-03-04)
@history_1201_li
@history_1202_li
#System sequences (automatically created sequences for IDENTITY or AUTO_INCREMENT columns) are now random (UUIDs) to avoid clashes when merging databases using RUNSCRIPT.
@history_1202_li
@history_1203_li
#The precision for linked tables was not correct for some data types, for example VARCHAR. Fixed.
@history_1203_li
@history_1204_li
#Many problems and bugs in the XA support (package javax.sql) have been fixed.
@history_1204_li
@history_1205_li
#Now the server tool (org.h2.tools.Server) terminates with an exit code if a problem occured.
@history_1205_li
@history_1206_li
#The JDBC driver is now loaded if the JdbcDataSource class is loaded.
@history_1206_li
@history_1207_li
#After renaming a user the password becomes invalid. This is now documented.
@history_1207_li
@history_1208_li
#XAResource.recover didn't work. Fixed.
@history_1208_li
@history_1209_li
#XAResource.recover did throw an exception with the code XAER_OUTSIDE if there was no connection. Now the code is XAER_RMERR.
@history_1209_li
@history_1210_li
#SCRIPT did not work correctly with BLOB or CLOB data. Fixed.
@history_1210_li
@history_1211_li
#BACKUP TO 'test.zip' now works with encrypted databases and CLOB and BLOB data.
@history_1211_li
@history_1212_li
#The function CASE WHEN ... didn't convert the returned value to the same data type, resulting in unexpected behavior in many cases. Fixed.
@history_1212_li
@history_1213_li
#Truncating a table is now allowed if the table references another table (but still not allowed if the table is references by another table).
@history_1213_li
@history_1214_li
#ORDER BY picked the wrong column if the same column name (but with a different table name) was used twice in the select list.
@history_1214_li
@history_1215_li
#When a subquery was used in the select list of a query, and GROUP BY was used at the same time, a NullPointerException could occur. Fixed.
@history_1215_li
@history_1216_li
#ORDER BY did not work when DISTINCT was used at the same time in some situations. Fixed.
@history_1216_li
@history_1217_li
#When using IN(...) on a case insensitive column (VARCHAR_IGNORECASE), an incorrect optimization was made and the result was wrong sometimes.
@history_1217_h3
@history_1218_h3
#Version 1.0.41 (2007-01-30)
@history_1218_li
@history_1219_li
#Experimental online backup feature using the SQL statement BACKUP TO 'fileName'. This creates a backup in the form of a zip file. Unlike the SCRIPT TO command, the data tables are not locked.
@history_1219_li
@history_1220_li
#When using the server mode, temporary files for large LOB values are now deleted when the result set is closed. This also means that LOBs become unavailable after closing the result, however this is according to the specs.
@history_1220_li
@history_1221_li
#It was possible that SUM throws a class cast exception if the parameter was a conditional expression.
@history_1221_li
@history_1222_li
#Benchmark: Added a multi-client test case, BenchB (similar to TPC-B).
@history_1222_li
@history_1223_li
#Compatibility: SCHEMA_NAME.SEQUENCE_NAME.NEXTVAL now works as expected.
@history_1223_li
@history_1224_li
#The Console is now translated to Hungarian thanks to Andras Hideg, and to Indonesian thanks to Joko Yuliantoro
@history_1224_li
@history_1225_li
#XAConnection: A NullPointerException was thrown if addConnectionEventListener was called before opening the connection.
@history_1225_li
@history_1226_li
#In case the result set of a subquery was re-used, an exception was throws if the subquery result did not fit in memory. Now the result is not re-used in this case. Generally, large subqueries should be avoided for performance reasons.
@history_1226_li
@history_1227_li
#The command "drop all objects delete files" did not work on linux if the database name was lower case.
@history_1227_li
@history_1228_li
#When setting the URL to an empty string the DataSource now throws an better exception.
@history_1228_li
@history_1229_li
#Parsing of LIKE .. ESCAPE did not stop at the expected point. Fixed.
@history_1229_li
@history_1230_li
#Can now use UUID columns as generated key values. However, the UUID column must be the primary key.
@history_1230_li
@history_1231_li
#Improved the Javadoc documentation. Now unsupported features are marked with [Not supported], and partially supported features are [Partially supported].
@history_1231_li
@history_1232_li
#The forum subscriptions (the emails sent from the forum) now works.
@history_1232_h3
@history_1233_h3
#Version 1.0.40 (2007-01-17)
@history_1233_li
@history_1234_li
#Setting the collation (SET COLLATOR) was very slow on some systems (up to 24 seconds). Thanks a lot to Martina Nissler for finding this problem!
@history_1234_li
@history_1235_li
#The Console is now translated to Japanese thanks to IKEMOTO, Masahiro (ikeyan (at) arizona (dot) ne (dot) jp)
@history_1235_li
@history_1236_li
#The database engine can now be compiled with JDK 1.3 using ant codeswitch. There are still some limitations, and the ant script to build the jar does not work yet.
@history_1236_li
@history_1237_li
#Fixed a problem where data in the log file was not written to the data file (recovery failure) after a crash, if an index was deleted previously.
@history_1237_li
@history_1238_li
#SCRIPT NODATA now writes the row count for each table (this simplifies comparing databases).
@history_1238_li
@history_1239_li
#Selecting a column using the syntax schemaName.tableName.columnName did not work in all cases.
@history_1239_li
@history_1240_li
#Can now parse timestamps with timezone information (Z or +/-hh:mm) and dates before year 1. However dates before year 1 are not formatted correctly (this is a Java problem).
@history_1240_li
@history_1241_li
#When stopping the TCP server from an application and immediately afterwards staring it again using a different TCP password, an exception was thrown sometimes.
@history_1241_li
@history_1242_li
#Now PreparedStatement.setBigDecimal(..) can only be called with an object of type java.math.BigDecimal. Derived classes are not allowed any more. Many thanks to Maciej Wegorkiewicz for finding this problem.
@history_1242_li
@history_1243_li
#It was possible to manipulate values in the byte array after calling PreparedStatement.setBytes, and this could lead to problems if the same byte array was used again. Now the byte array is copied if required.
@history_1243_li
@history_1244_li
#Date, time and timestamp objects were cloned in cases where it was not required. Fixed.
@history_1244_h3
@history_1245_h3
#Version 1.0.36 (2007-01-02)
@history_1245_li
@history_1246_li
#It was possible to drop the sequence of a temporary tables with DROP ALL OBJECTS, resulting in a null pointer exception afterwards.
@history_1246_li
@history_1247_li
#Prepared statements with non-constant functions such as CURRENT_TIMESTAMP() did not get re-evaluated if the result of the function changed. Fixed.
@history_1247_li
@history_1248_li
#The (relative or absolute) directory where the script files are stored or read can now be changed using the system property h2.scriptDirectory
@history_1248_li
@history_1249_li
#Client trace files now created in the directory 'trace.db' and no longer the application directory. This can be changed using the system property h2.clientTraceDirectory.
@history_1249_li
@history_1250_li
#In some situations the log file got corrupt if the process was terminated while the database was opening.
@history_1250_li
@history_1251_li
#Using ;RECOVER=1 in the database URL threw a syntax exception. Fixed.
@history_1251_li
@history_1252_li
#If a CLOB or BLOB was deleted in a transaction and the database crashed before the transaction was committed or rolled back, the object was lost if it was large. Fixed.
@history_1252_li
@history_1253_li
#Now using ant-build.properties. The jdk is automatically updated when using ant codeswitch...
@history_1253_li
@history_1254_li
#Cluster: Now the server can detect if a query is read-only, and in this case the result is only read from the first cluster node. However, there is currently no load balancing made to avoid problems with transactions / locking.
@history_1254_li
@history_1255_li
#Many settings are now initialized from system properties and can be changed on the command line without having recompile the database. See Advances / Settings Read from System Properties.
@history_1255_li
@history_1256_li
#H2 is now available in Maven. The groupId is com.h2database, the artifactId h2 and the version 1.0.20061217. To create the maven artifacts yourself, use 'ant mavenUploadLocal' and 'ant mavenBuildCentral'.
@history_1256_h3
@history_1257_h3
#Version 1.0.25 (2006-08-31)
@history_1257_li
@history_1258_li
#In some situations, wide b-tree indexes (with large VARCHAR columns for example) could get corrupted. Fixed.
@history_1258_li
@history_1259_li
#ORDER BY was broken in the last release when using table aliases. Fixed.
@history_1259_h3
@history_1260_h3
#Version 0.9 (2005-12-13)
@history_1260_li
@history_1261_li
#First public release.
@history_1261_h2
@history_1262_h2
ロードマップ
@history_1262_h3
@history_1263_h3
#Highest Priority
@history_1263_li
@history_1264_li
#Improve test code coverage
@history_1264_li
@history_1265_li
#More fuzz tests
@history_1265_li
@history_1266_li
#Test very large databases and LOBs (up to 256 GB)
@history_1266_li
@history_1267_li
#Test multi-threaded in-memory db access
@history_1267_h3
@history_1268_h3
#In Version 1.1
@history_1268_li
@history_1269_li
#Add version number. Install directory: h2-1.0, jar file: h2-1.0.jar. Micro version: use build number, staring with 1.1.100
@history_1269_li
@history_1270_li
#Automatic upgrade if there is a file format change
@history_1270_li
@history_1271_li
#ALTER TABLE on a table with a LOB could result in 'Cannot delete file' on some systems. Fixed.
@history_1271_li
@history_1272_li
#Change Constants.DEFAULT_MAX_MEMORY_UNDO to 10000 (and change the docs). Test.
@history_1272_li
@history_1273_li
#Enable and document optimizations, LOB files in directories
@history_1273_li
@history_1274_li
#Special methods for DataPage.writeByte / writeShort and so on
@history_1274_li
@history_1275_li
#Index organized tables CREATE TABLE...(...) ORGANIZATION INDEX (store in data file) (probably file format changes are required for rowId)
@history_1275_li
@history_1276_li
#Change the default for NULL || 'x' to NULL
@history_1276_h3
@history_1277_h3
#Priority 1
@history_1277_li
#MVCC (Multi Version Concurrency Control)
@history_1278_li
#Read-only databases inside a jar (splitting large files to speed up random access)
#MVCC (Multi Version Concurrency Control)
@history_1279_li
#RECOVER=1 should automatically recover, =2 should run the recovery tool if required
#Read-only databases inside a jar (splitting large files to speed up random access)
@history_1280_li
#More tests with MULTI_THREADED=1
#RECOVER=1 should automatically recover, =2 should run the recovery tool if required
@history_1281_li
#Improve performance for create table (if this is possible)
#More tests with MULTI_THREADED=1
@history_1282_li
#Test with Spatial DB in a box / JTS (http://docs.codehaus.org/display/GEOS/SpatialDBBox)
...
...
@@ -3817,712 +3808,712 @@ Version 1.0.46 (2007-04-29)
#Compression of the cache
@history_1349_li
#Run H2 Console inside servlet (pass-through servlet of fix the JSP / app)
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
@history_1350_li
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
#Make the jar more modular
@history_1351_li
#Make the jar more modular
#Drop with restrict (currently cascade is the default)
@history_1352_li
#Drop with restrict (currently cascade is the default)
#JSON parser and functions
@history_1353_li
#JSON parser and functions
#Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
@history_1354_li
#Option for Java functions: constant/isDeterministic to allow early evaluation when all parameters are constant
#Automatic collection of statistics (auto ANALYZE)
@history_1355_li
#Automatic collection of statistics (auto ANALYZE)
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
@history_1356_li
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
#Copy database: Tool with config GUI and batch mode, extensible (example: compare)
@history_1357_li
#Copy database: Tool with config GUI and batch mode, extensible (example: compare)
#Document, implement tool for long running transactions using user defined compensation statements
@history_1358_li
#Document, implement tool for long running transactions using user defined compensation statements
#Support SET TABLE DUAL READONLY
@history_1359_li
#Support SET TABLE DUAL READONLY
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
@history_1360_li
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
#Don't write stack traces for common exceptions like duplicate key to the log by default
@history_1361_li
#Don't write stack traces for common exceptions like duplicate key to the log by default
#Setting for MAX_QUERY_TIME (default no limit?)
@history_1362_li
#Setting for MAX_QUERY_TIME (default no limit?)
#GCJ: what is the state now?
@history_1363_li
#GCJ: what is the state now?
#Convert large byte[]/Strings to streams in the JDBC API (asap).
@history_1364_li
#Convert large byte[]/Strings to streams in the JDBC API (asap).
#Use Janino to convert Java to C++
@history_1365_li
#Use Janino to convert Java to C++
#Reduce disk space usage (Derby uses less disk space?)
@history_1366_li
#Reduce disk space usage (Derby uses less disk space?)
#Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
@history_1367_li
#Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
#Optimization: Log compression
@history_1368_li
#Optimization: Log compression
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
@history_1369_li
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: Division by zero
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
@history_1370_li
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
#Custom class loader to reload functions on demand
@history_1371_li
#Custom class loader to reload functions on demand
#Test http://mysql-je.sourceforge.net/
@history_1372_li
#Test http://mysql-je.sourceforge.net/
#Close all files when closing the database (including LOB files that are open on the client side)
@history_1373_li
#Close all files when closing the database (including LOB files that are open on the client side)
#Test Connection Pool http://jakarta.apache.org/commons/dbcp
@history_1374_li
#Test Connection Pool http://jakarta.apache.org/commons/dbcp
#Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
@history_1375_li
#Profiler option or profiling tool to find long running and often repeated queries (using DatabaseEventListener API)
#Function to read/write a file from/to LOB
@history_1376_li
#Function to read/write a file from/to LOB
#Allow custom settings (@PATH for RUNSCRIPT for example)
@history_1377_li
#Allow custom settings (@PATH for RUNSCRIPT for example)
#Performance test: read the data (getString) and use column names to get the data
@history_1378_li
#Performance test: read the data (getString) and use column names to get the data
#EXE file: maybe use http://jsmooth.sourceforge.net
@history_1379_li
#EXE file: maybe use http://jsmooth.sourceforge.net
#SELECT ... FOR READ WAIT [maxMillisToWait]
@history_1380_li
#SELECT ... FOR READ WAIT [maxMillisToWait]
#Automatically delete the index file if opening it fails
@history_1381_li
#Automatically delete the index file if opening it fails
#Performance: Automatically build in-memory indexes if the whole table is in memory
@history_1382_li
#Performance: Automatically build in-memory indexes if the whole table is in memory
#H2 Console: The webclient could support more features like phpMyAdmin.
@history_1383_li
#H2 Console: The webclient could support more features like phpMyAdmin.
#The HELP information schema can be directly exposed in the Console
@history_1384_li
#The HELP information schema can be directly exposed in the Console
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
@history_1385_li
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@history_1431_li
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
#Functions with unknown return or parameter data types: serialize / deserialize
@history_1432_li
#Functions with unknown return or parameter data types: serialize / deserialize
#Test if idle TCP connections are closed, and how to disable that
@history_1433_li
#Test if idle TCP connections are closed, and how to disable that
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
@history_1434_li
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
#Auto-Update feature for database, .jar file
@history_1435_li
#Auto-Update feature for database, .jar file
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
@history_1436_li
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
#RANK() and DENSE_RANK(), Partition using OVER()
@history_1437_li
#RANK() and DENSE_RANK(), Partition using OVER()
#ROW_NUMBER (not the same as ROWNUM)
@history_1438_li
#ROW_NUMBER (not the same as ROWNUM)
#Partial indexing (see PostgreSQL)
@history_1439_li
#Partial indexing (see PostgreSQL)
#BUILD should fail if ant test fails
@history_1440_li
#BUILD should fail if ant test fails
#http://rubyforge.org/projects/hypersonic/
@history_1441_li
#http://rubyforge.org/projects/hypersonic/
#DbVisualizer profile for H2
@history_1442_li
#DbVisualizer profile for H2
#Add comparator (x === y) : (x = y or (x is null and y is null))
@history_1443_li
#Add comparator (x === y) : (x = y or (x is null and y is null))
#Try to create trace file even for read only databases
@history_1444_li
#Try to create trace file even for read only databases
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
@history_1445_li
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
#Count on a column that can not be null would be optimized to COUNT(*)
@history_1446_li
#Count on a column that can not be null would be optimized to COUNT(*)
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
@history_1447_li
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
#Backup tool should work with other databases as well
@history_1448_li
#Backup tool should work with other databases as well
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
@history_1449_li
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
#Maybe use Fowler Noll Vo hash function
@history_1450_li
#Maybe use Fowler Noll Vo hash function
#Improved full text search (supports LOBs, reader / tokenizer / filter).
@history_1451_li
#Improved full text search (supports LOBs, reader / tokenizer / filter).
#Performance: Update in-place
@history_1452_li
#Performance: Update in-place
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
@history_1453_li
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@history_1536_li
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
#Support multiple directories (on different hard drives) for the same database
@history_1537_li
#Support multiple directories (on different hard drives) for the same database
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@history_1538_li
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@history_1539_li
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
#GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
@history_1540_li
#GROUP BY and DISTINCT: support large groups (buffer to disk), do not keep large sets in memory
#Support native XML data type
@history_1541_li
#Support native XML data type
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
@history_1542_li
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@history_1543_li
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
#Support materialized views (using triggers)
@history_1544_li
#Support materialized views (using triggers)
#Store dates in local timezone (portability of database files)
@history_1545_li
#Store dates in local timezone (portability of database files)
#Ability to resize the cache array when resizing the cache
@history_1546_li
#Ability to resize the cache array when resizing the cache
#Automatic conversion from WHERE X>10 AND X>20 to X>20
@history_1547_li
#Automatic conversion from WHERE X>10 AND X>20 to X>20
#Time based cache writing (one second after writing the log)
@history_1548_li
#Time based cache writing (one second after writing the log)
#Write a H2 driver for http://db.apache.org/ddlutils/
@history_1549_li
#Write a H2 driver for http://db.apache.org/ddlutils/
#Index usage for REGEXP LIKE.
@history_1550_li
#Index usage for REGEXP LIKE.
#Add a role DBA (like ADMIN).
@history_1551_li
#Add a role DBA (like ADMIN).
#Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
@history_1552_li
#Automatic mode: jdbc:h2:auto: (embedded mode if possible, if not use server mode). Problem: what to do when server stops while others are connected to it.
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
@history_1553_li
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
#Implement INSTEAD OF trigger.
@history_1554_li
#Implement INSTEAD OF trigger.
#Access rights: Finer grained access control (grant access for specific functions)
@history_1555_li
#Access rights: Finer grained access control (grant access for specific functions)
#Support N'text'
@history_1556_li
#Support N'text'
#Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
@history_1557_li
#Support SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger
#Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
@history_1558_li
#Support DESCRIBE like MySQL or Oracle (DESC|DESCRIBE {[schema.]object[@connect_identifier]})
#Set a connection read only (Connection.setReadOnly)
@history_1559_li
#Set a connection read only (Connection.setReadOnly)
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@history_1560_li
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@history_1561_li
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
#Read-only sessions (Connection.setReadOnly)
@history_1562_li
#Read-only sessions (Connection.setReadOnly)
#Support compatibility for jdbc:hsqldb:res:
@history_1563_li
#Support compatibility for jdbc:hsqldb:res:
#In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@history_1564_li
#In the MySQL and PostgreSQL, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
#Provide a simple, lightweight O/R mapping tool
@history_1565_li
#Provide a simple, lightweight O/R mapping tool
#Provide an Java SQL builder with standard and H2 syntax
@history_1566_li
#Provide an Java SQL builder with standard and H2 syntax
#Data compression for in-memory database
@history_1567_li
#Data compression for in-memory database
#Trace: write os, file system, vm,... when opening the database
@history_1568_li
#Trace: write os, file system, vm,... when opening the database
#Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
@history_1569_li
#Trace: write dangerous operations (set log 0,...) in every case (including when opening the database)
#ParameterMetaData should return correct data type where possible (INSERT for example)
@history_1570_li
#ParameterMetaData should return correct data type where possible (INSERT for example)
#Support indexes for views (probably requires materialized views)
@history_1571_li
#Support indexes for views (probably requires materialized views)
#Linked tables that point to the same database should share the connection
@history_1572_li
#Linked tables that point to the same database should share the connection
#Use log for rollback
@history_1573_li
#Use log for rollback
#Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
@history_1574_li
#Document SET SEARCH_PATH, BEGIN, EXECUTE, $ parameters
#Complete Javadocs for ErrorCode messages and add to docs
@history_1575_li
#Complete Javadocs for ErrorCode messages and add to docs
#Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
@history_1576_li
#Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
#Document org.h2.samples.MixedMode
@history_1577_li
#Document org.h2.samples.MixedMode
#Server: use one listener (detect if the request comes from an PG or TCP client)
@history_1578_li
#Server: use one listener (detect if the request comes from an PG or TCP client)
#Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
@history_1579_li
#Store dates as 'local'. Existing files use GMT. Use escape syntax for compatibility)
#Support data type INTERVAL
@history_1580_li
#Support data type INTERVAL
#NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
@history_1581_li
#NATURAL JOIN: MySQL and PostgreSQL don't repeat columns when using SELECT * ...
#Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
@history_1582_li
#Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
#Unnamed private in-memory database (jdbc:h2:mem:) were not 'private' as documented. Fixed.
@~history_1200_h3
#Version 1.0.44 (2007-03-04)
@~history_1201_li
#System sequences (automatically created sequences for IDENTITY or AUTO_INCREMENT columns) are now random (UUIDs) to avoid clashes when merging databases using RUNSCRIPT.
@~history_1217_h3
#Version 1.0.41 (2007-01-30)
@~history_1218_li
#Experimental online backup feature using the SQL statement BACKUP TO 'fileName'. This creates a backup in the form of a zip file. Unlike the SCRIPT TO command, the data tables are not locked.
@~history_1232_h3
#Version 1.0.40 (2007-01-17)
@~history_1233_li
#Setting the collation (SET COLLATOR) was very slow on some systems (up to 24 seconds). Thanks a lot to Martina Nissler for finding this problem!
@~history_1244_h3
#Version 1.0.36 (2007-01-02)
@~history_1245_li
#It was possible to drop the sequence of a temporary tables with DROP ALL OBJECTS, resulting in a null pointer exception afterwards.
@~history_1256_h3
#Version 1.0.25 (2006-08-31)
@~history_1257_li
#In some situations, wide b-tree indexes (with large VARCHAR columns for example) could get corrupted. Fixed.
@~history_1259_h3
#Version 0.9 (2005-12-13)
@~history_1260_li
#First public release.
@~history_1261_h2
ロードマップ
@~history_1262_h3
#Highest Priority
@~history_1263_li
#Improve test code coverage
@~history_1267_h3
#In Version 1.1
@~history_1268_li
#Add version number. Install directory: h2-1.0, jar file: h2-1.0.jar. Micro version: use build number, staring with 1.1.100
