@@ -230,7 +230,7 @@ The MVCC feature allows higher concurrency than using (table level or row level)
To use the MVCC feature, append MVCC=TRUE to the database URL:
@advanced_1077_p
MVCC can not be used at the same time as MULTI_THREADED. The MVCC feature is not fully tested yet.
The MVCC feature is not fully tested yet. The limitations of the MVCC mode are: it can not be used at the same time as MULTI_THREADED; the complete undo log must fit in memory when using multi-version concurrency (the setting MAX_MEMORY_UNDO has no effect).
@advanced_1078_h2
Clustering / High Availability
...
...
@@ -1253,1020 +1253,1029 @@ Change Log
Next Version (unreleased)
@changelog_1002_li
LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1003_li
Views using functions were not re-evaluated when necessary.
JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1004_li
Improved MySQL compatibility for SHOW COLUMNS.
Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1005_li
Improved PostgreSQL compatibility for timestamp literals with timezone.
LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1006_li
Sergi Vladykin translated the error messages to Russian. Thanks a lot!
Views using functions were not re-evaluated when necessary.
@changelog_1007_li
Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1008_li
Issue 101: Rollback of a large transaction could fail.
Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1009_li
Various bugfixes and improvements in the page store mechanism (still experimental).
Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1010_li
The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1011_li
Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
Issue 101: Rollback of a large transaction could fail.
@changelog_1012_li
Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1013_li
Parsing SQL script files is now faster.
The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1014_li
CSV reading is now faster.
Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1015_li
Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1016_li
Parsing SQL script files is now faster.
@changelog_1017_li
CSV reading is now faster.
@changelog_1018_li
SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1016_h2
@changelog_1019_h2
Version 1.1.116 (2009-07-18)
@changelog_1017_li
@changelog_1020_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1018_li
@changelog_1021_li
The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1019_li
@changelog_1022_li
H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1020_li
@changelog_1023_li
ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1021_li
@changelog_1024_li
Creating indexes is now a bit faster.
@changelog_1022_li
@changelog_1025_li
PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1023_li
@changelog_1026_li
PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1024_li
@changelog_1027_li
H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1025_li
@changelog_1028_li
Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1026_li
@changelog_1029_li
New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1027_li
@changelog_1030_li
JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1028_li
@changelog_1031_li
If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1029_li
@changelog_1032_li
Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1030_li
@changelog_1033_li
The Recover tool did not work with .data.db files of the wrong size.
@changelog_1031_li
@changelog_1034_li
Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1032_li
@changelog_1035_li
The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1033_li
@changelog_1036_li
To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1034_h2
@changelog_1037_h2
Version 1.1.115 (2009-06-21)
@changelog_1035_li
@changelog_1038_li
The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1036_li
@changelog_1039_li
ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1037_li
@changelog_1040_li
Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1038_li
@changelog_1041_li
java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1039_li
@changelog_1042_li
H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1040_li
@changelog_1043_li
H2 Console: improved Polish translation.
@changelog_1041_li
@changelog_1044_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1042_li
@changelog_1045_li
The download page now included the SHA1 checksums.
@changelog_1043_li
@changelog_1046_li
Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1044_li
@changelog_1047_li
The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1045_li
@changelog_1048_li
Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1046_li
@changelog_1049_li
Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1047_li
@changelog_1050_li
Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1048_li
@changelog_1051_li
Data types: LONG is now an alias for BIGINT.
@changelog_1049_h2
@changelog_1052_h2
Version 1.1.114 (2009-06-01)
@changelog_1050_li
@changelog_1053_li
ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1051_li
@changelog_1054_li
Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1052_li
@changelog_1055_li
In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1053_li
@changelog_1056_li
Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1054_li
@changelog_1057_li
The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1055_li
@changelog_1058_li
Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1056_h2
@changelog_1059_h2
Version 1.1.113 (2009-05-21)
@changelog_1057_li
@changelog_1060_li
Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1058_li
@changelog_1061_li
JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1059_li
@changelog_1062_li
When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1060_li
@changelog_1063_li
Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1061_li
@changelog_1064_li
MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1062_li
@changelog_1065_li
Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1063_li
@changelog_1066_li
Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1064_li
@changelog_1067_li
Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1065_li
@changelog_1068_li
H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1066_li
@changelog_1069_li
Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1067_h2
@changelog_1070_h2
Version 1.1.112 (2009-05-01)
@changelog_1068_li
@changelog_1071_li
JdbcPreparedStatement.toString() could throw a NullPointerException.
@changelog_1069_li
@changelog_1072_li
EclipseLink: added H2Platform.supportsIdentity().
@changelog_1070_li
@changelog_1073_li
Connection pool: the default login timeout is now 5 minutes.
@changelog_1071_li
@changelog_1074_li
After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1072_li
@changelog_1075_li
More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1073_li
@changelog_1076_li
GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1074_li
@changelog_1077_li
Improved error message when the .lock.db file modification time is in the future.
@changelog_1075_li
@changelog_1078_li
The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1076_li
@changelog_1079_li
Running code coverage is now automated.
@changelog_1077_li
@changelog_1080_li
A file system implementation can now be registered using FileSystem.register.
@changelog_1078_li
@changelog_1081_li
The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1079_h2
@changelog_1082_h2
Version 1.1.111 (2009-04-10)
@changelog_1080_li
@changelog_1083_li
In-memory databases can now run inside the Google App Engine.
@changelog_1081_li
@changelog_1084_li
Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1082_li
@changelog_1085_li
The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1083_li
@changelog_1086_li
The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1084_li
@changelog_1087_li
Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1085_li
@changelog_1088_li
The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
@changelog_1086_h2
@changelog_1089_h2
Version 1.1.110 (2009-04-03)
@changelog_1087_li
@changelog_1090_li
Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1088_li
@changelog_1091_li
The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
@changelog_1089_li
@changelog_1092_li
The data type of a SUBSTRING method was wrong.
@changelog_1090_li
@changelog_1093_li
ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1091_li
@changelog_1094_li
H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1092_li
@changelog_1095_li
Improved Javadoc navigation (similar to Scaladoc).
@changelog_1093_li
@changelog_1096_li
H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1094_li
@changelog_1097_li
DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1095_li
@changelog_1098_li
The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1096_li
@changelog_1099_li
Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1097_li
@changelog_1100_li
Improved OSGi support.
@changelog_1098_li
@changelog_1101_li
Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1099_li
@changelog_1102_li
The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1100_li
@changelog_1103_li
Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1101_li
@changelog_1104_li
CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1102_li
@changelog_1105_li
DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1103_li
@changelog_1106_li
Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1104_li
@changelog_1107_li
JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1105_li
@changelog_1108_li
Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1106_li
@changelog_1109_li
The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1107_li
@changelog_1110_li
More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1108_li
@changelog_1111_li
Linked tables to SQLite database can now be created.
@changelog_1109_li
@changelog_1112_li
Nested IN(IN(...)) didn't work.
@changelog_1110_li
@changelog_1113_li
NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
@changelog_1111_h2
@changelog_1114_h2
Version 1.1.109 (2009-03-14)
@changelog_1112_li
@changelog_1115_li
The optimization for IN(...) is now only used if comparing a column with an index.
@changelog_1113_li
@changelog_1116_li
User defined functions can now be deterministic (see CREATE ALIAS documentation).
@changelog_1114_li
@changelog_1117_li
Multiple nested queries in the FROM clause with parameters did not always work.
@changelog_1115_li
@changelog_1118_li
When converting CLOB to BINARY, each character resulted in one byte. Now, the text is parsed as a hex as when converting VARCHAR.
@changelog_1116_li
@changelog_1119_li
New experimental NIO storage mechanism with both FileChannel and memory mapped files. To use it, use the file name prefix nio: or nioMapped: as in jdbc:h2:nio:~/test. So far it looks like NIO storage is faster on Mac OS but slower on some Windows systems. Thanks a lot to Jan Kotek for the patch!
@changelog_1117_li
@changelog_1120_li
The functions BITOR, BITAND, BITXOR, and MOD now accept and return BIGINT instead of INT.
@changelog_1118_li
@changelog_1121_li
Could not use the same linked table multiple times in the same query.
@changelog_1119_li
@changelog_1122_li
Bugs in the server-less multi-connection mode have been fixed.
@changelog_1120_li
@changelog_1123_li
Column names could not be named "UNIQUE" (with the quotes).
@changelog_1121_li
@changelog_1124_li
New system function TRANSACTION_ID() to get the current transaction identifier for a session.
@changelog_1122_h2
@changelog_1125_h2
Version 1.1.108 (2009-02-28)
@changelog_1123_li
@changelog_1126_li
When the shutdown hook closed the database, the last log file was deleted too early. This could cause uncommitted changes to be persisted. In some cases, this could cause data corruption.
@changelog_1124_li
@changelog_1127_li
JdbcConnectionPool: it was possible to set a negative connection pool size.
@changelog_1125_li
@changelog_1128_li
Fulltext search did not support table names with a backslash.
@changelog_1126_li
@changelog_1129_li
The internal IntArray class did not work correctly when initialized with a zero length array.
@changelog_1127_li
@changelog_1130_li
The H2 Console web application (war file) did only support ASCII characters. Now UTF-8 is supported.
@changelog_1128_li
@changelog_1131_li
DATEADD does no longer require that the argument is a timestamp.
@changelog_1129_li
@changelog_1132_li
The database file locking mechanism didn't work correctly on Mac OS.
@changelog_1130_li
@changelog_1133_li
Some built-in functions reported the wrong precision, scale, and display size.
@changelog_1131_li
@changelog_1134_li
MySQL compatibility for CREATE TABLE is improved (UNSIGNED, KEY).
@changelog_1132_li
@changelog_1135_li
Recovery did not work if there were more than 255 lobs stored as files.
@changelog_1133_li
@changelog_1136_li
New experimental mode to support multiple read-write connections without starting a server. To enable this mode, append ;FILE_LOCK=SERIALIZED;OPEN_NEW=TRUE to the database URL. Don't expect high performance when multiple concurrent writers.
@changelog_1134_li
@changelog_1137_li
In a web application, the database classes are not unloaded if a connection is open. This may cause out of memory when re-deploying a web application. The DbStarter is changed to close all connections to the configured database (by executing SHUTDOWN).
@changelog_1135_li
@changelog_1138_li
The WebServlet did not close the database when un-deploying the web application.
@changelog_1136_li
@changelog_1139_li
The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1137_li
@changelog_1140_li
If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1138_li
@changelog_1141_li
Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1139_li
@changelog_1142_li
Improved exception message when connecting to a just started server fails.
@changelog_1140_li
@changelog_1143_li
Connection.isValid is a bit faster.
@changelog_1141_li
@changelog_1144_li
H2 Console: the autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1142_li
@changelog_1145_li
When restarting a web application in Tomcat, an exception was thrown sometimes. In most cases this was a NullPointerException. A workaround in H2 has been implemented. The root cause of the problem is now documented in the FAQ: Tomcat sets all static fields (final or non-final) to null when unloading a web application. A workaround is to put the h2.jar in the lib directory, or set the system property org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES to false.
@changelog_1143_h2
@changelog_1146_h2
Version 1.1.107 (2009-01-24)
@changelog_1144_li
@changelog_1147_li
Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1145_li
@changelog_1148_li
The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1146_li
@changelog_1149_li
When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1147_li
@changelog_1150_li
In versions 1.1.105 and 1.1.106, encrypted script files of earlier versions could not be processed. This is now again possible. The problem was that such script files were stored in a special format (STORAGE=TEXT) but support for this format was removed in version 1.1.105.
@changelog_1148_li
@changelog_1151_li
Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1149_h2
@changelog_1152_h2
Version 1.1.106 (2009-01-04)
@changelog_1150_li
@changelog_1153_li
Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1151_li
@changelog_1154_li
CREATE DOMAIN: built-in data types can now only be changed if no tables exist.
@changelog_1152_li
@changelog_1155_li
Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1153_li
@changelog_1156_li
DatabaseMetaData.getPrimaryKeys: the column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1154_li
@changelog_1157_li
Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1155_li
@changelog_1158_li
Views with IN(..) that used a view itself did not work.
@changelog_1156_li
@changelog_1159_li
Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1157_li
@changelog_1160_li
The license change a bit: so far the license was modified to say 'Swiss law'. This is now changed back to the original 'US law'. This was requested by a user, and I don't see a problem.
@changelog_1158_li
@changelog_1161_li
Constraints for local temporary tables now session scoped. So far they were global. Thanks a lot to Eric Faulhaber for finding and fixing this problem!
@changelog_1159_li
@changelog_1162_li
When using the auto-server mode, and if the lock file was modified in the future, the wrong exception was thrown ('Connection is broken' instead of 'Error opening database: lock file modified in the future').
@changelog_1160_h2
@changelog_1163_h2
Version 1.1.105 (2008-12-19)
@changelog_1161_li
@changelog_1164_li
The setting STORAGE=TEXT is no longer supported.
@changelog_1162_li
@changelog_1165_li
Deleting a database using the tool DeleteDbFiles deleted LOB files of other databases in the same directory.
@changelog_1163_li
@changelog_1166_li
When used in a subquery, LIKE and IN(..) did not work correctly sometimes.
@changelog_1164_li
@changelog_1167_li
The fulltext search documentation has been improved.
@changelog_1165_li
@changelog_1168_li
ARRAY_GET returned the wrong data type (ARRAY). Now it returns VARCHAR.
@changelog_1166_li
@changelog_1169_li
Natural join: the joined columns are not repeated any more when using SELECT *.
@changelog_1167_li
@changelog_1170_li
User defined aggregate functions: the method getType expected internal data types instead of SQL types.
@changelog_1168_li
@changelog_1171_li
User defined aggregate functions did not work if there was no group by expression.
@changelog_1169_li
@changelog_1172_li
MySQL compatibility: support for := assignment as in @sum:=@sum+x
@changelog_1170_li
@changelog_1173_li
INSERT INTO TEST(SELECT * FROM TEST) is now supported.
@changelog_1171_li
@changelog_1174_li
Each session threw an invisible exception when garbage collected.
@changelog_1172_li
@changelog_1175_li
Foreign key constraints that refer to a quoted column did not work.
@changelog_1173_li
@changelog_1176_li
New meta data column INFORMATION_SCHEMA.TABLES.LAST_MODIFICATION to get the table modification counter.
@changelog_1174_li
@changelog_1177_li
Shell: line comments didn't work correctly.
@changelog_1175_li
@changelog_1178_li
H2 Console: columns are now listed for up to 500 tables instead of 100.
@changelog_1176_li
@changelog_1179_li
H2 Console: Cmd+Enter executes the current statement, Alt+Space for autocomplete.
@changelog_1177_li
@changelog_1180_li
JaQu: the maximum length of a column can now be defined using maxLength. For an example, see Product.java (maxLength(category, 255)).
@changelog_1178_li
@changelog_1181_li
R&\#305;dvan A&\#287;ar has completed the Turkish translation of the H2 Console. Thanks a lot!
@changelog_1179_h2
@changelog_1182_h2
Version 1.1.104 (2008-11-28)
@changelog_1180_li
@changelog_1183_li
If a query that was used like a table contained group by and was ordered by an expression that is not in the column list, an exception was thrown.
@changelog_1181_li
@changelog_1184_li
JaQu: tables are now auto-created when running a query.
@changelog_1182_li
@changelog_1185_li
The optimizer had problems with function tables (for example CSVREAD and FTL_SEARCH). A new system property h2.estimatedFunctionTableRows (default 1000) defines how many rows can be expected in the table.
@changelog_1183_li
@changelog_1186_li
The function SUM could overflow when using large values. It returns now a data type that is safe.
@changelog_1184_li
@changelog_1187_li
The function AVG could overflow when using large values. Fixed.
@changelog_1185_li
@changelog_1188_li
The emergency reserve file has been removed. It didn't provide an appropriate solution for the problem. It is still possible for an application to detect and deal with the low disk space problem (deleting temporary files for example) using DatabaseEventListener.diskSpaceIsLow, but this method is now always called with stillAvailable=0.
@changelog_1186_li
@changelog_1189_li
Build: JAVA_HOME is now automatically detected on Mac OS X.
@changelog_1187_li
@changelog_1190_li
Testing for local connections was very slow on some systems.
@changelog_1188_li
@changelog_1191_li
The cache memory usage calculation is more conservative.
@changelog_1189_li
@changelog_1192_li
Allocating space got slower and slower the larger the database.
@changelog_1190_li
@changelog_1193_li
ALTER TABLE ALTER COLUMN could throw the wrong exception in the last version (Table not found).
@changelog_1191_li
@changelog_1194_li
Updatable result sets: the key columns can now be updated.
@changelog_1192_li
@changelog_1195_li
The H2DatabaseProvider for ActiveObjects is now included in the tools section.
@changelog_1193_li
@changelog_1196_li
The H2Platform for Oracle Toplink Essential has been improved a bit.
@changelog_1194_li
@changelog_1197_li
The Windows service to start H2 didn't work in version 1.1.
@changelog_1195_li
@changelog_1198_li
File systems with a maximum file size (for example FAT) are now supported using the file prefix 'split:'. In this case the files are split in parts of 1 GB. Example URL: jdbc:h2:split:~/db/test. If you want to split into parts of 1 MB, use jdbc:h2:split:20:~/db/test (the part size is 1 << x, the default is 30 meaning 1 GB).
@changelog_1196_li
@changelog_1199_li
The database now tries to detect if the classloader or virtual machine has almost shut down by checking if static final variables are set to null. This should help reduce exceptions when stopping the web application.
@changelog_1197_li
@changelog_1200_li
Compatibility for MS SQL Server DATEDIFF(YYYY, .., ..)
@changelog_1198_li
@changelog_1201_li
ResultSet.getObject for CLOB or BLOB will return a java.sql.Clob / java.sql.Blob object instead of a java.io.Reader / java.io.InputStream as in version 1.0. This behavior can be changed using the system property h2.returnLobObjects (true by default for version 1.1).
@changelog_1199_li
@changelog_1202_li
The interface CloseListener has a new method 'remove' that is called when the trigger is dropped.
@changelog_1200_li
@changelog_1203_li
Fulltext search: there was a memory leak when creating and dropping fulltext indexes in a loop.
@changelog_1201_h2
@changelog_1204_h2
Version 1.1.103 (2008-11-07)
@changelog_1202_li
@changelog_1205_li
Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1203_li
@changelog_1206_li
Date values that match the daylight saving time end were not allowed in times zones were the daylight saving time ends at midnight, for years larger than 2037. Example: timezone Brasilia, date 2042-10-12. This is a problem of Java, however a workaround is implemented in H2 that solves most problems (except the problems of java.util.Date itself).
@changelog_1204_li
@changelog_1207_li
ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1205_li
@changelog_1208_li
Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1206_li
@changelog_1209_li
New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1207_li
@changelog_1210_li
Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
@changelog_1208_li
@changelog_1211_li
The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1209_li
@changelog_1212_li
Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1210_li
@changelog_1213_li
Less heap memory is needed when multiple databases are open at the same time: the memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
@changelog_1211_li
@changelog_1214_li
New system property h2.browser to set the browser to use.
@changelog_1212_li
@changelog_1215_li
To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1213_h2
@changelog_1216_h2
Version 1.1.102 (2008-10-24)
@changelog_1214_li
@changelog_1217_li
The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1215_li
@changelog_1218_li
There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1216_li
@changelog_1219_li
SET LOG 2 was not effective if executed after opening the database.
@changelog_1217_li
@changelog_1220_li
Translating the H2 Console is now simpler.
@changelog_1218_li
@changelog_1221_li
Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1219_li
@changelog_1222_li
In-memory databases don't write LOBs to files any longer.
@changelog_1220_li
@changelog_1223_li
Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1221_li
@changelog_1224_li
ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1222_li
@changelog_1225_li
Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1223_h2
@changelog_1226_h2
Version 1.1.101 (2008-10-17)
@changelog_1224_li
@changelog_1227_li
Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1225_li
@changelog_1228_li
Queries with more than 10 tables are now faster.
@changelog_1226_li
@changelog_1229_li
Opening a connection with AUTO_SERVER=TRUE is now fast when the database is already open in another process (less than 0.01 seconds instead of 2 seconds).
@changelog_1227_li
@changelog_1230_li
IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1228_li
@changelog_1231_li
The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1229_li
@changelog_1232_li
Linked tables: the automatic connection sharing didn't work. Actually the system property h2.shareLinkedConnections was working in the opposite direction: it was disabled when set to true. Now it works as expected.
@changelog_1230_li
@changelog_1233_li
Opening large database is now faster.
@changelog_1231_li
@changelog_1234_li
New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1232_li
@changelog_1235_li
The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1233_li
@changelog_1236_li
Unset parameters were not detected when the query was re-compiled.
@changelog_1234_li
@changelog_1237_li
New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1235_li
@changelog_1238_li
The date functions DAYOFYEAR, DAYOFMONTH, DAYOFWEEK are now called DAY_OF_YEAR, DAY_OF_MONTH, DAY_OF_WEEK (the old names still work).
@changelog_1236_li
@changelog_1239_li
An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1237_li
@changelog_1240_li
Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1238_li
@changelog_1241_li
Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1239_li
@changelog_1242_li
The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1240_li
@changelog_1243_li
Fulltext search: new method FT_DROP_INDEX.
@changelog_1241_li
@changelog_1244_li
The optimization to group using an index didn't work in some cases in version 1.1 (see also system property h2.optimizeGroupSorted).
@changelog_1242_li
@changelog_1245_li
OSGi meta data is included in the manifest file. An OSGi BundleActivator is included: it loads the database driver when starting the bundle, and unloads it when stopping the bundle.
@changelog_1243_li
@changelog_1246_li
The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1244_li
@changelog_1247_li
For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1245_li
@changelog_1248_li
In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1246_li
@changelog_1249_li
After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1247_li
@changelog_1250_li
Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1248_li
@changelog_1251_li
RUNSCRIPT no longer uses a temporary file.
@changelog_1249_li
@changelog_1252_li
New system table INFORMATION_SCHEMA.SESSION_STATE containing the SQL statements that make up the session state. The list currently contains variables (SET @..) and local temporary tables (without data).
@changelog_1250_li
@changelog_1253_li
After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1251_li
@changelog_1254_li
The build didn't work if the directory temp didn't exist before.
@changelog_1252_li
@changelog_1255_li
New system property h2.maxReconnect (default 3) to limit the number of re-connects for the same SQL statement (this is usually only important for SHUTDOWN).
@changelog_1253_li
@changelog_1256_li
WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1254_li
@changelog_1257_li
Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1255_h2
@changelog_1258_h2
Version 1.1.100 (2008-10-04)
@changelog_1256_li
@changelog_1259_li
In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1257_li
@changelog_1260_li
The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1258_li
@changelog_1261_li
The H2 Console tool now supports command line options to start things separately.
@changelog_1259_li
@changelog_1262_li
Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1260_li
@changelog_1263_li
Connections from a local address other than 'localhost' were not allowed if remote connections were disabled. This was always a problem, but only got visible in the last release because the server no longer connects to 'localhost' if networked.
@changelog_1261_li
@changelog_1264_li
The h2console.war can now be built using the Java build.
@changelog_1262_li
@changelog_1265_li
By default, databases are shared in the same process. For read-only databases this causes unnecessary synchronization, but safes memory. If you want that each connection opens its own database, append ;OPEN_NEW=TRUE to the database URL.
@changelog_1263_li
@changelog_1266_li
New auto-reconnect feature will cause the JDBC driver to reconnect to the database if the connection is lost. To enable, append ;AUTO_RECONNECT=TRUE to the database URL. This is specially helpful when using AUTO_SERVER. AUTO_SERVER automatically uses auto-reconnect.
@changelog_1264_li
@changelog_1267_li
CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1265_li
@changelog_1268_li
The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1266_li
@changelog_1269_li
Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1267_h2
@changelog_1270_h2
Version 1.0.79 (2008-09-26)
@changelog_1268_li
@changelog_1271_li
Linked tables that point to the same database can now share the connection within the same database. Access to the same connection is serialized. To enable this feature, set the system property h2.shareLinkedConnections to true.
@changelog_1269_li
@changelog_1272_li
Multiple processes can now access the same database without having to explicitly start the server. To do that, append ;AUTO_SERVER=TRUE to the database URL. In this case, the server is started automatically if the connection is in embedded mode, and the server mode is used if a server is running. If the process that opened the first connection is closed, the other client need to reconnect (there is no automatic re-connect so far). Remote connections are allowed, but only to this database.
@changelog_1270_li
@changelog_1273_li
The server tool now displays the correct IP address if networked.
@changelog_1271_li
@changelog_1274_li
Can now start a TCP server with port 0 (automatically select a port).
@changelog_1272_li
@changelog_1275_li
Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1273_li
@changelog_1276_li
LINKED TABLE: the schema name can now be set. When multiple tables exist in different schema, and the schema name is not set, an exception is thrown.
@changelog_1274_li
@changelog_1277_li
LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1275_li
@changelog_1278_li
Faster hash code calculation for large binary arrays.
@changelog_1276_li
@changelog_1279_li
Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1277_li
@changelog_1280_li
The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1278_li
@changelog_1281_li
The H2 Console now abbreviates large texts in results.
@changelog_1279_li
@changelog_1282_li
Multiple UNION queries could not be used in derived tables.
@changelog_1280_li
@changelog_1283_li
Linked tables can now be read-only.
@changelog_1281_li
@changelog_1284_li
Temporary linked tables are now supported.
@changelog_1282_li
@changelog_1285_li
It was possible to create tables in read-only databases.
@changelog_1283_li
@changelog_1286_li
SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1284_li
@changelog_1287_li
SET SCHEMA did not work for views.
@changelog_1285_li
@changelog_1288_li
Row level locking for MVCC is now enabled. The exception 'Concurrent update in table ...' is still thrown, but only after the lock timeout.
@changelog_1286_li
@changelog_1289_li
The maximum log file size setting was ignored for large databases.
@changelog_1287_li
@changelog_1290_li
Multi-Version Concurrency (MVCC) may no longer be used when using the multi-threaded kernel feature (MULTI_THREADED). An exception is thrown when trying to connect with both settings. Additional synchronization is required before those features can be used together.
@changelog_1288_li
@changelog_1291_li
The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1289_li
@changelog_1292_li
The system property h2.optimizeInJoin did not work correctly.
@changelog_1290_li
@changelog_1293_li
Conditions such as ID=? AND ID>? were slow.
@changelog_1291_h2
@changelog_1294_h2
Version 1.0.78 (2008-08-28)
@changelog_1292_li
@changelog_1295_li
The documentation no longer uses a frameset (except the Javadocs).
@changelog_1293_li
@changelog_1296_li
When using DB_CLOSE_DELAY, sometimes a NullPointerException is thrown when the database is opened almost at the same time as it is closed automatically. Thanks a lot to Dmitry Pekar for finding this!
@changelog_1294_li
@changelog_1297_li
Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1295_li
@changelog_1298_li
The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1296_li
@changelog_1299_li
The H2 Console replaced an empty user name with a single space.
@changelog_1297_li
@changelog_1300_li
The build target 'build jarSmall' now includes the embedded database.
@changelog_1298_li
@changelog_1301_li
JdbcDataSource now keeps the password in a char array where possible.
@changelog_1299_li
@changelog_1302_li
ResultSet.absolute did not always work with large result sets.
@changelog_1300_li
@changelog_1303_li
Column aliases can now be used in GROUP BY and HAVING.
@changelog_1301_li
@changelog_1304_li
Jason Brittain has contributed MySQL date functions. Thanks a lot! They are not in the h2.jar file currently, but in src/tools/org/h2/mode/FunctionsMySQL.java. To install, add this class to the classpath and call FunctionsMySQL.register(conn) in the Java code.
@changelog_1302_h2
@changelog_1305_h2
Version 1.0.77 (2008-08-16)
@changelog_1303_li
@changelog_1306_li
JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1304_li
@changelog_1307_li
When using remote in-memory databases, large LOB objects did not work.
@changelog_1305_li
@changelog_1308_li
Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1306_li
@changelog_1309_li
Opening a large database was slow if there was a problem opening the previous time.
@changelog_1307_li
@changelog_1310_li
NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1308_li
@changelog_1311_li
CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1309_li
@changelog_1312_li
Support a comma before closing a list, as in: create table test(id int,)
@changelog_1310_li
@changelog_1313_li
MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1311_li
@changelog_1314_li
DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1312_li
@changelog_1315_li
Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1313_li
@changelog_1316_li
ResultSet.setFetchSize is now supported.
@changelog_1314_li
@changelog_1317_li
It has been reported that when using Install4j on some Linux systems and enabling the 'pack200' option, the h2.jar becomes corrupted by the install process, causing application failure. A workaround is to add an empty file h2.jar.nopack next to the h2.jar file. The reason for this problem is not known.
@changelog_1315_h2
@changelog_1318_h2
Version 1.0.76 (2008-07-27)
@changelog_1316_li
@changelog_1319_li
The comment of a domain (user defined data type) is now used as the default column comment when creating a column with this domain.
@changelog_1317_li
@changelog_1320_li
Invalid database names are now detected and a better error message is thrown.
@changelog_1318_li
@changelog_1321_li
ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1319_li
@changelog_1322_li
Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1320_li
@changelog_1323_li
There is a problem with Hibernate when using Boolean columns. A patch for Hibernate has been submitted at http://opensource.atlassian.com/projects/hibernate/browse/HHH-3401
@changelog_1321_li
@changelog_1324_li
ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1322_li
@changelog_1325_li
H2 Console: the progress display when opening a database has been improved.
@changelog_1323_li
@changelog_1326_li
The error message when the server doesn't start has been improved.
@changelog_1324_li
@changelog_1327_li
Key values can now be changed in updatable result sets.
@changelog_1325_li
@changelog_1328_li
Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1326_li
@changelog_1329_li
Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1327_li
@changelog_1330_li
The database file was growing after deleting many rows, and after large update operations.
@changelog_1328_h2
@changelog_1331_h2
Version 1.0.75 (2008-07-14)
@changelog_1329_li
@changelog_1332_li
Multi version concurrency (MVCC): when a row was updated or deleted, but this change was rolled back, the row was not visible by other sessions if no index was used to access it. Fixed.
@changelog_1330_li
@changelog_1333_li
Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1331_li
@changelog_1334_li
The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1332_li
@changelog_1335_li
Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1333_li
@changelog_1336_li
Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1334_li
@changelog_1337_li
When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1335_li
@changelog_1338_li
Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1336_li
@changelog_1339_li
Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1337_li
@changelog_1340_li
The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1338_li
@changelog_1341_li
The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1339_li
@changelog_1342_li
The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1340_li
@changelog_1343_li
Stopping a WebServer didn't always work. Fixed.
@download_1000_h1
...
...
@@ -4489,63 +4498,66 @@ Supporters
@history_1024_p
Many thanks for those who helped by finding and reporting bugs, gave valuable feedback, spread the word and have translated this project. Also many thanks to the donors who contributed via PayPal:
@history_1025_li
Fyodor Kupolov, Denmark
@history_1026_a
@history_1025_a
SkyCash, Poland
@history_1027_li
@history_1026_li
Donald Bleyl, USA
@history_1028_li
@history_1027_li
lumber-mill.co.jp, Japan
@history_1029_li
@history_1028_li
Frank Berger, Germany
@history_1030_li
@history_1029_li
Ashwin Jayaprakash, USA
@history_1031_li
@history_1030_li
Florent Ramiere, France
@history_1032_li
@history_1031_li
Jun Iyama, Japan
@history_1033_li
@history_1032_li
Antonio Casqueiro, Portugal
@history_1034_li
@history_1033_li
Oliver Computing LLC, USA
@history_1035_li
@history_1034_li
Harpal Grover Consulting Inc., USA
@history_1036_li
@history_1035_li
Elisabetta Berlini, Italy
@history_1037_li
@history_1036_li
William Gilbert, USA
@history_1038_li
@history_1037_li
Antonio Dieguez, Chile
@history_1039_a
@history_1038_a
Ontology Works, USA
@history_1040_li
@history_1039_li
Pete Haidinyak, USA
@history_1041_li
@history_1040_li
William Osmond, USA
@history_1042_li
@history_1041_li
Joachim Ansorg, Germany
@history_1043_li
@history_1042_li
Oliver Soerensen, Germany
@history_1043_li
Christos Vasilakis, Greece
@history_1044_li
Fyodor Kupolov, Denmark
@installation_1000_h1
Installation
...
...
@@ -6221,7 +6233,7 @@ Application Profiling
Database Profiling
@performance_1005_a
Performance Tuning
Database Performance Tuning
@performance_1006_a
Fast Database Import
...
...
@@ -7460,36 +7472,48 @@ If a table has multiple indexes, sometimes more than one index could be used. Ex
The SQL statement ANALYZE can be used to automatically estimate the selectivity of the columns in the tables. This command should be run from time to time to improve the query plans generated by the optimizer.
@performance_1418_h3
Optimization Examples
In-Memory (Hash) Indexes
@performance_1419_p
Using in-memory indexes, specially in-memory hash indexes, can speed up queries and data manipulation.
@performance_1420_p
In-memory indexes are automatically used for in-memory databases, but can also be created for persistent databases using <code>CREATE MEMORY TABLE</code> . In many cases, the rows itself will also be kept in-memory. Please note this may cause memory problems for large tables.
@performance_1421_p
In-memory hash indexes are backed by a hash table and are usually faster than regular indexes. However, hash indexes only supports direct lookup (WHERE ID = ?) but not range scan (WHERE ID < ?). To use hash indexes, use HASH as in: <code>CREATE UNIQUE HASH INDEX</code> and <code>CREATE TABLE ...(ID INT PRIMARY KEY HASH,...)</code> .
@performance_1422_h3
Optimization Examples
@performance_1423_p
See <code>src/test/org/h2/samples/optimizations.sql</code> for a few examples of queries that benefit from special optimizations built into the database.
@performance_1420_h3
@performance_1424_h3
Cache Size and Type
@performance_1421_p
@performance_1425_p
By default the cache size of H2 is quite small. Consider using a larger cache size, or enable the second level soft reference cache. See also <a href="features.html#cache_settings">Cache Settings</a> .
@performance_1422_h2
@performance_1426_h2
Fast Database Import
@performance_1423_p
@performance_1427_p
To speed up large imports, consider using the following options temporarily:
@performance_1424_li
@performance_1428_li
SET CACHE_SIZE (a large cache is faster)
@performance_1425_li
@performance_1429_li
SET LOCK_MODE 0 (disable locking)
@performance_1426_li
@performance_1430_li
SET LOG 0 (disable the transaction log)
@performance_1427_li
@performance_1431_li
SET UNDO_LOG 0 (disable the session undo log)
@performance_1428_p
@performance_1432_p
These options can be set in the database URL: <code>jdbc:h2:~/test;CACHE_SIZE=65536;LOCK_MODE=0;LOG=0;UNDO_LOG=0</code> . Most of those options are not recommended for regular use, that means you need to reset them after use.
@quickstart_1000_h1
...
...
@@ -8531,297 +8555,300 @@ Support GRANT SELECT, UPDATE ON *.
Test Eclipse DTP.
@roadmap_1313_li
H2 Console: autocomplete: keep the previous setting
Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1314_li
MySQL, MS SQL Server compatibility: support case sensitive (mixed case) identifiers without quotes.
H2 Console: autocomplete: keep the previous setting
@roadmap_1315_li
executeBatch: option to stop at the first failed statement.
MySQL, MS SQL Server compatibility: support case sensitive (mixed case) identifiers without quotes.
@roadmap_1316_li
Implement OLAP features as described here: http://www.devx.com/getHelpOn/10MinuteSolution/16573/0/page/5
executeBatch: option to stop at the first failed statement.
@roadmap_1317_li
Support Oracle ROWID (unique identifier for each row).
Implement OLAP features as described here: http://www.devx.com/getHelpOn/10MinuteSolution/16573/0/page/5
@roadmap_1318_li
Server mode: improve performance for batch updates.
Support Oracle ROWID (unique identifier for each row).
@roadmap_1319_li
Applets: support read-only databases in a zip file (accessed as a resource).
Server mode: improve performance for batch updates.
@roadmap_1320_li
Long running queries / errors / trace system table.
Applets: support read-only databases in a zip file (accessed as a resource).
@roadmap_1321_li
H2 Console should support JaQu directly.
Long running queries / errors / trace system table.
@roadmap_1322_li
H2 Console: support single file upload and directory download (optional).
H2 Console should support JaQu directly.
@roadmap_1323_li
Document FTL_SEARCH, FTL_SEARCH_DATA.
H2 Console: support single file upload and directory download (optional).
@roadmap_1324_li
Sequences: CURRVAL should be session specific. Compatibility with PostgreSQL.
Document FTL_SEARCH, FTL_SEARCH_DATA.
@roadmap_1325_li
Support DatabaseMetaData.insertsAreDetected: updatable result sets should detect inserts.
Sequences: CURRVAL should be session specific. Compatibility with PostgreSQL.
@roadmap_1326_li
Auto-server: add option to define the IP address range or list.
Support DatabaseMetaData.insertsAreDetected: updatable result sets should detect inserts.
@roadmap_1327_li
Index creation only using deterministic functions.
Auto-server: add option to define the IP address range or list.
@roadmap_1328_li
Use http://recaptcha.net somehow to secure the Google Group.
Index creation only using deterministic functions.
@roadmap_1329_li
Support DELETE with TOP or LIMIT. See also: http://dev.mysql.com/doc/refman/5.1/de/delete.html
Use http://recaptcha.net somehow to secure the Google Group.
@roadmap_1330_li
Change the default for NULL || 'x' to return NULL
Support DELETE with TOP or LIMIT. See also: http://dev.mysql.com/doc/refman/5.1/de/delete.html
@roadmap_1331_li
ANALYZE: use a bloom filter for each indexed column to estimate count of distinct values.
Change the default for NULL || 'x' to return NULL
@roadmap_1332_li
ANALYZE: for unique indexes that allow null, count the number of null.
ANALYZE: use a bloom filter for each indexed column to estimate count of distinct values.
@roadmap_1333_li
AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
ANALYZE: for unique indexes that allow null, count the number of null.
@roadmap_1334_li
Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
@roadmap_1335_li
Support TRUNCATE .. CASCADE like PostgreSQL.
Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
@roadmap_1336_li
Support opening a database that is in the classpath, maybe using a new file system.
Support TRUNCATE .. CASCADE like PostgreSQL.
@roadmap_1337_li
Fulltext search: lazy result generation using SimpleRowSource.
Support opening a database that is in the classpath, maybe using a new file system.
@roadmap_1338_li
Support transformation to join for user defined functions, as for IN(SELECT...).
Fulltext search: lazy result generation using SimpleRowSource.
@roadmap_1339_li
Fulltext search: support alternative syntax: WHERE FTL_CONTAINS(name, 'hello').
Support transformation to join for user defined functions, as for IN(SELECT...).
@roadmap_1340_li
MySQL compatibility: support REPLACE, see http://dev.mysql.com/doc/refman/5.1/de/replace.html
Fulltext search: support alternative syntax: WHERE FTL_CONTAINS(name, 'hello').
@roadmap_1341_li
MySQL compatibility: support INSERT INTO table SET column1 = value1, column2 = value2
MySQL compatibility: support REPLACE, see http://dev.mysql.com/doc/refman/5.1/de/replace.html
@roadmap_1342_li
Docs: add a one line description for each functions and SQL statements at the top (in the link section).
MySQL compatibility: support INSERT INTO table SET column1 = value1, column2 = value2
@roadmap_1343_li
Javadoc search: weight for titles should be higher ('random' should list Functions as the best match).
Docs: add a one line description for each functions and SQL statements at the top (in the link section).
@roadmap_1344_li
Replace information_schema tables with regular tables that are automatically re-built when needed. Use indexes.
Javadoc search: weight for titles should be higher ('random' should list Functions as the best match).
@roadmap_1345_li
Support a special trigger on all tables.
Replace information_schema tables with regular tables that are automatically re-built when needed. Use indexes.
@roadmap_1346_li
Delete temporary files or objects using finalize.
Support a special trigger on all tables.
@roadmap_1347_li
Oracle compatibility: support calling 0-parameters functions without parenthesis. Make constants obsolete.
Delete temporary files or objects using finalize.
@roadmap_1348_li
MySQL, HSQLDB compatibility: support where 'a'=1 (not supported by Derby, PostgreSQL)
Oracle compatibility: support calling 0-parameters functions without parenthesis. Make constants obsolete.
@roadmap_1349_li
Allow calling function with no parameters without parenthesis. See http://code.google.com/p/h2database/issues/detail?id=50
MySQL, HSQLDB compatibility: support where 'a'=1 (not supported by Derby, PostgreSQL)
@roadmap_1350_li
CSV: currently # is a line comment and can start at any field. Make it optional.
Allow calling function with no parameters without parenthesis. See http://code.google.com/p/h2database/issues/detail?id=50
@roadmap_1351_li
Add database creation date and time to the database.
CSV: currently # is a line comment and can start at any field. Make it optional.
@roadmap_1352_li
Support ASSERTIONS.
Add database creation date and time to the database.
@roadmap_1353_li
MySQL compatibility: support comparing 1='a'
Support ASSERTIONS.
@roadmap_1354_li
Support PostgreSQL lock modes: http://www.postgresql.org/docs/8.3/static/explicit-locking.html
MySQL compatibility: support comparing 1='a'
@roadmap_1355_li
PostgreSQL compatibility: test DbVisualizer and Squirrel SQL using a new PostgreSQL JDBC driver.
Support PostgreSQL lock modes: http://www.postgresql.org/docs/8.3/static/explicit-locking.html
@roadmap_1356_li
RunScript should be able to read from system in (or quite mode for Shell).
PostgreSQL compatibility: test DbVisualizer and Squirrel SQL using a new PostgreSQL JDBC driver.
@roadmap_1357_li
Natural join: support select x from dual natural join dual.
RunScript should be able to read from system in (or quite mode for Shell).
@roadmap_1358_li
Natural join: somehow support this: select a.x, b.x, x from dual a natural join dual b
Natural join: support select x from dual natural join dual.
@roadmap_1359_li
MySQL compatibility: for auto_increment columns, convert 0 to next value (as when inserting NULL).
Natural join: somehow support this: select a.x, b.x, x from dual a natural join dual b
@roadmap_1360_li
Functions: support hashcode(value); cryptographic and fast
MySQL compatibility: for auto_increment columns, convert 0 to next value (as when inserting NULL).
@roadmap_1361_li
Serialized file lock: support long running queries.
Functions: support hashcode(value); cryptographic and fast
@roadmap_1362_li
Network: use 127.0.0.1 if other addresses don't work.
Serialized file lock: support long running queries.
@roadmap_1363_li
Select for update in mvcc mode: only lock the selected records.
Network: use 127.0.0.1 if other addresses don't work.
@roadmap_1364_li
Support reading JCR data: one table per node type; query table; cache option
Select for update in mvcc mode: only lock the selected records.
@roadmap_1365_li
OSGi: create a sample application, test, document.
Support reading JCR data: one table per node type; query table; cache option
@roadmap_1366_li
help.csv: use complete examples for functions; run as test case.
OSGi: create a sample application, test, document.
@roadmap_1367_li
Re-implement PooledConnection; use a lightweight connection object.
help.csv: use complete examples for functions; run as test case.
@roadmap_1368_li
Doclet: convert tests in javadocs to a java class.
Re-implement PooledConnection; use a lightweight connection object.
@roadmap_1369_li
Doclet: format fields like methods, but support sorting by name and value.
Doclet: convert tests in javadocs to a java class.
@roadmap_1370_li
Doclet: shrink the html files.
Doclet: format fields like methods, but support sorting by name and value.
@roadmap_1371_li
Finer granularity for SLF4J trace - See http://code.google.com/p/h2database/issues/detail?id=62
Doclet: shrink the html files.
@roadmap_1372_li
MySQL compatibility: support REPLACE - See http://code.google.com/p/h2database/issues/detail?id=73
Finer granularity for SLF4J trace - See http://code.google.com/p/h2database/issues/detail?id=62
@roadmap_1373_li
MySQL compatibility: support SET NAMES 'latin1' - See also http://code.google.com/p/h2database/issues/detail?id=56
MySQL compatibility: support REPLACE - See http://code.google.com/p/h2database/issues/detail?id=73
@roadmap_1374_li
MySQL compatibility: DELETE .. FROM .. USING - See http://dev.mysql.com/doc/refman/5.0/en/delete.html
MySQL compatibility: support SET NAMES 'latin1' - See also http://code.google.com/p/h2database/issues/detail?id=56
@roadmap_1375_li
Allow to scan index backwards starting with a value (to better support ORDER BY DESC).
MySQL compatibility: DELETE .. FROM .. USING - See http://dev.mysql.com/doc/refman/5.0/en/delete.html
@roadmap_1376_li
Java Service Wrapper: try http://yajsw.sourceforge.net/
Allow to scan index backwards starting with a value (to better support ORDER BY DESC).
@roadmap_1377_li
Batch parameter for INSERT, UPDATE, and DELETE, and commit after each batch. See also MySQL DELETE.
Java Service Wrapper: try http://yajsw.sourceforge.net/
@roadmap_1378_li
MySQL compatibility: support ALTER TABLE .. MODIFY COLUMN.
Batch parameter for INSERT, UPDATE, and DELETE, and commit after each batch. See also MySQL DELETE.
@roadmap_1379_li
Use a lazy and auto-close input stream (open resource when reading, close on eof).
MySQL compatibility: support ALTER TABLE .. MODIFY COLUMN.
@roadmap_1380_li
PostgreSQL compatibility: generate_series.
Use a lazy and auto-close input stream (open resource when reading, close on eof).
#To use the MVCC feature, append MVCC=TRUE to the database URL:
@advanced_1077_p
#MVCC can not be used at the same time as MULTI_THREADED. The MVCC feature is not fully tested yet.
#The MVCC feature is not fully tested yet. The limitations of the MVCC mode are: it can not be used at the same time as MULTI_THREADED; the complete undo log must fit in memory when using multi-version concurrency (the setting MAX_MEMORY_UNDO has no effect).
@advanced_1078_h2
クラスタリング / 高可用性
...
...
@@ -1253,1020 +1253,1029 @@ Centralリポジトリの利用
#Next Version (unreleased)
@changelog_1002_li
#LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
#New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1003_li
#Views using functions were not re-evaluated when necessary.
#JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1004_li
#Improved MySQL compatibility for SHOW COLUMNS.
#Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1005_li
#Improved PostgreSQL compatibility for timestamp literals with timezone.
#LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1006_li
#Sergi Vladykin translated the error messages to Russian. Thanks a lot!
#Views using functions were not re-evaluated when necessary.
@changelog_1007_li
#Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
#Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1008_li
#Issue 101: Rollback of a large transaction could fail.
#Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1009_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
#Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1010_li
#The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
#Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1011_li
#Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
#Issue 101: Rollback of a large transaction could fail.
@changelog_1012_li
#Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1013_li
#Parsing SQL script files is now faster.
#The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1014_li
#CSV reading is now faster.
#Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1015_li
#Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1016_li
#Parsing SQL script files is now faster.
@changelog_1017_li
#CSV reading is now faster.
@changelog_1018_li
#SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1016_h2
@changelog_1019_h2
#Version 1.1.116 (2009-07-18)
@changelog_1017_li
@changelog_1020_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1018_li
@changelog_1021_li
#The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1019_li
@changelog_1022_li
#H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1020_li
@changelog_1023_li
#ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1021_li
@changelog_1024_li
#Creating indexes is now a bit faster.
@changelog_1022_li
@changelog_1025_li
#PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1023_li
@changelog_1026_li
#PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1024_li
@changelog_1027_li
#H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1025_li
@changelog_1028_li
#Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1026_li
@changelog_1029_li
#New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1027_li
@changelog_1030_li
#JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1028_li
@changelog_1031_li
#If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1029_li
@changelog_1032_li
#Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1030_li
@changelog_1033_li
#The Recover tool did not work with .data.db files of the wrong size.
@changelog_1031_li
@changelog_1034_li
#Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1032_li
@changelog_1035_li
#The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1033_li
@changelog_1036_li
#To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1034_h2
@changelog_1037_h2
#Version 1.1.115 (2009-06-21)
@changelog_1035_li
@changelog_1038_li
#The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1036_li
@changelog_1039_li
#ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1037_li
@changelog_1040_li
#Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1038_li
@changelog_1041_li
#java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1039_li
@changelog_1042_li
#H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1040_li
@changelog_1043_li
#H2 Console: improved Polish translation.
@changelog_1041_li
@changelog_1044_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1042_li
@changelog_1045_li
#The download page now included the SHA1 checksums.
@changelog_1043_li
@changelog_1046_li
#Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1044_li
@changelog_1047_li
#The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1045_li
@changelog_1048_li
#Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1046_li
@changelog_1049_li
#Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1047_li
@changelog_1050_li
#Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1048_li
@changelog_1051_li
#Data types: LONG is now an alias for BIGINT.
@changelog_1049_h2
@changelog_1052_h2
#Version 1.1.114 (2009-06-01)
@changelog_1050_li
@changelog_1053_li
#ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1051_li
@changelog_1054_li
#Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1052_li
@changelog_1055_li
#In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1053_li
@changelog_1056_li
#Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1054_li
@changelog_1057_li
#The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1055_li
@changelog_1058_li
#Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1056_h2
@changelog_1059_h2
#Version 1.1.113 (2009-05-21)
@changelog_1057_li
@changelog_1060_li
#Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1058_li
@changelog_1061_li
#JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1059_li
@changelog_1062_li
#When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1060_li
@changelog_1063_li
#Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1061_li
@changelog_1064_li
#MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1062_li
@changelog_1065_li
#Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1063_li
@changelog_1066_li
#Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1064_li
@changelog_1067_li
#Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1065_li
@changelog_1068_li
#H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1066_li
@changelog_1069_li
#Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1067_h2
@changelog_1070_h2
#Version 1.1.112 (2009-05-01)
@changelog_1068_li
@changelog_1071_li
#JdbcPreparedStatement.toString() could throw a NullPointerException.
#Connection pool: the default login timeout is now 5 minutes.
@changelog_1071_li
@changelog_1074_li
#After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1072_li
@changelog_1075_li
#More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1073_li
@changelog_1076_li
#GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1074_li
@changelog_1077_li
#Improved error message when the .lock.db file modification time is in the future.
@changelog_1075_li
@changelog_1078_li
#The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1076_li
@changelog_1079_li
#Running code coverage is now automated.
@changelog_1077_li
@changelog_1080_li
#A file system implementation can now be registered using FileSystem.register.
@changelog_1078_li
@changelog_1081_li
#The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1079_h2
@changelog_1082_h2
#Version 1.1.111 (2009-04-10)
@changelog_1080_li
@changelog_1083_li
#In-memory databases can now run inside the Google App Engine.
@changelog_1081_li
@changelog_1084_li
#Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1082_li
@changelog_1085_li
#The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1083_li
@changelog_1086_li
#The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1084_li
@changelog_1087_li
#Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1085_li
@changelog_1088_li
#The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
@changelog_1086_h2
@changelog_1089_h2
#Version 1.1.110 (2009-04-03)
@changelog_1087_li
@changelog_1090_li
#Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1088_li
@changelog_1091_li
#The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
@changelog_1089_li
@changelog_1092_li
#The data type of a SUBSTRING method was wrong.
@changelog_1090_li
@changelog_1093_li
#ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1091_li
@changelog_1094_li
#H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1092_li
@changelog_1095_li
#Improved Javadoc navigation (similar to Scaladoc).
@changelog_1093_li
@changelog_1096_li
#H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1094_li
@changelog_1097_li
#DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1095_li
@changelog_1098_li
#The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1096_li
@changelog_1099_li
#Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1097_li
@changelog_1100_li
#Improved OSGi support.
@changelog_1098_li
@changelog_1101_li
#Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1099_li
@changelog_1102_li
#The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1100_li
@changelog_1103_li
#Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1101_li
@changelog_1104_li
#CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1102_li
@changelog_1105_li
#DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1103_li
@changelog_1106_li
#Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1104_li
@changelog_1107_li
#JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1105_li
@changelog_1108_li
#Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1106_li
@changelog_1109_li
#The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1107_li
@changelog_1110_li
#More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1108_li
@changelog_1111_li
#Linked tables to SQLite database can now be created.
@changelog_1109_li
@changelog_1112_li
#Nested IN(IN(...)) didn't work.
@changelog_1110_li
@changelog_1113_li
#NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
@changelog_1111_h2
@changelog_1114_h2
#Version 1.1.109 (2009-03-14)
@changelog_1112_li
@changelog_1115_li
#The optimization for IN(...) is now only used if comparing a column with an index.
@changelog_1113_li
@changelog_1116_li
#User defined functions can now be deterministic (see CREATE ALIAS documentation).
@changelog_1114_li
@changelog_1117_li
#Multiple nested queries in the FROM clause with parameters did not always work.
@changelog_1115_li
@changelog_1118_li
#When converting CLOB to BINARY, each character resulted in one byte. Now, the text is parsed as a hex as when converting VARCHAR.
@changelog_1116_li
@changelog_1119_li
#New experimental NIO storage mechanism with both FileChannel and memory mapped files. To use it, use the file name prefix nio: or nioMapped: as in jdbc:h2:nio:~/test. So far it looks like NIO storage is faster on Mac OS but slower on some Windows systems. Thanks a lot to Jan Kotek for the patch!
@changelog_1117_li
@changelog_1120_li
#The functions BITOR, BITAND, BITXOR, and MOD now accept and return BIGINT instead of INT.
@changelog_1118_li
@changelog_1121_li
#Could not use the same linked table multiple times in the same query.
@changelog_1119_li
@changelog_1122_li
#Bugs in the server-less multi-connection mode have been fixed.
@changelog_1120_li
@changelog_1123_li
#Column names could not be named "UNIQUE" (with the quotes).
@changelog_1121_li
@changelog_1124_li
#New system function TRANSACTION_ID() to get the current transaction identifier for a session.
@changelog_1122_h2
@changelog_1125_h2
#Version 1.1.108 (2009-02-28)
@changelog_1123_li
@changelog_1126_li
#When the shutdown hook closed the database, the last log file was deleted too early. This could cause uncommitted changes to be persisted. In some cases, this could cause data corruption.
@changelog_1124_li
@changelog_1127_li
#JdbcConnectionPool: it was possible to set a negative connection pool size.
@changelog_1125_li
@changelog_1128_li
#Fulltext search did not support table names with a backslash.
@changelog_1126_li
@changelog_1129_li
#The internal IntArray class did not work correctly when initialized with a zero length array.
@changelog_1127_li
@changelog_1130_li
#The H2 Console web application (war file) did only support ASCII characters. Now UTF-8 is supported.
@changelog_1128_li
@changelog_1131_li
#DATEADD does no longer require that the argument is a timestamp.
@changelog_1129_li
@changelog_1132_li
#The database file locking mechanism didn't work correctly on Mac OS.
@changelog_1130_li
@changelog_1133_li
#Some built-in functions reported the wrong precision, scale, and display size.
@changelog_1131_li
@changelog_1134_li
#MySQL compatibility for CREATE TABLE is improved (UNSIGNED, KEY).
@changelog_1132_li
@changelog_1135_li
#Recovery did not work if there were more than 255 lobs stored as files.
@changelog_1133_li
@changelog_1136_li
#New experimental mode to support multiple read-write connections without starting a server. To enable this mode, append ;FILE_LOCK=SERIALIZED;OPEN_NEW=TRUE to the database URL. Don't expect high performance when multiple concurrent writers.
@changelog_1134_li
@changelog_1137_li
#In a web application, the database classes are not unloaded if a connection is open. This may cause out of memory when re-deploying a web application. The DbStarter is changed to close all connections to the configured database (by executing SHUTDOWN).
@changelog_1135_li
@changelog_1138_li
#The WebServlet did not close the database when un-deploying the web application.
@changelog_1136_li
@changelog_1139_li
#The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1137_li
@changelog_1140_li
#If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1138_li
@changelog_1141_li
#Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1139_li
@changelog_1142_li
#Improved exception message when connecting to a just started server fails.
@changelog_1140_li
@changelog_1143_li
#Connection.isValid is a bit faster.
@changelog_1141_li
@changelog_1144_li
#H2 Console: the autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1142_li
@changelog_1145_li
#When restarting a web application in Tomcat, an exception was thrown sometimes. In most cases this was a NullPointerException. A workaround in H2 has been implemented. The root cause of the problem is now documented in the FAQ: Tomcat sets all static fields (final or non-final) to null when unloading a web application. A workaround is to put the h2.jar in the lib directory, or set the system property org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES to false.
@changelog_1143_h2
@changelog_1146_h2
#Version 1.1.107 (2009-01-24)
@changelog_1144_li
@changelog_1147_li
#Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1145_li
@changelog_1148_li
#The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1146_li
@changelog_1149_li
#When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1147_li
@changelog_1150_li
#In versions 1.1.105 and 1.1.106, encrypted script files of earlier versions could not be processed. This is now again possible. The problem was that such script files were stored in a special format (STORAGE=TEXT) but support for this format was removed in version 1.1.105.
@changelog_1148_li
@changelog_1151_li
#Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1149_h2
@changelog_1152_h2
#Version 1.1.106 (2009-01-04)
@changelog_1150_li
@changelog_1153_li
#Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1151_li
@changelog_1154_li
#CREATE DOMAIN: built-in data types can now only be changed if no tables exist.
@changelog_1152_li
@changelog_1155_li
#Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1153_li
@changelog_1156_li
#DatabaseMetaData.getPrimaryKeys: the column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1154_li
@changelog_1157_li
#Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1155_li
@changelog_1158_li
#Views with IN(..) that used a view itself did not work.
@changelog_1156_li
@changelog_1159_li
#Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1157_li
@changelog_1160_li
#The license change a bit: so far the license was modified to say 'Swiss law'. This is now changed back to the original 'US law'. This was requested by a user, and I don't see a problem.
@changelog_1158_li
@changelog_1161_li
#Constraints for local temporary tables now session scoped. So far they were global. Thanks a lot to Eric Faulhaber for finding and fixing this problem!
@changelog_1159_li
@changelog_1162_li
#When using the auto-server mode, and if the lock file was modified in the future, the wrong exception was thrown ('Connection is broken' instead of 'Error opening database: lock file modified in the future').
@changelog_1160_h2
@changelog_1163_h2
#Version 1.1.105 (2008-12-19)
@changelog_1161_li
@changelog_1164_li
#The setting STORAGE=TEXT is no longer supported.
@changelog_1162_li
@changelog_1165_li
#Deleting a database using the tool DeleteDbFiles deleted LOB files of other databases in the same directory.
@changelog_1163_li
@changelog_1166_li
#When used in a subquery, LIKE and IN(..) did not work correctly sometimes.
@changelog_1164_li
@changelog_1167_li
#The fulltext search documentation has been improved.
@changelog_1165_li
@changelog_1168_li
#ARRAY_GET returned the wrong data type (ARRAY). Now it returns VARCHAR.
@changelog_1166_li
@changelog_1169_li
#Natural join: the joined columns are not repeated any more when using SELECT *.
@changelog_1167_li
@changelog_1170_li
#User defined aggregate functions: the method getType expected internal data types instead of SQL types.
@changelog_1168_li
@changelog_1171_li
#User defined aggregate functions did not work if there was no group by expression.
@changelog_1169_li
@changelog_1172_li
#MySQL compatibility: support for := assignment as in @sum:=@sum+x
@changelog_1170_li
@changelog_1173_li
#INSERT INTO TEST(SELECT * FROM TEST) is now supported.
@changelog_1171_li
@changelog_1174_li
#Each session threw an invisible exception when garbage collected.
@changelog_1172_li
@changelog_1175_li
#Foreign key constraints that refer to a quoted column did not work.
@changelog_1173_li
@changelog_1176_li
#New meta data column INFORMATION_SCHEMA.TABLES.LAST_MODIFICATION to get the table modification counter.
@changelog_1174_li
@changelog_1177_li
#Shell: line comments didn't work correctly.
@changelog_1175_li
@changelog_1178_li
#H2 Console: columns are now listed for up to 500 tables instead of 100.
@changelog_1176_li
@changelog_1179_li
#H2 Console: Cmd+Enter executes the current statement, Alt+Space for autocomplete.
@changelog_1177_li
@changelog_1180_li
#JaQu: the maximum length of a column can now be defined using maxLength. For an example, see Product.java (maxLength(category, 255)).
@changelog_1178_li
@changelog_1181_li
#R&\#305;dvan A&\#287;ar has completed the Turkish translation of the H2 Console. Thanks a lot!
@changelog_1179_h2
@changelog_1182_h2
#Version 1.1.104 (2008-11-28)
@changelog_1180_li
@changelog_1183_li
#If a query that was used like a table contained group by and was ordered by an expression that is not in the column list, an exception was thrown.
@changelog_1181_li
@changelog_1184_li
#JaQu: tables are now auto-created when running a query.
@changelog_1182_li
@changelog_1185_li
#The optimizer had problems with function tables (for example CSVREAD and FTL_SEARCH). A new system property h2.estimatedFunctionTableRows (default 1000) defines how many rows can be expected in the table.
@changelog_1183_li
@changelog_1186_li
#The function SUM could overflow when using large values. It returns now a data type that is safe.
@changelog_1184_li
@changelog_1187_li
#The function AVG could overflow when using large values. Fixed.
@changelog_1185_li
@changelog_1188_li
#The emergency reserve file has been removed. It didn't provide an appropriate solution for the problem. It is still possible for an application to detect and deal with the low disk space problem (deleting temporary files for example) using DatabaseEventListener.diskSpaceIsLow, but this method is now always called with stillAvailable=0.
@changelog_1186_li
@changelog_1189_li
#Build: JAVA_HOME is now automatically detected on Mac OS X.
@changelog_1187_li
@changelog_1190_li
#Testing for local connections was very slow on some systems.
@changelog_1188_li
@changelog_1191_li
#The cache memory usage calculation is more conservative.
@changelog_1189_li
@changelog_1192_li
#Allocating space got slower and slower the larger the database.
@changelog_1190_li
@changelog_1193_li
#ALTER TABLE ALTER COLUMN could throw the wrong exception in the last version (Table not found).
@changelog_1191_li
@changelog_1194_li
#Updatable result sets: the key columns can now be updated.
@changelog_1192_li
@changelog_1195_li
#The H2DatabaseProvider for ActiveObjects is now included in the tools section.
@changelog_1193_li
@changelog_1196_li
#The H2Platform for Oracle Toplink Essential has been improved a bit.
@changelog_1194_li
@changelog_1197_li
#The Windows service to start H2 didn't work in version 1.1.
@changelog_1195_li
@changelog_1198_li
#File systems with a maximum file size (for example FAT) are now supported using the file prefix 'split:'. In this case the files are split in parts of 1 GB. Example URL: jdbc:h2:split:~/db/test. If you want to split into parts of 1 MB, use jdbc:h2:split:20:~/db/test (the part size is 1 << x, the default is 30 meaning 1 GB).
@changelog_1196_li
@changelog_1199_li
#The database now tries to detect if the classloader or virtual machine has almost shut down by checking if static final variables are set to null. This should help reduce exceptions when stopping the web application.
@changelog_1197_li
@changelog_1200_li
#Compatibility for MS SQL Server DATEDIFF(YYYY, .., ..)
@changelog_1198_li
@changelog_1201_li
#ResultSet.getObject for CLOB or BLOB will return a java.sql.Clob / java.sql.Blob object instead of a java.io.Reader / java.io.InputStream as in version 1.0. This behavior can be changed using the system property h2.returnLobObjects (true by default for version 1.1).
@changelog_1199_li
@changelog_1202_li
#The interface CloseListener has a new method 'remove' that is called when the trigger is dropped.
@changelog_1200_li
@changelog_1203_li
#Fulltext search: there was a memory leak when creating and dropping fulltext indexes in a loop.
@changelog_1201_h2
@changelog_1204_h2
#Version 1.1.103 (2008-11-07)
@changelog_1202_li
@changelog_1205_li
#Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1203_li
@changelog_1206_li
#Date values that match the daylight saving time end were not allowed in times zones were the daylight saving time ends at midnight, for years larger than 2037. Example: timezone Brasilia, date 2042-10-12. This is a problem of Java, however a workaround is implemented in H2 that solves most problems (except the problems of java.util.Date itself).
@changelog_1204_li
@changelog_1207_li
#ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1205_li
@changelog_1208_li
#Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1206_li
@changelog_1209_li
#New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1207_li
@changelog_1210_li
#Aliases for built-in data types (such as MEDIUMBLOB which is an alias for BLOB) can now be re-mapped to another data type using CREATE DOMAIN. However main built-in data types (such as INTEGER) can not be re-mapped.
@changelog_1208_li
@changelog_1211_li
#The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1209_li
@changelog_1212_li
#Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1210_li
@changelog_1213_li
#Less heap memory is needed when multiple databases are open at the same time: the memory reserve (used to rollback after out of memory) is now global and no longer allocated for each database separately.
@changelog_1211_li
@changelog_1214_li
#New system property h2.browser to set the browser to use.
@changelog_1212_li
@changelog_1215_li
#To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1213_h2
@changelog_1216_h2
#Version 1.1.102 (2008-10-24)
@changelog_1214_li
@changelog_1217_li
#The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1215_li
@changelog_1218_li
#There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1216_li
@changelog_1219_li
#SET LOG 2 was not effective if executed after opening the database.
@changelog_1217_li
@changelog_1220_li
#Translating the H2 Console is now simpler.
@changelog_1218_li
@changelog_1221_li
#Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1219_li
@changelog_1222_li
#In-memory databases don't write LOBs to files any longer.
@changelog_1220_li
@changelog_1223_li
#Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1221_li
@changelog_1224_li
#ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1222_li
@changelog_1225_li
#Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1223_h2
@changelog_1226_h2
#Version 1.1.101 (2008-10-17)
@changelog_1224_li
@changelog_1227_li
#Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1225_li
@changelog_1228_li
#Queries with more than 10 tables are now faster.
@changelog_1226_li
@changelog_1229_li
#Opening a connection with AUTO_SERVER=TRUE is now fast when the database is already open in another process (less than 0.01 seconds instead of 2 seconds).
@changelog_1227_li
@changelog_1230_li
#IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1228_li
@changelog_1231_li
#The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1229_li
@changelog_1232_li
#Linked tables: the automatic connection sharing didn't work. Actually the system property h2.shareLinkedConnections was working in the opposite direction: it was disabled when set to true. Now it works as expected.
@changelog_1230_li
@changelog_1233_li
#Opening large database is now faster.
@changelog_1231_li
@changelog_1234_li
#New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1232_li
@changelog_1235_li
#The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1233_li
@changelog_1236_li
#Unset parameters were not detected when the query was re-compiled.
@changelog_1234_li
@changelog_1237_li
#New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1235_li
@changelog_1238_li
#The date functions DAYOFYEAR, DAYOFMONTH, DAYOFWEEK are now called DAY_OF_YEAR, DAY_OF_MONTH, DAY_OF_WEEK (the old names still work).
@changelog_1236_li
@changelog_1239_li
#An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1237_li
@changelog_1240_li
#Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1238_li
@changelog_1241_li
#Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1239_li
@changelog_1242_li
#The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1240_li
@changelog_1243_li
#Fulltext search: new method FT_DROP_INDEX.
@changelog_1241_li
@changelog_1244_li
#The optimization to group using an index didn't work in some cases in version 1.1 (see also system property h2.optimizeGroupSorted).
@changelog_1242_li
@changelog_1245_li
#OSGi meta data is included in the manifest file. An OSGi BundleActivator is included: it loads the database driver when starting the bundle, and unloads it when stopping the bundle.
@changelog_1243_li
@changelog_1246_li
#The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1244_li
@changelog_1247_li
#For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1245_li
@changelog_1248_li
#In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1246_li
@changelog_1249_li
#After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1247_li
@changelog_1250_li
#Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1248_li
@changelog_1251_li
#RUNSCRIPT no longer uses a temporary file.
@changelog_1249_li
@changelog_1252_li
#New system table INFORMATION_SCHEMA.SESSION_STATE containing the SQL statements that make up the session state. The list currently contains variables (SET @..) and local temporary tables (without data).
@changelog_1250_li
@changelog_1253_li
#After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1251_li
@changelog_1254_li
#The build didn't work if the directory temp didn't exist before.
@changelog_1252_li
@changelog_1255_li
#New system property h2.maxReconnect (default 3) to limit the number of re-connects for the same SQL statement (this is usually only important for SHUTDOWN).
@changelog_1253_li
@changelog_1256_li
#WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1254_li
@changelog_1257_li
#Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1255_h2
@changelog_1258_h2
#Version 1.1.100 (2008-10-04)
@changelog_1256_li
@changelog_1259_li
#In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1257_li
@changelog_1260_li
#The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1258_li
@changelog_1261_li
#The H2 Console tool now supports command line options to start things separately.
@changelog_1259_li
@changelog_1262_li
#Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1260_li
@changelog_1263_li
#Connections from a local address other than 'localhost' were not allowed if remote connections were disabled. This was always a problem, but only got visible in the last release because the server no longer connects to 'localhost' if networked.
@changelog_1261_li
@changelog_1264_li
#The h2console.war can now be built using the Java build.
@changelog_1262_li
@changelog_1265_li
#By default, databases are shared in the same process. For read-only databases this causes unnecessary synchronization, but safes memory. If you want that each connection opens its own database, append ;OPEN_NEW=TRUE to the database URL.
@changelog_1263_li
@changelog_1266_li
#New auto-reconnect feature will cause the JDBC driver to reconnect to the database if the connection is lost. To enable, append ;AUTO_RECONNECT=TRUE to the database URL. This is specially helpful when using AUTO_SERVER. AUTO_SERVER automatically uses auto-reconnect.
@changelog_1264_li
@changelog_1267_li
#CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1265_li
@changelog_1268_li
#The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1266_li
@changelog_1269_li
#Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1267_h2
@changelog_1270_h2
#Version 1.0.79 (2008-09-26)
@changelog_1268_li
@changelog_1271_li
#Linked tables that point to the same database can now share the connection within the same database. Access to the same connection is serialized. To enable this feature, set the system property h2.shareLinkedConnections to true.
@changelog_1269_li
@changelog_1272_li
#Multiple processes can now access the same database without having to explicitly start the server. To do that, append ;AUTO_SERVER=TRUE to the database URL. In this case, the server is started automatically if the connection is in embedded mode, and the server mode is used if a server is running. If the process that opened the first connection is closed, the other client need to reconnect (there is no automatic re-connect so far). Remote connections are allowed, but only to this database.
@changelog_1270_li
@changelog_1273_li
#The server tool now displays the correct IP address if networked.
@changelog_1271_li
@changelog_1274_li
#Can now start a TCP server with port 0 (automatically select a port).
@changelog_1272_li
@changelog_1275_li
#Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1273_li
@changelog_1276_li
#LINKED TABLE: the schema name can now be set. When multiple tables exist in different schema, and the schema name is not set, an exception is thrown.
@changelog_1274_li
@changelog_1277_li
#LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1275_li
@changelog_1278_li
#Faster hash code calculation for large binary arrays.
@changelog_1276_li
@changelog_1279_li
#Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1277_li
@changelog_1280_li
#The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1278_li
@changelog_1281_li
#The H2 Console now abbreviates large texts in results.
@changelog_1279_li
@changelog_1282_li
#Multiple UNION queries could not be used in derived tables.
@changelog_1280_li
@changelog_1283_li
#Linked tables can now be read-only.
@changelog_1281_li
@changelog_1284_li
#Temporary linked tables are now supported.
@changelog_1282_li
@changelog_1285_li
#It was possible to create tables in read-only databases.
@changelog_1283_li
@changelog_1286_li
#SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1284_li
@changelog_1287_li
#SET SCHEMA did not work for views.
@changelog_1285_li
@changelog_1288_li
#Row level locking for MVCC is now enabled. The exception 'Concurrent update in table ...' is still thrown, but only after the lock timeout.
@changelog_1286_li
@changelog_1289_li
#The maximum log file size setting was ignored for large databases.
@changelog_1287_li
@changelog_1290_li
#Multi-Version Concurrency (MVCC) may no longer be used when using the multi-threaded kernel feature (MULTI_THREADED). An exception is thrown when trying to connect with both settings. Additional synchronization is required before those features can be used together.
@changelog_1288_li
@changelog_1291_li
#The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1289_li
@changelog_1292_li
#The system property h2.optimizeInJoin did not work correctly.
@changelog_1290_li
@changelog_1293_li
#Conditions such as ID=? AND ID>? were slow.
@changelog_1291_h2
@changelog_1294_h2
#Version 1.0.78 (2008-08-28)
@changelog_1292_li
@changelog_1295_li
#The documentation no longer uses a frameset (except the Javadocs).
@changelog_1293_li
@changelog_1296_li
#When using DB_CLOSE_DELAY, sometimes a NullPointerException is thrown when the database is opened almost at the same time as it is closed automatically. Thanks a lot to Dmitry Pekar for finding this!
@changelog_1294_li
@changelog_1297_li
#Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1295_li
@changelog_1298_li
#The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1296_li
@changelog_1299_li
#The H2 Console replaced an empty user name with a single space.
@changelog_1297_li
@changelog_1300_li
#The build target 'build jarSmall' now includes the embedded database.
@changelog_1298_li
@changelog_1301_li
#JdbcDataSource now keeps the password in a char array where possible.
@changelog_1299_li
@changelog_1302_li
#ResultSet.absolute did not always work with large result sets.
@changelog_1300_li
@changelog_1303_li
#Column aliases can now be used in GROUP BY and HAVING.
@changelog_1301_li
@changelog_1304_li
#Jason Brittain has contributed MySQL date functions. Thanks a lot! They are not in the h2.jar file currently, but in src/tools/org/h2/mode/FunctionsMySQL.java. To install, add this class to the classpath and call FunctionsMySQL.register(conn) in the Java code.
@changelog_1302_h2
@changelog_1305_h2
#Version 1.0.77 (2008-08-16)
@changelog_1303_li
@changelog_1306_li
#JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1304_li
@changelog_1307_li
#When using remote in-memory databases, large LOB objects did not work.
@changelog_1305_li
@changelog_1308_li
#Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1306_li
@changelog_1309_li
#Opening a large database was slow if there was a problem opening the previous time.
@changelog_1307_li
@changelog_1310_li
#NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1308_li
@changelog_1311_li
#CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1309_li
@changelog_1312_li
#Support a comma before closing a list, as in: create table test(id int,)
@changelog_1310_li
@changelog_1313_li
#MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1311_li
@changelog_1314_li
#DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1312_li
@changelog_1315_li
#Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1313_li
@changelog_1316_li
#ResultSet.setFetchSize is now supported.
@changelog_1314_li
@changelog_1317_li
#It has been reported that when using Install4j on some Linux systems and enabling the 'pack200' option, the h2.jar becomes corrupted by the install process, causing application failure. A workaround is to add an empty file h2.jar.nopack next to the h2.jar file. The reason for this problem is not known.
@changelog_1315_h2
@changelog_1318_h2
#Version 1.0.76 (2008-07-27)
@changelog_1316_li
@changelog_1319_li
#The comment of a domain (user defined data type) is now used as the default column comment when creating a column with this domain.
@changelog_1317_li
@changelog_1320_li
#Invalid database names are now detected and a better error message is thrown.
@changelog_1318_li
@changelog_1321_li
#ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1319_li
@changelog_1322_li
#Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1320_li
@changelog_1323_li
#There is a problem with Hibernate when using Boolean columns. A patch for Hibernate has been submitted at http://opensource.atlassian.com/projects/hibernate/browse/HHH-3401
@changelog_1321_li
@changelog_1324_li
#ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1322_li
@changelog_1325_li
#H2 Console: the progress display when opening a database has been improved.
@changelog_1323_li
@changelog_1326_li
#The error message when the server doesn't start has been improved.
@changelog_1324_li
@changelog_1327_li
#Key values can now be changed in updatable result sets.
@changelog_1325_li
@changelog_1328_li
#Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1326_li
@changelog_1329_li
#Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1327_li
@changelog_1330_li
#The database file was growing after deleting many rows, and after large update operations.
@changelog_1328_h2
@changelog_1331_h2
#Version 1.0.75 (2008-07-14)
@changelog_1329_li
@changelog_1332_li
#Multi version concurrency (MVCC): when a row was updated or deleted, but this change was rolled back, the row was not visible by other sessions if no index was used to access it. Fixed.
@changelog_1330_li
@changelog_1333_li
#Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1331_li
@changelog_1334_li
#The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1332_li
@changelog_1335_li
#Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1333_li
@changelog_1336_li
#Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1334_li
@changelog_1337_li
#When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1335_li
@changelog_1338_li
#Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1336_li
@changelog_1339_li
#Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1337_li
@changelog_1340_li
#The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1338_li
@changelog_1341_li
#The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1339_li
@changelog_1342_li
#The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1340_li
@changelog_1343_li
#Stopping a WebServer didn't always work. Fixed.
@download_1000_h1
...
...
@@ -4489,63 +4498,66 @@ Unicodeをサポート
@history_1024_p
#Many thanks for those who helped by finding and reporting bugs, gave valuable feedback, spread the word and have translated this project. Also many thanks to the donors who contributed via PayPal:
@history_1025_li
#Fyodor Kupolov, Denmark
@history_1026_a
@history_1025_a
#SkyCash, Poland
@history_1027_li
@history_1026_li
#Donald Bleyl, USA
@history_1028_li
@history_1027_li
#lumber-mill.co.jp, Japan
@history_1029_li
@history_1028_li
#Frank Berger, Germany
@history_1030_li
@history_1029_li
#Ashwin Jayaprakash, USA
@history_1031_li
@history_1030_li
#Florent Ramiere, France
@history_1032_li
@history_1031_li
#Jun Iyama, Japan
@history_1033_li
@history_1032_li
#Antonio Casqueiro, Portugal
@history_1034_li
@history_1033_li
#Oliver Computing LLC, USA
@history_1035_li
@history_1034_li
#Harpal Grover Consulting Inc., USA
@history_1036_li
@history_1035_li
#Elisabetta Berlini, Italy
@history_1037_li
@history_1036_li
#William Gilbert, USA
@history_1038_li
@history_1037_li
#Antonio Dieguez, Chile
@history_1039_a
@history_1038_a
#Ontology Works, USA
@history_1040_li
@history_1039_li
#Pete Haidinyak, USA
@history_1041_li
@history_1040_li
#William Osmond, USA
@history_1042_li
@history_1041_li
#Joachim Ansorg, Germany
@history_1043_li
@history_1042_li
#Oliver Soerensen, Germany
@history_1043_li
#Christos Vasilakis, Greece
@history_1044_li
#Fyodor Kupolov, Denmark
@installation_1000_h1
インストール
...
...
@@ -6221,7 +6233,7 @@ See what this database can do and how to use these features.
#Database Profiling
@performance_1005_a
#Performance Tuning
#Database Performance Tuning
@performance_1006_a
#Fast Database Import
...
...
@@ -7460,36 +7472,48 @@ MySQL
#The SQL statement ANALYZE can be used to automatically estimate the selectivity of the columns in the tables. This command should be run from time to time to improve the query plans generated by the optimizer.
@performance_1418_h3
#Optimization Examples
#In-Memory (Hash) Indexes
@performance_1419_p
#Using in-memory indexes, specially in-memory hash indexes, can speed up queries and data manipulation.
@performance_1420_p
#In-memory indexes are automatically used for in-memory databases, but can also be created for persistent databases using <code>CREATE MEMORY TABLE</code> . In many cases, the rows itself will also be kept in-memory. Please note this may cause memory problems for large tables.
@performance_1421_p
#In-memory hash indexes are backed by a hash table and are usually faster than regular indexes. However, hash indexes only supports direct lookup (WHERE ID = ?) but not range scan (WHERE ID < ?). To use hash indexes, use HASH as in: <code>CREATE UNIQUE HASH INDEX</code> and <code>CREATE TABLE ...(ID INT PRIMARY KEY HASH,...)</code> .
@performance_1422_h3
#Optimization Examples
@performance_1423_p
#See <code>src/test/org/h2/samples/optimizations.sql</code> for a few examples of queries that benefit from special optimizations built into the database.
@performance_1420_h3
@performance_1424_h3
#Cache Size and Type
@performance_1421_p
@performance_1425_p
#By default the cache size of H2 is quite small. Consider using a larger cache size, or enable the second level soft reference cache. See also <a href="features.html#cache_settings">Cache Settings</a> .
@performance_1422_h2
@performance_1426_h2
#Fast Database Import
@performance_1423_p
@performance_1427_p
#To speed up large imports, consider using the following options temporarily:
@performance_1424_li
@performance_1428_li
#SET CACHE_SIZE (a large cache is faster)
@performance_1425_li
@performance_1429_li
#SET LOCK_MODE 0 (disable locking)
@performance_1426_li
@performance_1430_li
#SET LOG 0 (disable the transaction log)
@performance_1427_li
@performance_1431_li
#SET UNDO_LOG 0 (disable the session undo log)
@performance_1428_p
@performance_1432_p
#These options can be set in the database URL: <code>jdbc:h2:~/test;CACHE_SIZE=65536;LOCK_MODE=0;LOG=0;UNDO_LOG=0</code> . Most of those options are not recommended for regular use, that means you need to reset them after use.
@quickstart_1000_h1
...
...
@@ -8531,297 +8555,300 @@ SQLコマンドがコマンドエリアに表示されます。
#Test Eclipse DTP.
@roadmap_1313_li
#H2 Console: autocomplete: keep the previous setting
#Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1314_li
#MySQL, MS SQL Server compatibility: support case sensitive (mixed case) identifiers without quotes.
#H2 Console: autocomplete: keep the previous setting
@roadmap_1315_li
#executeBatch: option to stop at the first failed statement.
#MySQL, MS SQL Server compatibility: support case sensitive (mixed case) identifiers without quotes.
@roadmap_1316_li
#Implement OLAP features as described here: http://www.devx.com/getHelpOn/10MinuteSolution/16573/0/page/5
#executeBatch: option to stop at the first failed statement.
@roadmap_1317_li
#Support Oracle ROWID (unique identifier for each row).
#Implement OLAP features as described here: http://www.devx.com/getHelpOn/10MinuteSolution/16573/0/page/5
@roadmap_1318_li
#Server mode: improve performance for batch updates.
#Support Oracle ROWID (unique identifier for each row).
@roadmap_1319_li
#Applets: support read-only databases in a zip file (accessed as a resource).
#Server mode: improve performance for batch updates.
@roadmap_1320_li
#Long running queries / errors / trace system table.
#Applets: support read-only databases in a zip file (accessed as a resource).
@roadmap_1321_li
#H2 Console should support JaQu directly.
#Long running queries / errors / trace system table.
@roadmap_1322_li
#H2 Console: support single file upload and directory download (optional).
#H2 Console should support JaQu directly.
@roadmap_1323_li
#Document FTL_SEARCH, FTL_SEARCH_DATA.
#H2 Console: support single file upload and directory download (optional).
@roadmap_1324_li
#Sequences: CURRVAL should be session specific. Compatibility with PostgreSQL.
#Document FTL_SEARCH, FTL_SEARCH_DATA.
@roadmap_1325_li
#Support DatabaseMetaData.insertsAreDetected: updatable result sets should detect inserts.
#Sequences: CURRVAL should be session specific. Compatibility with PostgreSQL.
@roadmap_1326_li
#Auto-server: add option to define the IP address range or list.
#Support DatabaseMetaData.insertsAreDetected: updatable result sets should detect inserts.
@roadmap_1327_li
#Index creation only using deterministic functions.
#Auto-server: add option to define the IP address range or list.
@roadmap_1328_li
#Use http://recaptcha.net somehow to secure the Google Group.
#Index creation only using deterministic functions.
@roadmap_1329_li
#Support DELETE with TOP or LIMIT. See also: http://dev.mysql.com/doc/refman/5.1/de/delete.html
#Use http://recaptcha.net somehow to secure the Google Group.
@roadmap_1330_li
#Change the default for NULL || 'x' to return NULL
#Support DELETE with TOP or LIMIT. See also: http://dev.mysql.com/doc/refman/5.1/de/delete.html
@roadmap_1331_li
#ANALYZE: use a bloom filter for each indexed column to estimate count of distinct values.
#Change the default for NULL || 'x' to return NULL
@roadmap_1332_li
#ANALYZE: for unique indexes that allow null, count the number of null.
#ANALYZE: use a bloom filter for each indexed column to estimate count of distinct values.
@roadmap_1333_li
#AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
#ANALYZE: for unique indexes that allow null, count the number of null.
@roadmap_1334_li
#Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
#AUTO_SERVER: support changing IP addresses (disable a network while the database is open).
@roadmap_1335_li
#Support TRUNCATE .. CASCADE like PostgreSQL.
#Avoid using java.util.Calendar internally because it's slow, complicated, and seems to be buggy.
@roadmap_1336_li
#Support opening a database that is in the classpath, maybe using a new file system.
#Support TRUNCATE .. CASCADE like PostgreSQL.
@roadmap_1337_li
#Fulltext search: lazy result generation using SimpleRowSource.
#Support opening a database that is in the classpath, maybe using a new file system.
@roadmap_1338_li
#Support transformation to join for user defined functions, as for IN(SELECT...).
#Fulltext search: lazy result generation using SimpleRowSource.
@roadmap_1339_li
#Fulltext search: support alternative syntax: WHERE FTL_CONTAINS(name, 'hello').
#Support transformation to join for user defined functions, as for IN(SELECT...).
@roadmap_1340_li
#MySQL compatibility: support REPLACE, see http://dev.mysql.com/doc/refman/5.1/de/replace.html
#Fulltext search: support alternative syntax: WHERE FTL_CONTAINS(name, 'hello').
@roadmap_1341_li
#MySQL compatibility: support INSERT INTO table SET column1 = value1, column2 = value2
#MySQL compatibility: support REPLACE, see http://dev.mysql.com/doc/refman/5.1/de/replace.html
@roadmap_1342_li
#Docs: add a one line description for each functions and SQL statements at the top (in the link section).
#MySQL compatibility: support INSERT INTO table SET column1 = value1, column2 = value2
@roadmap_1343_li
#Javadoc search: weight for titles should be higher ('random' should list Functions as the best match).
#Docs: add a one line description for each functions and SQL statements at the top (in the link section).
@roadmap_1344_li
#Replace information_schema tables with regular tables that are automatically re-built when needed. Use indexes.
#Javadoc search: weight for titles should be higher ('random' should list Functions as the best match).
@roadmap_1345_li
#Support a special trigger on all tables.
#Replace information_schema tables with regular tables that are automatically re-built when needed. Use indexes.
@roadmap_1346_li
#Delete temporary files or objects using finalize.
#Support a special trigger on all tables.
@roadmap_1347_li
#Oracle compatibility: support calling 0-parameters functions without parenthesis. Make constants obsolete.
#Delete temporary files or objects using finalize.
@roadmap_1348_li
#MySQL, HSQLDB compatibility: support where 'a'=1 (not supported by Derby, PostgreSQL)
#Oracle compatibility: support calling 0-parameters functions without parenthesis. Make constants obsolete.
@roadmap_1349_li
#Allow calling function with no parameters without parenthesis. See http://code.google.com/p/h2database/issues/detail?id=50
#MySQL, HSQLDB compatibility: support where 'a'=1 (not supported by Derby, PostgreSQL)
@roadmap_1350_li
#CSV: currently # is a line comment and can start at any field. Make it optional.
#Allow calling function with no parameters without parenthesis. See http://code.google.com/p/h2database/issues/detail?id=50
@roadmap_1351_li
#Add database creation date and time to the database.
#CSV: currently # is a line comment and can start at any field. Make it optional.
@roadmap_1352_li
#Support ASSERTIONS.
#Add database creation date and time to the database.
