</li><li>Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
</li><li>iReport to support H2
</li><li>Implement missing JDBC API (CallableStatement,...)
</li><li>Compression of the cache
...
...
@@ -100,7 +101,6 @@ Of course, patches are always welcome, but are not always applied as is. Patches
</li><li>Copy database: Tool with config GUI and batch mode, extensible (example: compare)
</li><li>Document, implement tool for long running transactions using user-defined compensation statements
</li><li>Support SET TABLE DUAL READONLY
</li><li>Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
</li><li>GCJ: what is the state now?
</li><li>Reduce disk space usage
</li><li>Events for: Database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
...
...
@@ -401,6 +401,7 @@ Of course, patches are always welcome, but are not always applied as is. Patches
</li><li>CSV: currently # is a line comment and can start at any field. Make it optional.
</li><li>Add database creation date and time to the database.
</li><li>Support ASSERTIONS.
</li><li>MySQL compatibility: support comparing 1='a'
@@ -638,10 +638,10 @@ To test the durability / non-durability of this and other databases, you can use
Using the Recover Tool
@advanced_1213_p
The recover tool can be used to extract the contents of a data file, even if the database is corrupted. At this time, it does not extract the content of the log file or large objects (CLOB or BLOB). To run the tool, type on the command line:
The recover tool can be used to extract the contents of a data file, even if the database is corrupted. It also extracts the content of the log file or large objects (CLOB or BLOB). To run the tool, type on the command line:
@advanced_1214_p
For each database in the current directory, a text file will be created. This file contains raw insert statement (for the data) and data definition (DDL) statement to recreate the schema of the database. This file cannot be executed directly, as the raw insert statements don't have the correct table names, so the file needs to be pre-processed manually before executing.
For each database in the current directory, a text file will be created. This file contains raw insert statement (for the data) and data definition (DDL) statement to recreate the schema of the database. This file can be executed using the RunScript tool or a <code>RUNSCRIPT FROM</code> SQL statement. The script include at least one CREATE USER statement. If you run the script against a database that was created with the same user, or if there are conflicting users, running the script will fail. Consider running the script against a database that was created with a user name that is not in the script.
@advanced_1215_h2
File Locking Protocols
...
...
@@ -650,7 +650,7 @@ File Locking Protocols
Whenever a database is opened, a lock file is created to signal other processes that the database is in use. If database is closed, or if the process that opened the database terminates, this lock file is deleted.
@advanced_1217_p
In special cases (if the process did not terminate normally, for example because there was a blackout), the lock file is not deleted by the process that created it. That means the existence of the lock file is not a safe protocol for file locking. However, this software uses a challenge-response protocol to protect the database files. There are two methods (algorithms) implemented to provide both security (that is, the same database files cannot be opened by two processes at the same time) and simplicity (that is, the lock file does not need to be deleted manually by the user). The two methods are 'file method' and 'socket methods'.
In special cases (if the process did not terminate normally, for example because there was a power failure), the lock file is not deleted by the process that created it. That means the existence of the lock file is not a safe protocol for file locking. However, this software uses a challenge-response protocol to protect the database files. There are two methods (algorithms) implemented to provide both security (that is, the same database files cannot be opened by two processes at the same time) and simplicity (that is, the lock file does not need to be deleted manually by the user). The two methods are 'file method' and 'socket methods'.
@advanced_1218_h3
File Locking Method 'File'
...
...
@@ -674,7 +674,7 @@ This algorithm is tested with over 100 concurrent threads. In some cases, when t
File Locking Method 'Socket'
@advanced_1225_p
There is a second locking mechanism implemented, but disabled by default. The algorithm is:
There is a second locking mechanism implemented, but disabled by default. To use it, append <code>;FILE_LOCK=SOCKET</code> to the database URL. The algorithm is:
@advanced_1226_li
If the lock file does not exist, it is created. Then a server socket is opened on a defined port, and kept open. The port and IP address of the process that opened the database is written into the lock file.
...
...
@@ -683,7 +683,7 @@ If the lock file does not exist, it is created. Then a server socket is opened o
If the lock file exists, and the lock method is 'file', then the software switches to the 'file' method.
@advanced_1228_li
If the lock file exists, and the lock method is 'socket', then the process checks if the port is in use. If the original process is still running, the port is in use and this process throws an exception (database is in use). If the original process died (for example due to a blackout, or abnormal termination of the virtual machine), then the port was released. The new process deletes the lock file and starts again.
If the lock file exists, and the lock method is 'socket', then the process checks if the port is in use. If the original process is still running, the port is in use and this process throws an exception (database is in use). If the original process died (for example due to a power failure, or abnormal termination of the virtual machine), then the port was released. The new process deletes the lock file and starts again.
@advanced_1229_p
This method does not require a watchdog thread actively polling (reading) the same file every second. The problem with this method is, if the file is stored on a network share, two processes (running on different computers) could still open the same database files, if they do not have a direct TCP/IP connection.
...
...
@@ -1142,1080 +1142,1095 @@ Change Log
Next Version (unreleased)
@changelog_1002_li
Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
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_1003_li
Improved exception message when connecting to a just started server fails.
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_1004_li
Connection.isValid is a bit faster.
The WebServlet did not close the database when un-deploying the web application.
@changelog_1005_li
H2 Console: The autocomplete feature has been improved a bit. It can now better parse conditions.
The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1006_li
If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1007_li
Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1008_li
Improved exception message when connecting to a just started server fails.
@changelog_1009_li
Connection.isValid is a bit faster.
@changelog_1010_li
H2 Console: The autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1011_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_1007_h2
@changelog_1012_h2
Version 1.1.107 (2009-01-24)
@changelog_1008_li
@changelog_1013_li
Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1009_li
@changelog_1014_li
The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1010_li
@changelog_1015_li
When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1011_li
@changelog_1016_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_1012_li
@changelog_1017_li
Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1013_h2
@changelog_1018_h2
Version 1.1.106 (2009-01-04)
@changelog_1014_li
@changelog_1019_li
Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1015_li
@changelog_1020_li
CREATE DOMAIN: Built-in data types can now only be changed if no tables exist.
@changelog_1016_li
@changelog_1021_li
Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1017_li
@changelog_1022_li
DatabaseMetaData.getPrimaryKeys: The column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1018_li
@changelog_1023_li
Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1019_li
@changelog_1024_li
Views with IN(..) that used a view itself did not work.
@changelog_1020_li
@changelog_1025_li
Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1021_li
@changelog_1026_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_1022_li
@changelog_1027_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_1023_li
@changelog_1028_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_1024_h2
@changelog_1029_h2
Version 1.1.105 (2008-12-19)
@changelog_1025_li
@changelog_1030_li
The setting STORAGE=TEXT is no longer supported.
@changelog_1026_li
@changelog_1031_li
Deleting a database using the tool DeleteDbFiles deleted LOB files of other databases in the same directory.
@changelog_1027_li
@changelog_1032_li
When used in a subquery, LIKE and IN(..) did not work correctly sometimes.
@changelog_1028_li
@changelog_1033_li
The fulltext search documentation has been improved.
@changelog_1029_li
@changelog_1034_li
ARRAY_GET returned the wrong data type (ARRAY). Now it returns VARCHAR.
@changelog_1030_li
@changelog_1035_li
Natural join: the joined columns are not repeated any more when using SELECT *.
@changelog_1031_li
@changelog_1036_li
User defined aggregate functions: the method getType expected internal data types instead of SQL types.
@changelog_1032_li
@changelog_1037_li
User defined aggregate functions did not work if there was no group by expression.
@changelog_1033_li
@changelog_1038_li
MySQL compatibility: support for := assignment as in @sum:=@sum+x
@changelog_1034_li
@changelog_1039_li
INSERT INTO TEST(SELECT * FROM TEST) is now supported.
@changelog_1035_li
@changelog_1040_li
Each session threw an invisible exception when garbage collected.
@changelog_1036_li
@changelog_1041_li
Foreign key constraints that refer to a quoted column did not work.
@changelog_1037_li
@changelog_1042_li
New meta data column INFORMATION_SCHEMA.TABLES.LAST_MODIFICATION to get the table modification counter.
@changelog_1038_li
@changelog_1043_li
Shell: line comments didn't work correctly.
@changelog_1039_li
@changelog_1044_li
H2 Console: Columns are now listed for up to 500 tables instead of 100.
@changelog_1040_li
@changelog_1045_li
H2 Console: Cmd+Enter executes the current statement, Alt+Space for autocomplete.
@changelog_1041_li
@changelog_1046_li
JaQu: the maximum length of a column can now be defined using maxLength. For an example, see Product.java (maxLength(category, 255)).
@changelog_1042_li
@changelog_1047_li
R&\#305;dvan A&\#287;ar has completed the Turkish translation of the H2 Console. Thanks a lot!
@changelog_1043_h2
@changelog_1048_h2
Version 1.1.104 (2008-11-28)
@changelog_1044_li
@changelog_1049_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_1045_li
@changelog_1050_li
JaQu: tables are now auto-created when running a query.
@changelog_1046_li
@changelog_1051_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_1047_li
@changelog_1052_li
The function SUM could overflow when using large values. It returns now a data type that is safe.
@changelog_1048_li
@changelog_1053_li
The function AVG could overflow when using large values. Fixed.
@changelog_1049_li
@changelog_1054_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_1050_li
@changelog_1055_li
Build: JAVA_HOME is now automatically detected on Mac OS X.
@changelog_1051_li
@changelog_1056_li
Testing for local connections was very slow on some systems.
@changelog_1052_li
@changelog_1057_li
The cache memory usage calculation is more conservative.
@changelog_1053_li
@changelog_1058_li
Allocating space got slower and slower the larger the database.
@changelog_1054_li
@changelog_1059_li
ALTER TABLE ALTER COLUMN could throw the wrong exception in the last version (Table not found).
@changelog_1055_li
@changelog_1060_li
Updatable result sets: the key columns can now be updated.
@changelog_1056_li
@changelog_1061_li
The H2DatabaseProvider for ActiveObjects is now included in the tools section.
@changelog_1057_li
@changelog_1062_li
The H2Platform for Oracle Toplink Essential has been improved a bit.
@changelog_1058_li
@changelog_1063_li
The Windows service to start H2 didn't work in version 1.1.
@changelog_1059_li
@changelog_1064_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_1060_li
@changelog_1065_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_1061_li
@changelog_1066_li
Compatibility for MS SQL Server DATEDIFF(YYYY, .., ..)
@changelog_1062_li
@changelog_1067_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_1063_li
@changelog_1068_li
The interface CloseListener has a new method 'remove' that is called when the trigger is dropped.
@changelog_1064_li
@changelog_1069_li
Fulltext search: there was a memory leak when creating and dropping fulltext indexes in a loop.
@changelog_1065_h2
@changelog_1070_h2
Version 1.1.103 (2008-11-07)
@changelog_1066_li
@changelog_1071_li
Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1067_li
@changelog_1072_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_1068_li
@changelog_1073_li
ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1069_li
@changelog_1074_li
Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1070_li
@changelog_1075_li
New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1071_li
@changelog_1076_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_1072_li
@changelog_1077_li
The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1073_li
@changelog_1078_li
Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1074_li
@changelog_1079_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_1075_li
@changelog_1080_li
New system property h2.browser to set the browser to use.
@changelog_1076_li
@changelog_1081_li
To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1077_h2
@changelog_1082_h2
Version 1.1.102 (2008-10-24)
@changelog_1078_li
@changelog_1083_li
The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1079_li
@changelog_1084_li
There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1080_li
@changelog_1085_li
SET LOG 2 was not effective if executed after opening the database.
@changelog_1081_li
@changelog_1086_li
Translating the H2 Console is now simpler.
@changelog_1082_li
@changelog_1087_li
Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1083_li
@changelog_1088_li
In-memory databases don't write LOBs to files any longer.
@changelog_1084_li
@changelog_1089_li
Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1085_li
@changelog_1090_li
ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1086_li
@changelog_1091_li
Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1087_h2
@changelog_1092_h2
Version 1.1.101 (2008-10-17)
@changelog_1088_li
@changelog_1093_li
Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1089_li
@changelog_1094_li
Queries with more than 10 tables are now faster.
@changelog_1090_li
@changelog_1095_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_1091_li
@changelog_1096_li
IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1092_li
@changelog_1097_li
The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1093_li
@changelog_1098_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_1094_li
@changelog_1099_li
Opening large database is now faster.
@changelog_1095_li
@changelog_1100_li
New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1096_li
@changelog_1101_li
The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1097_li
@changelog_1102_li
Unset parameters were not detected when the query was re-compiled.
@changelog_1098_li
@changelog_1103_li
New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1099_li
@changelog_1104_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_1100_li
@changelog_1105_li
An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1101_li
@changelog_1106_li
Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1102_li
@changelog_1107_li
Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1103_li
@changelog_1108_li
The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1104_li
@changelog_1109_li
Fulltext search: new method FT_DROP_INDEX.
@changelog_1105_li
@changelog_1110_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_1106_li
@changelog_1111_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_1107_li
@changelog_1112_li
The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1108_li
@changelog_1113_li
For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1109_li
@changelog_1114_li
In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1110_li
@changelog_1115_li
After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1111_li
@changelog_1116_li
Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1112_li
@changelog_1117_li
RUNSCRIPT no longer uses a temporary file.
@changelog_1113_li
@changelog_1118_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_1114_li
@changelog_1119_li
After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1115_li
@changelog_1120_li
The build didn't work if the directory temp didn't exist before.
@changelog_1116_li
@changelog_1121_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_1117_li
@changelog_1122_li
WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1118_li
@changelog_1123_li
Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1119_h2
@changelog_1124_h2
Version 1.1.100 (2008-10-04)
@changelog_1120_li
@changelog_1125_li
In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1121_li
@changelog_1126_li
The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1122_li
@changelog_1127_li
The H2 Console tool now supports command line options to start things separately.
@changelog_1123_li
@changelog_1128_li
Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1124_li
@changelog_1129_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_1125_li
@changelog_1130_li
The h2console.war can now be built using the Java build.
@changelog_1126_li
@changelog_1131_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_1127_li
@changelog_1132_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_1128_li
@changelog_1133_li
CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1129_li
@changelog_1134_li
The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1130_li
@changelog_1135_li
Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1131_h2
@changelog_1136_h2
Version 1.0.79 (2008-09-26)
@changelog_1132_li
@changelog_1137_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_1133_li
@changelog_1138_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_1134_li
@changelog_1139_li
The server tool now displays the correct IP address if networked.
@changelog_1135_li
@changelog_1140_li
Can now start a TCP server with port 0 (automatically select a port).
@changelog_1136_li
@changelog_1141_li
Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1137_li
@changelog_1142_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_1138_li
@changelog_1143_li
LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1139_li
@changelog_1144_li
Faster hash code calculation for large binary arrays.
@changelog_1140_li
@changelog_1145_li
Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1141_li
@changelog_1146_li
The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1142_li
@changelog_1147_li
The H2 Console now abbreviates large texts in results.
@changelog_1143_li
@changelog_1148_li
Multiple UNION queries could not be used in derived tables.
@changelog_1144_li
@changelog_1149_li
Linked tables can now be read-only.
@changelog_1145_li
@changelog_1150_li
Temporary linked tables are now supported.
@changelog_1146_li
@changelog_1151_li
It was possible to create tables in read-only databases.
@changelog_1147_li
@changelog_1152_li
SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1148_li
@changelog_1153_li
SET SCHEMA did not work for views.
@changelog_1149_li
@changelog_1154_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_1150_li
@changelog_1155_li
The maximum log file size setting was ignored for large databases.
@changelog_1151_li
@changelog_1156_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_1152_li
@changelog_1157_li
The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1153_li
@changelog_1158_li
The system property h2.optimizeInJoin did not work correctly.
@changelog_1154_li
@changelog_1159_li
Conditions such as ID=? AND ID>? were slow.
@changelog_1155_h2
@changelog_1160_h2
Version 1.0.78 (2008-08-28)
@changelog_1156_li
@changelog_1161_li
The documentation no longer uses a frameset (except the Javadocs).
@changelog_1157_li
@changelog_1162_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_1158_li
@changelog_1163_li
Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1159_li
@changelog_1164_li
The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1160_li
@changelog_1165_li
The H2 Console replaced an empty user name with a single space.
@changelog_1161_li
@changelog_1166_li
The build target 'build jarSmall' now includes the embedded database.
@changelog_1162_li
@changelog_1167_li
JdbcDataSource now keeps the password in a char array where possible.
@changelog_1163_li
@changelog_1168_li
ResultSet.absolute did not always work with large result sets.
@changelog_1164_li
@changelog_1169_li
Column aliases can now be used in GROUP BY and HAVING.
@changelog_1165_li
@changelog_1170_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_1166_h2
@changelog_1171_h2
Version 1.0.77 (2008-08-16)
@changelog_1167_li
@changelog_1172_li
JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1168_li
@changelog_1173_li
When using remote in-memory databases, large LOB objects did not work.
@changelog_1169_li
@changelog_1174_li
Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1170_li
@changelog_1175_li
Opening a large database was slow if there was a problem opening the previous time.
@changelog_1171_li
@changelog_1176_li
NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1172_li
@changelog_1177_li
CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1173_li
@changelog_1178_li
Support a comma before closing a list, as in: create table test(id int,)
@changelog_1174_li
@changelog_1179_li
MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1175_li
@changelog_1180_li
DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1176_li
@changelog_1181_li
Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1177_li
@changelog_1182_li
ResultSet.setFetchSize is now supported.
@changelog_1178_li
@changelog_1183_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_1179_h2
@changelog_1184_h2
Version 1.0.76 (2008-07-27)
@changelog_1180_li
@changelog_1185_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_1181_li
@changelog_1186_li
Invalid database names are now detected and a better error message is thrown.
@changelog_1182_li
@changelog_1187_li
ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1183_li
@changelog_1188_li
Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1184_li
@changelog_1189_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_1185_li
@changelog_1190_li
ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1186_li
@changelog_1191_li
H2 Console: The progress display when opening a database has been improved.
@changelog_1187_li
@changelog_1192_li
The error message when the server doesn't start has been improved.
@changelog_1188_li
@changelog_1193_li
Key values can now be changed in updatable result sets.
@changelog_1189_li
@changelog_1194_li
Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1190_li
@changelog_1195_li
Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1191_li
@changelog_1196_li
The database file was growing after deleting many rows, and after large update operations.
@changelog_1192_h2
@changelog_1197_h2
Version 1.0.75 (2008-07-14)
@changelog_1193_li
@changelog_1198_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_1194_li
@changelog_1199_li
Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1195_li
@changelog_1200_li
The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1196_li
@changelog_1201_li
Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1197_li
@changelog_1202_li
Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1198_li
@changelog_1203_li
When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1199_li
@changelog_1204_li
Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1200_li
@changelog_1205_li
Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1201_li
@changelog_1206_li
The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1202_li
@changelog_1207_li
The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1203_li
@changelog_1208_li
The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1204_li
@changelog_1209_li
Stopping a WebServer didn't always work. Fixed.
@changelog_1205_h2
@changelog_1210_h2
Version 1.0.74 (2008-06-21)
@changelog_1206_li
@changelog_1211_li
Work on row level locking has been started (but there is nothing usable yet).
@changelog_1207_li
@changelog_1212_li
JaQu (Java Query), a tool similar to LINQ (Language Integrated Query; from Microsoft) is now included under src/tools/org/h2/jaqu. A small sample application is included under src/test/org/h2/test/jaqu.
@changelog_1208_li
@changelog_1213_li
The source code is now switched to Java 1.6 by default. To switch back to Java 1.4, run 'build compile'. The h2.jar file is still Java 1.4.
@changelog_1209_li
@changelog_1214_li
The ChangePassword tool is now called ChangeFileEncryption.
@changelog_1210_li
@changelog_1215_li
It is no longer allowed to create columns with the data type NULL. Also, it is no longer allowed to convert a column to the data type NULL. This was possible before but caused data loss.
@changelog_1211_li
@changelog_1216_li
When using computed columns or default values with a different data type than the column data type, a class cast exception could occur. Fixed.
@changelog_1212_li
@changelog_1217_li
Opening databases larger than 1 GB was sometimes very slow if a lot of data was deleted previously. Fixed.
@changelog_1213_li
@changelog_1218_li
RUNSCRIPT could throw a NullPointerException if the script name was an expression.
@changelog_1214_li
@changelog_1219_li
Improved compatibility. New compatibility modes for Oracle and Derby. New compatibility flag uniqueIndexNullDistinct to only allow one row with 'NULL' in a unique index. This flag is enabled for Derby, Oracle, MSSQLServer, and HSQLDB.
@changelog_1215_li
@changelog_1220_li
Linked tables: To view the statements that are executed against the target table, set the trace level to 3.
@changelog_1216_li
@changelog_1221_li
RunScript tool: new options to show and check the results of queries.
@changelog_1217_li
@changelog_1222_li
Deadlocks are now detected. One transaction is rolled back automatically.
@changelog_1218_li
@changelog_1223_li
The Lucene fulltext index was always re-created when opening a database with fulltext index enabled.
@changelog_1219_li
@changelog_1224_li
Support for overloaded Java methods. A user defined function can now be bound to multiple Java methods, if the Java methods have the same name but a different number of parameters. Thanks to Gary Tong for providing a patch!
@changelog_1220_h2
@changelog_1225_h2
Version 1.0.73 (2008-05-31)
@changelog_1221_li
@changelog_1226_li
ParameterMetaData now returns the right data type for most conditions, as in WHERE ID=?.
@changelog_1222_li
@changelog_1227_li
The table SYSTEM_RANGE now supports expressions and parameters.
@changelog_1223_li
@changelog_1228_li
New column INFORMATION_SCHEMA.CONSTRAINTS.UNIQUE_INDEX_NAME that contains the name of the unique index used to enforce this constraint, if there is such an index.
@changelog_1224_li
@changelog_1229_li
SET QUERY_TIMEOUT and Statement.setQueryTimeout no longer commits a transaction. The same applies to SET @VARIABLE, SET LOCK_TIMEOUT, SET TRACE_LEVEL_*, SET THROTTLE, and SET PATH.
@changelog_1225_li
@changelog_1230_li
The SCRIPT command does now emit IF NOT EXISTS for CREATE ROLE.
@changelog_1226_li
@changelog_1231_li
MySQL compatibility: auto_increment column are no longer automatically converted to primary key columns.
@changelog_1227_li
@changelog_1232_li
PostgreSQL compatibility: support for BOOL_OR and BOOL_AND aggregate functions.
@changelog_1228_li
@changelog_1233_li
Negative scale values for DECIMAL or NUMBER columns are now supported in regular tables and in linked tables.
@changelog_1229_li
@changelog_1234_li
A role or right can now be granted or revoked multiple times without getting an exception.
@changelog_1230_li
@changelog_1235_li
Infinite numbers in SQL scripts are listed as POWER(0, -1)), negative infinite as (-POWER(0, -1)), and NaN (not a number) as SQRT(-1).
@changelog_1231_li
@changelog_1236_li
The special double and float values 'NaN' (not a number) did not work correctly when sorting or comparing.
@changelog_1232_li
@changelog_1237_li
The fulltext search did not support CLOB data types.
@changelog_1233_li
@changelog_1238_li
If the drive with the database files was disconnected or unmounted while writing, sometimes a stack overflow exception was thrown instead of a IO exception.
@changelog_1234_li
@changelog_1239_li
The H2 Console could not be shut down from within the tool if the browser supports keepAlive (most browsers do).
@changelog_1235_li
@changelog_1240_li
If the password was passed as a char array, it was kept in an internal buffer longer than required. Theoretically the password could have been stolen if the main memory was swapped to disk before the garbage collection was run.
@changelog_1236_h2
@changelog_1241_h2
Version 1.0.72 (2008-05-10)
@changelog_1237_li
@changelog_1242_li
Some databases could not be opened when appending ;RECOVER=1 to the database URL.
@changelog_1238_li
@changelog_1243_li
The Japanese translation of the error messages and the H2 Console has been completed by Masahiro Ikemoto (Arizona Design Inc.)
@changelog_1239_li
@changelog_1244_li
Updates made to updatable rows are now visible within the same result set. DatabaseMetaData.ownUpdatesAreVisible now returns true.
@changelog_1240_li
@changelog_1245_li
ParameterMetaData now returns the correct data for INSERT and UPDATE statements.
@changelog_1241_li
@changelog_1246_li
H2 Shell: DESCRIBE now supports an schema name.
@changelog_1242_li
@changelog_1247_li
A subset of the PostgreSQL 'dollar quoting' feature is now supported.
@changelog_1243_li
@changelog_1248_li
SLF4J is now supported by using adding TRACE_LEVEL_FILE=4 to the database URL.
@changelog_1244_li
@changelog_1249_li
The recovery tool did not work if the table name contained spaces or if there was a comment on the table.
@changelog_1245_li
@changelog_1250_li
Triggers are no longer executed when changing the table structure (ALTER TABLE).
@changelog_1246_li
@changelog_1251_li
When setting BLOB or CLOB values larger than 65 KB using a remote connection, temporary files were kept on the client longer than required (until the connection was closed or the object is garbage collected). Now they are removed as soon as the PreparedStatement is closed, or when the value is overwritten.
@changelog_1247_li
@changelog_1252_li
Statements can now be canceled remotely (when using remote connections).
@changelog_1248_li
@changelog_1253_li
The Shell tool now uses java.io.Console to read the password when using JDK 1.6
@changelog_1249_li
@changelog_1254_li
When using read-only databases and setting LOG=2, an exception was written to the trace file when closing the database. Fixed.
@changelog_1250_h2
@changelog_1255_h2
Version 1.0.71 (2008-04-25)
@changelog_1251_li
@changelog_1256_li
H2 is now dual-licensed under the Eclipse Public License (EPL) and the old 'H2 License' (which is basically MPL).
@changelog_1252_li
@changelog_1257_li
Sometimes an exception 'File ID mismatch' or 'try to add a record twice' occurred after large records (8 KB or larger) are updated or deleted. See also http://code.google.com/p/h2database/issues/detail?id=22
@changelog_1253_li
@changelog_1258_li
H2 Console: The tools can now be translated (it didn't work in the last release).
@changelog_1254_li
@changelog_1259_li
New traditional Chinese translation. Thanks a lot to Derek Chao!
@changelog_1255_li
@changelog_1260_li
Indexes were not used when enabling the optimization for IN(SELECT...) (system property h2.optimizeInJoin).
@changelog_1256_h2
@changelog_1261_h2
Version 1.0.70 (2008-04-20)
@changelog_1257_li
@changelog_1262_li
The plan is to dual-license H2. The additional license is EPL (Eclipse Public License). The current license (MPL, Mozilla Public License) will stay. Current users are not affected because they can keep MPL. EPL is very similar to MPL, the only bigger difference is related to patents (EPL is a bit more business friendly in this regard). See also http://opensource.org/licenses/eclipse-1.0.php, http://www.eclipse.org/legal/eplfaq.php (FAQ), http://blogs.zdnet.com/Burnette/?p=131
@changelog_1258_li
@changelog_1263_li
Multi version concurrency (MVCC): when a row was updated, and the updated column was not indexed, this update was visible sometimes for other sessions even if it was not committed.
@changelog_1259_li
@changelog_1264_li
Calling SHUTDOWN on one connection and starting a query on another connection concurrently could result in a Java level deadlock.
@changelog_1260_li
@changelog_1265_li
New system property h2.enableAnonymousSSL (default: true) to enable anonymous SSL connections.
@changelog_1261_li
@changelog_1266_li
The precision if SUBSTR is now calculated if possible.
@changelog_1262_li
@changelog_1267_li
The autocomplete in the H2 Console has been improved a bit.
@changelog_1263_li
@changelog_1268_li
The tools in the H2 Console are now translatable.
@changelog_1264_li
@changelog_1269_li
The servlet and lucene jar files are now automatically downloaded when building.
@changelog_1265_li
@changelog_1270_li
The code switch tool has been replaced by a simpler tool called SwitchSource that just uses find and replace.
@changelog_1266_li
@changelog_1271_li
Started to write a Ant replacement ('JAnt') that uses pure Java build definitions. Advantages: ability to debug the build, extensible, flexible, no XML, a bit faster. Future plan: support creating custom h2 distributions (for embedded use). Maybe create a new project 'Jant' or 'Javen' if other people are interested.
@changelog_1267_li
@changelog_1272_li
The jar file is now about 10% smaller because the variable debugging info is no longer included. The source file and line number debugging info is still included. If required, the jar file size of the full version can be further reduced to about 720 KB using 'build jarSmall' or even more by removing unneeded components.
@changelog_1268_li
@changelog_1273_li
Added shell scripts run.sh and build.sh. chmod +x is required, but otherwise it should work. Feedback or improvements are welcome!
@changelog_1269_li
@changelog_1274_li
Databases in zip files: large queries are now supported. Temp files are created in the temp directory if required. The documentation how to create the zip file has been corrected.
The Japanese translation of the error messages and the H2 Console has been improved. Thanks a lot to Masahiro IKEMOTO.
@changelog_1272_li
@changelog_1277_li
Optimization for MIN() and MAX() when using MVCC.
@changelog_1273_li
@changelog_1278_li
To protect against remote brute force password attacks, the delay after each unsuccessful login now gets double as long. New system properties h2.delayWrongPasswordMin and h2.delayWrongPasswordMax.
@changelog_1274_li
@changelog_1279_li
After setting the query timeout and then resetting it, the next query would still timeout. Fixed.
@changelog_1275_li
@changelog_1280_li
Adding a IDENTITY column to a table with data threw a lock timeout.
@changelog_1276_li
@changelog_1281_li
OutOfMemoryError could occur when using EXISTS or IN(SELECT ..).
@changelog_1277_li
@changelog_1282_li
The built-in connection pool is not called JdbcConnectionPool. The API and documentation has been changed.
@changelog_1278_li
@changelog_1283_li
The ConvertTraceFile tool now generates SQL statement statistics at the end of the SQL script file (similar to the profiling data generated when using java -Xrunhprof).
@changelog_1279_li
@changelog_1284_li
Nested joins are now supported (A JOIN B JOIN C ON .. ON ..)
@changelog_1280_h2
@changelog_1285_h2
Version 1.0.69 (2008-03-29)
@changelog_1281_li
@changelog_1286_li
Most command line tools can now be called from within the H2 Console.
@changelog_1282_li
@changelog_1287_li
A new Shell tools is now included (org.h2.tools.Shell) to query a database from the command line.
@changelog_1283_li
@changelog_1288_li
The command line options in the tools have changed: instead of '-log true' now '-trace' is used. Also, '-ifExists', '-tcpSSL' and '-tcpAllowOthers' and so on have changed: now the 'true' is no longer needed. The old behavior is still supported.
@changelog_1284_li
@changelog_1289_li
New system property h2.sortNullsHigh to invert the default sorting behavior for NULL. The default didn't change.
@changelog_1285_li
@changelog_1290_li
Performance was very slow when using LOG=2 and deleting or updating all rows of a table in a loop. Fixed.
@changelog_1286_li
@changelog_1291_li
ALTER TABLE or CREATE TABLE now support parameters for the password field.
@changelog_1287_li
@changelog_1292_li
The linear hash has been removed. It was always slower than the b-tree index, and there were some bugs that would be hard to fix.
@changelog_1288_li
@changelog_1293_li
TRACE_LEVEL_ settings are no longer persistent. This was a problem when database initialization code caused a lot of trace output.
@changelog_1289_li
@changelog_1294_li
Fulltext search (native implementation): The words table is no longer an in-memory table because this caused memory problems in some cases.
@changelog_1290_li
@changelog_1295_li
It was possible to create a role with the name as an existing user (but not vice versa). This is not allowed any more.
@changelog_1291_li
@changelog_1296_li
The recovery tool didn't work correctly for tables without rows.
@changelog_1292_li
@changelog_1297_li
For years below 1, the YEAR method didn't return the correct value, and the conversion from date and timestamp to varchar was incorrect.
@changelog_1293_li
@changelog_1298_li
CSVWRITE caused a NullPointerException when not specifying a nullString.
@changelog_1294_li
@changelog_1299_li
When a log file switch occurred just after a truncate table or drop table statement, the database could not be started normally (RECOVER=1 was required). Fixed.
@changelog_1295_li
@changelog_1300_li
When a log file switch occurred in the middle of a sequence flush (sequences are only flushed every 32 values by default), the sequence value was lost. Fixed.
@changelog_1296_li
@changelog_1301_li
Altering a sequence didn't unlock the system table when autocommit switched off.
@changelog_1297_h2
@changelog_1302_h2
Version 1.0.68 (2008-03-18)
@changelog_1298_li
@changelog_1303_li
Very large SELECT DISTINCT and UNION EXCEPT queries are now supported, however this feature is disabled by default. To enable it, set the system property h2.maxMemoryRowsDistinct to a lower value, for example 10000.
@changelog_1299_li
@changelog_1304_li
A error is now thrown when trying to call a method inside a trigger that implicitly commits the current transaction, if an object is locked.
@changelog_1300_li
@changelog_1305_li
Unused LOB files were deleted much too late. Now they are deleted if no longer referenced in memory.
@changelog_1301_li
@changelog_1306_li
ALTER SEQUENCE and ALTER TABLE ALTER COLUMN RESTART can now be used inside a transaction.
@changelog_1302_li
@changelog_1307_li
New system property h2.aliasColumnName. When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the real table and column name in ResultSetMetaData.getTableName() and getColumnName(). This is disabled by default for compatibility with other databases (HSQLDB, Apache Derby, PostgreSQL, some version of MySQL). In version 1.1 this setting will be enabled.
@changelog_1303_li
@changelog_1308_li
When using encrypted databases, and using the wrong file password, the log file was renamed if the database was not already open. Fixed.
@changelog_1304_li
@changelog_1309_li
Improved performance when using lob files in directories (however this is still disabled by default)
@changelog_1305_li
@changelog_1310_li
H2 Console: autocomplete didn't work with very large scripts. Fixed.
@changelog_1306_li
@changelog_1311_li
Fulltext search: new method SEARCH_DATA that returns the column names and primary keys as arrays.
@changelog_1307_li
@changelog_1312_li
New experimental optimization for GROUP BY queries if an index can be used that matches the group by columns. To enable this optimization, set the system property h2.optimizeGroupSorted to true.
@changelog_1308_li
@changelog_1313_li
When using multi-version concurrency (MVCC=TRUE), duplicate rows could appear in the result set when running queries with uncommitted changes in the same session.
@changelog_1309_li
@changelog_1314_li
H2 Console: remote connections were very slow because getHostName/getRemoteHost was used. Fixed (now using getHostAddress/getRemoteAddr.
@changelog_1310_li
@changelog_1315_li
H2 Console: on Linux, Firefox, Konqueror, or Opera (in this order) are now started if available. This has been tested on Ubuntu.
@changelog_1311_li
@changelog_1316_li
H2 Console: the start window works better with IKVM
@changelog_1312_li
@changelog_1317_li
H2 Console: improved compatibility with Safari (Safari requires keep-alive)
@changelog_1313_li
@changelog_1318_li
Random: the process didn't stop if generating the random seed using the standard way (SecureRandom.generateSeed) was very slow. Now using a daemon thread to avoid this problem.
@changelog_1314_li
@changelog_1319_li
SELECT UNION with a different number of ORDER BY columns did throw an ArrayIndexOutOfBoundsException.
@changelog_1315_li
@changelog_1320_li
When using a view, the column precision was changed to the default scale for some data types.
@changelog_1316_li
@changelog_1321_li
CSVWRITE now supports a 'null string' that is used for parsing and writing NULL.
@changelog_1317_li
@changelog_1322_li
Some long running queries could not be canceled.
@changelog_1318_li
@changelog_1323_li
Queries with many outer join tables were very slow. Fixed.
@changelog_1319_li
@changelog_1324_li
The performance of text comparison has been improved when using locale sensitive string comparison (SET COLLATOR). Now CollationKey is used with a LRU cache. The default cache size is 10000, and can be changed using the system property h2.collatorCacheSize. Use 0 to disable the cache.
@changelog_1320_li
@changelog_1325_li
UPDATE SET column=DEFAULT is now supported.
@changelog_1321_h2
@changelog_1326_h2
Version 1.0.67 (2008-02-22)
@changelog_1322_li
@changelog_1327_li
New function FILE_READ to read a file or from an URL. Both binary and text data is supported.
@changelog_1323_li
@changelog_1328_li
CREATE TABLE AS SELECT now supports specifying the column list and data types.
@changelog_1324_li
@changelog_1329_li
Connecting to a TCP server and at shutting it down at the same time could cause a Java level deadlock.
@changelog_1325_li
@changelog_1330_li
A user now has all rights on his own local temporary tables.
@changelog_1326_li
@changelog_1331_li
The CSV tool now supports a custom lineSeparator.
@changelog_1327_li
@changelog_1332_li
When using multiple connections, empty space was reused too early sometimes. This could corrupt the database when recovering.
@changelog_1328_li
@changelog_1333_li
The H2 Console has been translated to Dutch. Thanks a lot to Remco Schoen!
@changelog_1329_li
@changelog_1334_li
Databases can now be opened even if trigger classes are not in the classpath. The exception is thrown when trying to fire the trigger.
@changelog_1330_li
@changelog_1335_li
Opening databases with ACCESS_MODE_DATA=r is now supported. In this case the database is read-only, but the files don't not need to be read-only.
@changelog_1331_li
@changelog_1336_li
Security: The database now waits 200 ms before throwing an exception if the user name or password don't match, to slow down dictionary attacks.
@changelog_1332_li
@changelog_1337_li
The value cache is now a soft reference cache. This should help save memory.
@changelog_1333_li
@changelog_1338_li
CREATE INDEX on a table with many rows could run out of memory. Fixed.
@changelog_1334_li
@changelog_1339_li
Large result sets are now a bit faster.
@changelog_1335_li
@changelog_1340_li
ALTER TABLE ALTER COLUMN RESTART and ALTER SEQUENCE now support parameters (any expressions).
@changelog_1336_li
@changelog_1341_li
When setting the base directory on the command line, the user directory prefix ('~') was ignored.
@changelog_1337_li
@changelog_1342_li
The DbStarter servlet didn't start the TCP listener even if configured.
@changelog_1338_li
@changelog_1343_li
Statement.setQueryTimeout() is now supported.
@changelog_1339_li
@changelog_1344_li
New session setting QUERY_TIMEOUT, and new system property h2.maxQueryTimeout.
@changelog_1340_li
@changelog_1345_li
Changing the transaction log level (SET LOG) is now written to the trace file by default.
@changelog_1341_li
@changelog_1346_li
In a SQL script, primary key constraints are now ordered before foreign key constraints.
@changelog_1342_li
@changelog_1347_li
It was not possible to create a referential constraint to a table in a different schema in some situations.
@changelog_1343_li
@changelog_1348_li
The H2 Console was slow when the database contains many tables. Now the column names are not shown in this case.
@changelog_1344_h2
@changelog_1349_h2
Version 1.0.66 (2008-02-02)
@changelog_1345_li
@changelog_1350_li
There is a new online error analyzer tool.
@changelog_1346_li
@changelog_1351_li
H2 Console: stack traces are now links to the source code in the source repository (H2 database only).
@changelog_1347_li
@changelog_1352_li
CHAR data type equals comparison was case insensitive instead of case sensitive.
@changelog_1348_li
@changelog_1353_li
The exception 'Value too long for column' now includes the data.
@changelog_1349_li
@changelog_1354_li
The table name was missing in the documentation of CREATE INDEX.
@changelog_1350_li
@changelog_1355_li
Better support for IKVM (www.ikvm.net): the H2 Console now opens a browser window.
@changelog_1351_li
@changelog_1356_li
The cache size was not correctly calculated for tables with large objects (specially if compression is used). This could lead to out-of-memory exceptions.
@changelog_1352_li
@changelog_1357_li
The exception "Hexadecimal string contains non-hex character" was not always thrown when it should have been. Fixed.
@changelog_1353_li
@changelog_1358_li
The H2 Console now provides a link to the documentation when an error occurs (H2 databases only so far).
@changelog_1354_li
@changelog_1359_li
The acting as PostgreSQL server, when a base directory was set, and the H2 Console was started as well, the base directory was applied twice.
@changelog_1355_li
@changelog_1360_li
Calling EXTRACT(HOUR FROM ...) or EXTRACT(HH FROM ...) returned the wrong values (0 to 11 instead of 0 to 23). All other tested databases return values from 0 to 23. Please check if your application relies on the old behavior before upgrading.
@changelog_1356_li
@changelog_1361_li
For compatibility with other databases the column default (COLUMN_DEF) for columns without default is now null (it was an empty string).
@changelog_1357_li
@changelog_1362_li
Statements that contain very large subqueries (where the subquery result does not fit in memory) are now faster.
@changelog_1358_li
@changelog_1363_li
Variables: large objects (CLOB and BLOB) that don't fit in memory did not work correctly when used as variables.
@changelog_1359_li
@changelog_1364_li
Fulltext search is now supported in named in-memory databases.
@changelog_1360_li
@changelog_1365_li
H2 Console: multiple consecutive spaces in the setting name did not work. Fixed.
@download_1000_h1
...
...
@@ -7400,40 +7415,40 @@ Asynchronous queries to support publish/subscribe: SELECT ... FOR READ WAIT [max
#The recover tool can be used to extract the contents of a data file, even if the database is corrupted. It also extracts the content of the log file or large objects (CLOB or BLOB). To run the tool, type on the command line:
@advanced_1214_p
現在のディレクトリのそれぞれのデータベースのために、テキストファイルが作られます。 このファイルには、データベースのスキーマを再び作成するために、行挿入ステートメント (データのための) と data definition (DDL) ステートメントを含んでいます。このファイルは、行挿入ステートメントが 正しいテーブル名を保持していないため、直接実行するこはできません。そのため、 ファイルは実行する前に手動で前処理を行う必要があります。
#For each database in the current directory, a text file will be created. This file contains raw insert statement (for the data) and data definition (DDL) statement to recreate the schema of the database. This file can be executed using the RunScript tool or a <code>RUNSCRIPT FROM</code> SQL statement. The script include at least one CREATE USER statement. If you run the script against a database that was created with the same user, or if there are conflicting users, running the script will fail. Consider running the script against a database that was created with a user name that is not in the script.
#In special cases (if the process did not terminate normally, for example because there was a power failure), the lock file is not deleted by the process that created it. That means the existence of the lock file is not a safe protocol for file locking. However, this software uses a challenge-response protocol to protect the database files. There are two methods (algorithms) implemented to provide both security (that is, the same database files cannot be opened by two processes at the same time) and simplicity (that is, the lock file does not need to be deleted manually by the user). The two methods are 'file method' and 'socket methods'.
@advanced_1218_h3
ファイルロックメソッド "File"
...
...
@@ -676,7 +676,7 @@ H2では、電源異常の後、1秒以上のコミットされたトランザ
ファイルロックメソッド "Socket"
@advanced_1225_p
実行される二つ目のロックメカニズムがありますが、 デフォルトでは使用不可です。アルゴリズムは:
#There is a second locking mechanism implemented, but disabled by default. To use it, append <code>;FILE_LOCK=SOCKET</code> to the database URL. The algorithm is:
もしロックファイルが存在し、ロックメソッドが "socket" なら、プロセスはポートが使用されているかチェックします。 最初のプロセスがまだ実行されていたら、ポートは使用されていれ、このプロセスは例外を投げます (database is in use)。 最初のプロセスが失われたら (例えば、停電または、仮想マシンの異常終了のため)、ポートは解除されます。 新しいプロセスはロックファイルを削除し、再び起動します。
#If the lock file exists, and the lock method is 'socket', then the process checks if the port is in use. If the original process is still running, the port is in use and this process throws an exception (database is in use). If the original process died (for example due to a power failure, or abnormal termination of the virtual machine), then the port was released. The new process deletes the lock file and starts again.
#Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
#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_1003_li
#Improved exception message when connecting to a just started server fails.
#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_1004_li
#Connection.isValid is a bit faster.
#The WebServlet did not close the database when un-deploying the web application.
@changelog_1005_li
#H2 Console: The autocomplete feature has been improved a bit. It can now better parse conditions.
#The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1006_li
#If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1007_li
#Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1008_li
#Improved exception message when connecting to a just started server fails.
@changelog_1009_li
#Connection.isValid is a bit faster.
@changelog_1010_li
#H2 Console: The autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1011_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_1007_h2
@changelog_1012_h2
#Version 1.1.107 (2009-01-24)
@changelog_1008_li
@changelog_1013_li
#Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1009_li
@changelog_1014_li
#The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1010_li
@changelog_1015_li
#When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1011_li
@changelog_1016_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_1012_li
@changelog_1017_li
#Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1013_h2
@changelog_1018_h2
#Version 1.1.106 (2009-01-04)
@changelog_1014_li
@changelog_1019_li
#Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1015_li
@changelog_1020_li
#CREATE DOMAIN: Built-in data types can now only be changed if no tables exist.
@changelog_1016_li
@changelog_1021_li
#Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1017_li
@changelog_1022_li
#DatabaseMetaData.getPrimaryKeys: The column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1018_li
@changelog_1023_li
#Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1019_li
@changelog_1024_li
#Views with IN(..) that used a view itself did not work.
@changelog_1020_li
@changelog_1025_li
#Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1021_li
@changelog_1026_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_1022_li
@changelog_1027_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_1023_li
@changelog_1028_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_1024_h2
@changelog_1029_h2
#Version 1.1.105 (2008-12-19)
@changelog_1025_li
@changelog_1030_li
#The setting STORAGE=TEXT is no longer supported.
@changelog_1026_li
@changelog_1031_li
#Deleting a database using the tool DeleteDbFiles deleted LOB files of other databases in the same directory.
@changelog_1027_li
@changelog_1032_li
#When used in a subquery, LIKE and IN(..) did not work correctly sometimes.
@changelog_1028_li
@changelog_1033_li
#The fulltext search documentation has been improved.
@changelog_1029_li
@changelog_1034_li
#ARRAY_GET returned the wrong data type (ARRAY). Now it returns VARCHAR.
@changelog_1030_li
@changelog_1035_li
#Natural join: the joined columns are not repeated any more when using SELECT *.
@changelog_1031_li
@changelog_1036_li
#User defined aggregate functions: the method getType expected internal data types instead of SQL types.
@changelog_1032_li
@changelog_1037_li
#User defined aggregate functions did not work if there was no group by expression.
@changelog_1033_li
@changelog_1038_li
#MySQL compatibility: support for := assignment as in @sum:=@sum+x
@changelog_1034_li
@changelog_1039_li
#INSERT INTO TEST(SELECT * FROM TEST) is now supported.
@changelog_1035_li
@changelog_1040_li
#Each session threw an invisible exception when garbage collected.
@changelog_1036_li
@changelog_1041_li
#Foreign key constraints that refer to a quoted column did not work.
@changelog_1037_li
@changelog_1042_li
#New meta data column INFORMATION_SCHEMA.TABLES.LAST_MODIFICATION to get the table modification counter.
@changelog_1038_li
@changelog_1043_li
#Shell: line comments didn't work correctly.
@changelog_1039_li
@changelog_1044_li
#H2 Console: Columns are now listed for up to 500 tables instead of 100.
@changelog_1040_li
@changelog_1045_li
#H2 Console: Cmd+Enter executes the current statement, Alt+Space for autocomplete.
@changelog_1041_li
@changelog_1046_li
#JaQu: the maximum length of a column can now be defined using maxLength. For an example, see Product.java (maxLength(category, 255)).
@changelog_1042_li
@changelog_1047_li
#R&\#305;dvan A&\#287;ar has completed the Turkish translation of the H2 Console. Thanks a lot!
@changelog_1043_h2
@changelog_1048_h2
#Version 1.1.104 (2008-11-28)
@changelog_1044_li
@changelog_1049_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_1045_li
@changelog_1050_li
#JaQu: tables are now auto-created when running a query.
@changelog_1046_li
@changelog_1051_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_1047_li
@changelog_1052_li
#The function SUM could overflow when using large values. It returns now a data type that is safe.
@changelog_1048_li
@changelog_1053_li
#The function AVG could overflow when using large values. Fixed.
@changelog_1049_li
@changelog_1054_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_1050_li
@changelog_1055_li
#Build: JAVA_HOME is now automatically detected on Mac OS X.
@changelog_1051_li
@changelog_1056_li
#Testing for local connections was very slow on some systems.
@changelog_1052_li
@changelog_1057_li
#The cache memory usage calculation is more conservative.
@changelog_1053_li
@changelog_1058_li
#Allocating space got slower and slower the larger the database.
@changelog_1054_li
@changelog_1059_li
#ALTER TABLE ALTER COLUMN could throw the wrong exception in the last version (Table not found).
@changelog_1055_li
@changelog_1060_li
#Updatable result sets: the key columns can now be updated.
@changelog_1056_li
@changelog_1061_li
#The H2DatabaseProvider for ActiveObjects is now included in the tools section.
@changelog_1057_li
@changelog_1062_li
#The H2Platform for Oracle Toplink Essential has been improved a bit.
@changelog_1058_li
@changelog_1063_li
#The Windows service to start H2 didn't work in version 1.1.
@changelog_1059_li
@changelog_1064_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_1060_li
@changelog_1065_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_1061_li
@changelog_1066_li
#Compatibility for MS SQL Server DATEDIFF(YYYY, .., ..)
@changelog_1062_li
@changelog_1067_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_1063_li
@changelog_1068_li
#The interface CloseListener has a new method 'remove' that is called when the trigger is dropped.
@changelog_1064_li
@changelog_1069_li
#Fulltext search: there was a memory leak when creating and dropping fulltext indexes in a loop.
@changelog_1065_h2
@changelog_1070_h2
#Version 1.1.103 (2008-11-07)
@changelog_1066_li
@changelog_1071_li
#Could not order by a formula when the formula was in the group by list but not in the select list.
@changelog_1067_li
@changelog_1072_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_1068_li
@changelog_1073_li
#ALTER TABLE used a lot of memory when using multi-version concurrency.
@changelog_1069_li
@changelog_1074_li
#Referential integrity for in-memory databases didn't work in some cases in version 1.1.102.
@changelog_1070_li
@changelog_1075_li
#New column INFORMATION_SCHEMA.COLUMNS.SEQUENCE_NAME to get the name of the sequence for auto-increment columns.
@changelog_1071_li
@changelog_1076_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_1072_li
@changelog_1077_li
#The Japanese translation has been completed by Masahiro Ikemoto. Thanks a lot!
@changelog_1073_li
@changelog_1078_li
#Improved PostgreSQL compatibility for NEXTVAL and CURRVAL.
@changelog_1074_li
@changelog_1079_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_1075_li
@changelog_1080_li
#New system property h2.browser to set the browser to use.
@changelog_1076_li
@changelog_1081_li
#To start the browser, java.awt.Desktop.browse is now used if available.
@changelog_1077_h2
@changelog_1082_h2
#Version 1.1.102 (2008-10-24)
@changelog_1078_li
@changelog_1083_li
#The French translation of the H2 Console has been improved by Olivier Parent. Thanks a lot!
@changelog_1079_li
@changelog_1084_li
#There was a memory leak when creating and dropping tables and indexes in a loop (persistent database only).
@changelog_1080_li
@changelog_1085_li
#SET LOG 2 was not effective if executed after opening the database.
@changelog_1081_li
@changelog_1086_li
#Translating the H2 Console is now simpler.
@changelog_1082_li
@changelog_1087_li
#Common exception (error code 23*) are no longer written to the .trace.db file by default.
@changelog_1083_li
@changelog_1088_li
#In-memory databases don't write LOBs to files any longer.
@changelog_1084_li
@changelog_1089_li
#Self referencing constraints didn't restrict deleting rows that reference itself if there is another row that references it.
@changelog_1085_li
@changelog_1090_li
#ResultSetMetaData.getColumnName now returns the alias name except for columns.
@changelog_1086_li
@changelog_1091_li
#Temporary files are now deleted when the database is closed, even if they were not garbage collected so far.
@changelog_1087_h2
@changelog_1092_h2
#Version 1.1.101 (2008-10-17)
@changelog_1088_li
@changelog_1093_li
#Errors with code 42000 - 42999 are no longer written to the trace file by default.
@changelog_1089_li
@changelog_1094_li
#Queries with more than 10 tables are now faster.
@changelog_1090_li
@changelog_1095_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_1091_li
@changelog_1096_li
#IF [NOT] EXISTS is supported for named constraints in ALTER TABLE ... ADD/DROP CONSTRAINT.
@changelog_1092_li
@changelog_1097_li
#The error messages have been translated to Spanish by Dario V. Fassi. Thanks a lot!
@changelog_1093_li
@changelog_1098_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_1094_li
@changelog_1099_li
#Opening large database is now faster.
@changelog_1095_li
@changelog_1100_li
#New system property h2.socketConnectTimeout, the timeout in milliseconds to connect to a server. The default is 2000 (2 seconds).
@changelog_1096_li
@changelog_1101_li
#The wrong parameters were bound to subqueries with parameters, specially when using IN(SELECT ...) and IN(...).
@changelog_1097_li
@changelog_1102_li
#Unset parameters were not detected when the query was re-compiled.
@changelog_1098_li
@changelog_1103_li
#New functions ISO_YEAR, ISO_WEEK, ISO_DAY_OF_WEEK. Thanks a lot to Robert Rathsack for implementing those!
@changelog_1099_li
@changelog_1104_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_1100_li
@changelog_1105_li
#An out of memory error while deleting or updating many rows could result in a strange exception.
@changelog_1101_li
@changelog_1106_li
#Linked tables: compatibility with MS SQL Server has been improved.
@changelog_1102_li
@changelog_1107_li
#Renaming tables that have foreign keys with cascade didn't work correctly.
@changelog_1103_li
@changelog_1108_li
#The auto-reconnect feature didn't work when using the auto-server mode. Fixed.
@changelog_1104_li
@changelog_1109_li
#Fulltext search: new method FT_DROP_INDEX.
@changelog_1105_li
@changelog_1110_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_1106_li
@changelog_1111_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_1107_li
@changelog_1112_li
#The default value for MAX_MEMORY_UNDO is now 50000.
@changelog_1108_li
@changelog_1113_li
#For alias columns, ResultSetMetaData.getTableName() and getColumnName() now return the real table and column name in the default mode.
@changelog_1109_li
@changelog_1114_li
#In SQL scripts created with SCRIPT TO, schemas are now only created if they don't exist yet.
@changelog_1110_li
@changelog_1115_li
#After re-connecting to a database, the database event listener (if set) is informed about it.
@changelog_1111_li
@changelog_1116_li
#Local temporary tables now support indexes. Thanks a lot to Matt Roy!
@changelog_1112_li
@changelog_1117_li
#RUNSCRIPT no longer uses a temporary file.
@changelog_1113_li
@changelog_1118_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_1114_li
@changelog_1119_li
#After an automatic re-connect, part of the session state stays (the part that is stored in the SESSION_STATE table).
@changelog_1115_li
@changelog_1120_li
#The build didn't work if the directory temp didn't exist before.
@changelog_1116_li
@changelog_1121_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_1117_li
@changelog_1122_li
#WHERE .. IN (SELECT ...) could throw a NullPointerException.
@changelog_1118_li
@changelog_1123_li
#Improved Glassfish / Toplink support in H2Platform thanks to Marcio Borges from Brazil. Thanks a lot!
@changelog_1119_h2
@changelog_1124_h2
#Version 1.1.100 (2008-10-04)
@changelog_1120_li
@changelog_1125_li
#In version 1.1, the following system properties are now enabled by default: h2.lobFilesInDirectories, h2.optimizeGroupSorted, h2.optimizeInJoin, h2.shareLinkedConnections
@changelog_1121_li
@changelog_1126_li
#The H2 Console tool now works with the JDBC-ODBC bridge.
@changelog_1122_li
@changelog_1127_li
#The H2 Console tool now supports command line options to start things separately.
@changelog_1123_li
@changelog_1128_li
#Large objects did not work for in-memory databases in server mode in Linux.
@changelog_1124_li
@changelog_1129_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_1125_li
@changelog_1130_li
#The h2console.war can now be built using the Java build.
@changelog_1126_li
@changelog_1131_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_1127_li
@changelog_1132_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_1128_li
@changelog_1133_li
#CreateCluster: the property 'serverlist' is now called 'serverList'.
@changelog_1129_li
@changelog_1134_li
#The ConvertTraceFile tool could not parse some files because the trace mechanism did not encode prepared statement parameters.
@changelog_1130_li
@changelog_1135_li
#Databases names can now be one character long (the minimum size used to be 2 characters).
@changelog_1131_h2
@changelog_1136_h2
#Version 1.0.79 (2008-09-26)
@changelog_1132_li
@changelog_1137_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_1133_li
@changelog_1138_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_1134_li
@changelog_1139_li
#The server tool now displays the correct IP address if networked.
@changelog_1135_li
@changelog_1140_li
#Can now start a TCP server with port 0 (automatically select a port).
@changelog_1136_li
@changelog_1141_li
#Result sets with just a unique index can now be updated (previously a primary key was required).
@changelog_1137_li
@changelog_1142_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_1138_li
@changelog_1143_li
#LINKED TABLE: worked around a bug in Oracle with the CHAR data type.
@changelog_1139_li
@changelog_1144_li
#Faster hash code calculation for large binary arrays.
@changelog_1140_li
@changelog_1145_li
#Faster storage re-use algorithm thanks to Greg Dhuse from cleversafe.com.
@changelog_1141_li
@changelog_1146_li
#The database supports the SHOW command for better MySQL and PostgreSQL compatibility.
@changelog_1142_li
@changelog_1147_li
#The H2 Console now abbreviates large texts in results.
@changelog_1143_li
@changelog_1148_li
#Multiple UNION queries could not be used in derived tables.
@changelog_1144_li
@changelog_1149_li
#Linked tables can now be read-only.
@changelog_1145_li
@changelog_1150_li
#Temporary linked tables are now supported.
@changelog_1146_li
@changelog_1151_li
#It was possible to create tables in read-only databases.
@changelog_1147_li
@changelog_1152_li
#SET SCHEMA_SEARCH_PATH is now documented.
@changelog_1148_li
@changelog_1153_li
#SET SCHEMA did not work for views.
@changelog_1149_li
@changelog_1154_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_1150_li
@changelog_1155_li
#The maximum log file size setting was ignored for large databases.
@changelog_1151_li
@changelog_1156_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_1152_li
@changelog_1157_li
#The data type JAVA_OBJECT could not be used in updatable result sets.
@changelog_1153_li
@changelog_1158_li
#The system property h2.optimizeInJoin did not work correctly.
@changelog_1154_li
@changelog_1159_li
#Conditions such as ID=? AND ID>? were slow.
@changelog_1155_h2
@changelog_1160_h2
#Version 1.0.78 (2008-08-28)
@changelog_1156_li
@changelog_1161_li
#The documentation no longer uses a frameset (except the Javadocs).
@changelog_1157_li
@changelog_1162_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_1158_li
@changelog_1163_li
#Java methods with variable number of parameters can now be used (for Java 1.5 or newer).
@changelog_1159_li
@changelog_1164_li
#The Japanese translation has been improved by Masahiro Ikemoto. Thanks a lot!
@changelog_1160_li
@changelog_1165_li
#The H2 Console replaced an empty user name with a single space.
@changelog_1161_li
@changelog_1166_li
#The build target 'build jarSmall' now includes the embedded database.
@changelog_1162_li
@changelog_1167_li
#JdbcDataSource now keeps the password in a char array where possible.
@changelog_1163_li
@changelog_1168_li
#ResultSet.absolute did not always work with large result sets.
@changelog_1164_li
@changelog_1169_li
#Column aliases can now be used in GROUP BY and HAVING.
@changelog_1165_li
@changelog_1170_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_1166_h2
@changelog_1171_h2
#Version 1.0.77 (2008-08-16)
@changelog_1167_li
@changelog_1172_li
#JaQu is now using prepared statements and supports Date, Time, Timestamp.
@changelog_1168_li
@changelog_1173_li
#When using remote in-memory databases, large LOB objects did not work.
@changelog_1169_li
@changelog_1174_li
#Timestamp columns such as TIMESTAMP(6) were not compatible to other database.
@changelog_1170_li
@changelog_1175_li
#Opening a large database was slow if there was a problem opening the previous time.
@changelog_1171_li
@changelog_1176_li
#NOT IN(SELECT ...) was incorrect if the subquery returns no rows.
@changelog_1172_li
@changelog_1177_li
#CREATE TABLE AS SELECT did not work correctly in the multi-version concurrency mode.
@changelog_1173_li
@changelog_1178_li
#Support a comma before closing a list, as in: create table test(id int,)
@changelog_1174_li
@changelog_1179_li
#MySQL compatibility: linked tables had lower case column names on some systems.
@changelog_1175_li
@changelog_1180_li
#DB2 compatibility: the DB2 fetch-first-clause is supported.
@changelog_1176_li
@changelog_1181_li
#Oracle compatibility: old style outer join syntax using (+) did work correctly sometimes.
@changelog_1177_li
@changelog_1182_li
#ResultSet.setFetchSize is now supported.
@changelog_1178_li
@changelog_1183_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_1179_h2
@changelog_1184_h2
#Version 1.0.76 (2008-07-27)
@changelog_1180_li
@changelog_1185_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_1181_li
@changelog_1186_li
#Invalid database names are now detected and a better error message is thrown.
@changelog_1182_li
@changelog_1187_li
#ResultSetMetaData.getColumnClassName now returns the correct class name for BLOB and CLOB.
@changelog_1183_li
@changelog_1188_li
#Fixed the Oracle mode: Oracle allows multiple rows only where all columns of the unique index are NULL.
@changelog_1184_li
@changelog_1189_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_1185_li
@changelog_1190_li
#ORDER BY on tableName.columnName didn't work correctly if the column name was also used as an alias.
@changelog_1186_li
@changelog_1191_li
#H2 Console: The progress display when opening a database has been improved.
@changelog_1187_li
@changelog_1192_li
#The error message when the server doesn't start has been improved.
@changelog_1188_li
@changelog_1193_li
#Key values can now be changed in updatable result sets.
@changelog_1189_li
@changelog_1194_li
#Changes in updatable result sets are now visible even when resetting the result set.
@changelog_1190_li
@changelog_1195_li
#Temporary files were sometimes deleted too late when executing large insert, update, or delete operations.
@changelog_1191_li
@changelog_1196_li
#The database file was growing after deleting many rows, and after large update operations.
@changelog_1192_h2
@changelog_1197_h2
#Version 1.0.75 (2008-07-14)
@changelog_1193_li
@changelog_1198_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_1194_li
@changelog_1199_li
#Views with multiple joined tables (where one was an outer join) couldn't be used in some cases. Fixed.
@changelog_1195_li
@changelog_1200_li
#The CSVREAD method did not process NULL correctly when using a whitespace field separator.
@changelog_1196_li
@changelog_1201_li
#Fixed the Oracle mode: Oracle allows multiple rows with NULL in a unique index.
@changelog_1197_li
@changelog_1202_li
#Running out of memory could result in incomplete transactions or corrupted databases. Fixed.
@changelog_1198_li
@changelog_1203_li
#When using order by in a query that uses the same table multiple times, the order could be incorrect. Fixed.
@changelog_1199_li
@changelog_1204_li
#Referential constraint checking improvement: now the constraint is only checked if the key column values change.
@changelog_1200_li
@changelog_1205_li
#Some database metadata calls returned the wrong data type for DATA_TYPE columns.
@changelog_1201_li
@changelog_1206_li
#The Lucene fulltext index was empty when opening a database with fulltext index enabled, and re-indexing it didn't work. Fixed.
@changelog_1202_li
@changelog_1207_li
#The character '$' could not be used in identifier names (table name, column names and so on). Fixed.
@changelog_1203_li
@changelog_1208_li
#The new method org.h2.tools.Server.startWebServer(conn) starts the H2 Console to inspect a database while debugging.
@changelog_1204_li
@changelog_1209_li
#Stopping a WebServer didn't always work. Fixed.
@changelog_1205_h2
@changelog_1210_h2
#Version 1.0.74 (2008-06-21)
@changelog_1206_li
@changelog_1211_li
#Work on row level locking has been started (but there is nothing usable yet).
@changelog_1207_li
@changelog_1212_li
#JaQu (Java Query), a tool similar to LINQ (Language Integrated Query; from Microsoft) is now included under src/tools/org/h2/jaqu. A small sample application is included under src/test/org/h2/test/jaqu.
@changelog_1208_li
@changelog_1213_li
#The source code is now switched to Java 1.6 by default. To switch back to Java 1.4, run 'build compile'. The h2.jar file is still Java 1.4.
@changelog_1209_li
@changelog_1214_li
#The ChangePassword tool is now called ChangeFileEncryption.
@changelog_1210_li
@changelog_1215_li
#It is no longer allowed to create columns with the data type NULL. Also, it is no longer allowed to convert a column to the data type NULL. This was possible before but caused data loss.
@changelog_1211_li
@changelog_1216_li
#When using computed columns or default values with a different data type than the column data type, a class cast exception could occur. Fixed.
@changelog_1212_li
@changelog_1217_li
#Opening databases larger than 1 GB was sometimes very slow if a lot of data was deleted previously. Fixed.
@changelog_1213_li
@changelog_1218_li
#RUNSCRIPT could throw a NullPointerException if the script name was an expression.
@changelog_1214_li
@changelog_1219_li
#Improved compatibility. New compatibility modes for Oracle and Derby. New compatibility flag uniqueIndexNullDistinct to only allow one row with 'NULL' in a unique index. This flag is enabled for Derby, Oracle, MSSQLServer, and HSQLDB.
@changelog_1215_li
@changelog_1220_li
#Linked tables: To view the statements that are executed against the target table, set the trace level to 3.
@changelog_1216_li
@changelog_1221_li
#RunScript tool: new options to show and check the results of queries.
@changelog_1217_li
@changelog_1222_li
#Deadlocks are now detected. One transaction is rolled back automatically.
@changelog_1218_li
@changelog_1223_li
#The Lucene fulltext index was always re-created when opening a database with fulltext index enabled.
@changelog_1219_li
@changelog_1224_li
#Support for overloaded Java methods. A user defined function can now be bound to multiple Java methods, if the Java methods have the same name but a different number of parameters. Thanks to Gary Tong for providing a patch!
@changelog_1220_h2
@changelog_1225_h2
#Version 1.0.73 (2008-05-31)
@changelog_1221_li
@changelog_1226_li
#ParameterMetaData now returns the right data type for most conditions, as in WHERE ID=?.
@changelog_1222_li
@changelog_1227_li
#The table SYSTEM_RANGE now supports expressions and parameters.
@changelog_1223_li
@changelog_1228_li
#New column INFORMATION_SCHEMA.CONSTRAINTS.UNIQUE_INDEX_NAME that contains the name of the unique index used to enforce this constraint, if there is such an index.
@changelog_1224_li
@changelog_1229_li
#SET QUERY_TIMEOUT and Statement.setQueryTimeout no longer commits a transaction. The same applies to SET @VARIABLE, SET LOCK_TIMEOUT, SET TRACE_LEVEL_*, SET THROTTLE, and SET PATH.
@changelog_1225_li
@changelog_1230_li
#The SCRIPT command does now emit IF NOT EXISTS for CREATE ROLE.
@changelog_1226_li
@changelog_1231_li
#MySQL compatibility: auto_increment column are no longer automatically converted to primary key columns.
@changelog_1227_li
@changelog_1232_li
#PostgreSQL compatibility: support for BOOL_OR and BOOL_AND aggregate functions.
@changelog_1228_li
@changelog_1233_li
#Negative scale values for DECIMAL or NUMBER columns are now supported in regular tables and in linked tables.
@changelog_1229_li
@changelog_1234_li
#A role or right can now be granted or revoked multiple times without getting an exception.
@changelog_1230_li
@changelog_1235_li
#Infinite numbers in SQL scripts are listed as POWER(0, -1)), negative infinite as (-POWER(0, -1)), and NaN (not a number) as SQRT(-1).
@changelog_1231_li
@changelog_1236_li
#The special double and float values 'NaN' (not a number) did not work correctly when sorting or comparing.
@changelog_1232_li
@changelog_1237_li
#The fulltext search did not support CLOB data types.
@changelog_1233_li
@changelog_1238_li
#If the drive with the database files was disconnected or unmounted while writing, sometimes a stack overflow exception was thrown instead of a IO exception.
@changelog_1234_li
@changelog_1239_li
#The H2 Console could not be shut down from within the tool if the browser supports keepAlive (most browsers do).
@changelog_1235_li
@changelog_1240_li
#If the password was passed as a char array, it was kept in an internal buffer longer than required. Theoretically the password could have been stolen if the main memory was swapped to disk before the garbage collection was run.
@changelog_1236_h2
@changelog_1241_h2
#Version 1.0.72 (2008-05-10)
@changelog_1237_li
@changelog_1242_li
#Some databases could not be opened when appending ;RECOVER=1 to the database URL.
@changelog_1238_li
@changelog_1243_li
#The Japanese translation of the error messages and the H2 Console has been completed by Masahiro Ikemoto (Arizona Design Inc.)
@changelog_1239_li
@changelog_1244_li
#Updates made to updatable rows are now visible within the same result set. DatabaseMetaData.ownUpdatesAreVisible now returns true.
@changelog_1240_li
@changelog_1245_li
#ParameterMetaData now returns the correct data for INSERT and UPDATE statements.
@changelog_1241_li
@changelog_1246_li
#H2 Shell: DESCRIBE now supports an schema name.
@changelog_1242_li
@changelog_1247_li
#A subset of the PostgreSQL 'dollar quoting' feature is now supported.
@changelog_1243_li
@changelog_1248_li
#SLF4J is now supported by using adding TRACE_LEVEL_FILE=4 to the database URL.
@changelog_1244_li
@changelog_1249_li
#The recovery tool did not work if the table name contained spaces or if there was a comment on the table.
@changelog_1245_li
@changelog_1250_li
#Triggers are no longer executed when changing the table structure (ALTER TABLE).
@changelog_1246_li
@changelog_1251_li
#When setting BLOB or CLOB values larger than 65 KB using a remote connection, temporary files were kept on the client longer than required (until the connection was closed or the object is garbage collected). Now they are removed as soon as the PreparedStatement is closed, or when the value is overwritten.
@changelog_1247_li
@changelog_1252_li
#Statements can now be canceled remotely (when using remote connections).
@changelog_1248_li
@changelog_1253_li
#The Shell tool now uses java.io.Console to read the password when using JDK 1.6
@changelog_1249_li
@changelog_1254_li
#When using read-only databases and setting LOG=2, an exception was written to the trace file when closing the database. Fixed.
@changelog_1250_h2
@changelog_1255_h2
#Version 1.0.71 (2008-04-25)
@changelog_1251_li
@changelog_1256_li
#H2 is now dual-licensed under the Eclipse Public License (EPL) and the old 'H2 License' (which is basically MPL).
@changelog_1252_li
@changelog_1257_li
#Sometimes an exception 'File ID mismatch' or 'try to add a record twice' occurred after large records (8 KB or larger) are updated or deleted. See also http://code.google.com/p/h2database/issues/detail?id=22
@changelog_1253_li
@changelog_1258_li
#H2 Console: The tools can now be translated (it didn't work in the last release).
@changelog_1254_li
@changelog_1259_li
#New traditional Chinese translation. Thanks a lot to Derek Chao!
@changelog_1255_li
@changelog_1260_li
#Indexes were not used when enabling the optimization for IN(SELECT...) (system property h2.optimizeInJoin).
@changelog_1256_h2
@changelog_1261_h2
#Version 1.0.70 (2008-04-20)
@changelog_1257_li
@changelog_1262_li
#The plan is to dual-license H2. The additional license is EPL (Eclipse Public License). The current license (MPL, Mozilla Public License) will stay. Current users are not affected because they can keep MPL. EPL is very similar to MPL, the only bigger difference is related to patents (EPL is a bit more business friendly in this regard). See also http://opensource.org/licenses/eclipse-1.0.php, http://www.eclipse.org/legal/eplfaq.php (FAQ), http://blogs.zdnet.com/Burnette/?p=131
@changelog_1258_li
@changelog_1263_li
#Multi version concurrency (MVCC): when a row was updated, and the updated column was not indexed, this update was visible sometimes for other sessions even if it was not committed.
@changelog_1259_li
@changelog_1264_li
#Calling SHUTDOWN on one connection and starting a query on another connection concurrently could result in a Java level deadlock.
@changelog_1260_li
@changelog_1265_li
#New system property h2.enableAnonymousSSL (default: true) to enable anonymous SSL connections.
@changelog_1261_li
@changelog_1266_li
#The precision if SUBSTR is now calculated if possible.
@changelog_1262_li
@changelog_1267_li
#The autocomplete in the H2 Console has been improved a bit.
@changelog_1263_li
@changelog_1268_li
#The tools in the H2 Console are now translatable.
@changelog_1264_li
@changelog_1269_li
#The servlet and lucene jar files are now automatically downloaded when building.
@changelog_1265_li
@changelog_1270_li
#The code switch tool has been replaced by a simpler tool called SwitchSource that just uses find and replace.
@changelog_1266_li
@changelog_1271_li
#Started to write a Ant replacement ('JAnt') that uses pure Java build definitions. Advantages: ability to debug the build, extensible, flexible, no XML, a bit faster. Future plan: support creating custom h2 distributions (for embedded use). Maybe create a new project 'Jant' or 'Javen' if other people are interested.
@changelog_1267_li
@changelog_1272_li
#The jar file is now about 10% smaller because the variable debugging info is no longer included. The source file and line number debugging info is still included. If required, the jar file size of the full version can be further reduced to about 720 KB using 'build jarSmall' or even more by removing unneeded components.
@changelog_1268_li
@changelog_1273_li
#Added shell scripts run.sh and build.sh. chmod +x is required, but otherwise it should work. Feedback or improvements are welcome!
@changelog_1269_li
@changelog_1274_li
#Databases in zip files: large queries are now supported. Temp files are created in the temp directory if required. The documentation how to create the zip file has been corrected.
#The Japanese translation of the error messages and the H2 Console has been improved. Thanks a lot to Masahiro IKEMOTO.
@changelog_1272_li
@changelog_1277_li
#Optimization for MIN() and MAX() when using MVCC.
@changelog_1273_li
@changelog_1278_li
#To protect against remote brute force password attacks, the delay after each unsuccessful login now gets double as long. New system properties h2.delayWrongPasswordMin and h2.delayWrongPasswordMax.
@changelog_1274_li
@changelog_1279_li
#After setting the query timeout and then resetting it, the next query would still timeout. Fixed.
@changelog_1275_li
@changelog_1280_li
#Adding a IDENTITY column to a table with data threw a lock timeout.
@changelog_1276_li
@changelog_1281_li
#OutOfMemoryError could occur when using EXISTS or IN(SELECT ..).
@changelog_1277_li
@changelog_1282_li
#The built-in connection pool is not called JdbcConnectionPool. The API and documentation has been changed.
@changelog_1278_li
@changelog_1283_li
#The ConvertTraceFile tool now generates SQL statement statistics at the end of the SQL script file (similar to the profiling data generated when using java -Xrunhprof).
@changelog_1279_li
@changelog_1284_li
#Nested joins are now supported (A JOIN B JOIN C ON .. ON ..)
@changelog_1280_h2
@changelog_1285_h2
#Version 1.0.69 (2008-03-29)
@changelog_1281_li
@changelog_1286_li
#Most command line tools can now be called from within the H2 Console.
@changelog_1282_li
@changelog_1287_li
#A new Shell tools is now included (org.h2.tools.Shell) to query a database from the command line.
@changelog_1283_li
@changelog_1288_li
#The command line options in the tools have changed: instead of '-log true' now '-trace' is used. Also, '-ifExists', '-tcpSSL' and '-tcpAllowOthers' and so on have changed: now the 'true' is no longer needed. The old behavior is still supported.
@changelog_1284_li
@changelog_1289_li
#New system property h2.sortNullsHigh to invert the default sorting behavior for NULL. The default didn't change.
@changelog_1285_li
@changelog_1290_li
#Performance was very slow when using LOG=2 and deleting or updating all rows of a table in a loop. Fixed.
@changelog_1286_li
@changelog_1291_li
#ALTER TABLE or CREATE TABLE now support parameters for the password field.
@changelog_1287_li
@changelog_1292_li
#The linear hash has been removed. It was always slower than the b-tree index, and there were some bugs that would be hard to fix.
@changelog_1288_li
@changelog_1293_li
#TRACE_LEVEL_ settings are no longer persistent. This was a problem when database initialization code caused a lot of trace output.
@changelog_1289_li
@changelog_1294_li
#Fulltext search (native implementation): The words table is no longer an in-memory table because this caused memory problems in some cases.
@changelog_1290_li
@changelog_1295_li
#It was possible to create a role with the name as an existing user (but not vice versa). This is not allowed any more.
@changelog_1291_li
@changelog_1296_li
#The recovery tool didn't work correctly for tables without rows.
@changelog_1292_li
@changelog_1297_li
#For years below 1, the YEAR method didn't return the correct value, and the conversion from date and timestamp to varchar was incorrect.
@changelog_1293_li
@changelog_1298_li
#CSVWRITE caused a NullPointerException when not specifying a nullString.
@changelog_1294_li
@changelog_1299_li
#When a log file switch occurred just after a truncate table or drop table statement, the database could not be started normally (RECOVER=1 was required). Fixed.
@changelog_1295_li
@changelog_1300_li
#When a log file switch occurred in the middle of a sequence flush (sequences are only flushed every 32 values by default), the sequence value was lost. Fixed.
@changelog_1296_li
@changelog_1301_li
#Altering a sequence didn't unlock the system table when autocommit switched off.
@changelog_1297_h2
@changelog_1302_h2
#Version 1.0.68 (2008-03-18)
@changelog_1298_li
@changelog_1303_li
#Very large SELECT DISTINCT and UNION EXCEPT queries are now supported, however this feature is disabled by default. To enable it, set the system property h2.maxMemoryRowsDistinct to a lower value, for example 10000.
@changelog_1299_li
@changelog_1304_li
#A error is now thrown when trying to call a method inside a trigger that implicitly commits the current transaction, if an object is locked.
@changelog_1300_li
@changelog_1305_li
#Unused LOB files were deleted much too late. Now they are deleted if no longer referenced in memory.
@changelog_1301_li
@changelog_1306_li
#ALTER SEQUENCE and ALTER TABLE ALTER COLUMN RESTART can now be used inside a transaction.
@changelog_1302_li
@changelog_1307_li
#New system property h2.aliasColumnName. When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the real table and column name in ResultSetMetaData.getTableName() and getColumnName(). This is disabled by default for compatibility with other databases (HSQLDB, Apache Derby, PostgreSQL, some version of MySQL). In version 1.1 this setting will be enabled.
@changelog_1303_li
@changelog_1308_li
#When using encrypted databases, and using the wrong file password, the log file was renamed if the database was not already open. Fixed.
@changelog_1304_li
@changelog_1309_li
#Improved performance when using lob files in directories (however this is still disabled by default)
@changelog_1305_li
@changelog_1310_li
#H2 Console: autocomplete didn't work with very large scripts. Fixed.
@changelog_1306_li
@changelog_1311_li
#Fulltext search: new method SEARCH_DATA that returns the column names and primary keys as arrays.
@changelog_1307_li
@changelog_1312_li
#New experimental optimization for GROUP BY queries if an index can be used that matches the group by columns. To enable this optimization, set the system property h2.optimizeGroupSorted to true.
@changelog_1308_li
@changelog_1313_li
#When using multi-version concurrency (MVCC=TRUE), duplicate rows could appear in the result set when running queries with uncommitted changes in the same session.
@changelog_1309_li
@changelog_1314_li
#H2 Console: remote connections were very slow because getHostName/getRemoteHost was used. Fixed (now using getHostAddress/getRemoteAddr.
@changelog_1310_li
@changelog_1315_li
#H2 Console: on Linux, Firefox, Konqueror, or Opera (in this order) are now started if available. This has been tested on Ubuntu.
@changelog_1311_li
@changelog_1316_li
#H2 Console: the start window works better with IKVM
@changelog_1312_li
@changelog_1317_li
#H2 Console: improved compatibility with Safari (Safari requires keep-alive)
@changelog_1313_li
@changelog_1318_li
#Random: the process didn't stop if generating the random seed using the standard way (SecureRandom.generateSeed) was very slow. Now using a daemon thread to avoid this problem.
@changelog_1314_li
@changelog_1319_li
#SELECT UNION with a different number of ORDER BY columns did throw an ArrayIndexOutOfBoundsException.
@changelog_1315_li
@changelog_1320_li
#When using a view, the column precision was changed to the default scale for some data types.
@changelog_1316_li
@changelog_1321_li
#CSVWRITE now supports a 'null string' that is used for parsing and writing NULL.
@changelog_1317_li
@changelog_1322_li
#Some long running queries could not be canceled.
@changelog_1318_li
@changelog_1323_li
#Queries with many outer join tables were very slow. Fixed.
@changelog_1319_li
@changelog_1324_li
#The performance of text comparison has been improved when using locale sensitive string comparison (SET COLLATOR). Now CollationKey is used with a LRU cache. The default cache size is 10000, and can be changed using the system property h2.collatorCacheSize. Use 0 to disable the cache.
@changelog_1320_li
@changelog_1325_li
#UPDATE SET column=DEFAULT is now supported.
@changelog_1321_h2
@changelog_1326_h2
#Version 1.0.67 (2008-02-22)
@changelog_1322_li
@changelog_1327_li
#New function FILE_READ to read a file or from an URL. Both binary and text data is supported.
@changelog_1323_li
@changelog_1328_li
#CREATE TABLE AS SELECT now supports specifying the column list and data types.
@changelog_1324_li
@changelog_1329_li
#Connecting to a TCP server and at shutting it down at the same time could cause a Java level deadlock.
@changelog_1325_li
@changelog_1330_li
#A user now has all rights on his own local temporary tables.
@changelog_1326_li
@changelog_1331_li
#The CSV tool now supports a custom lineSeparator.
@changelog_1327_li
@changelog_1332_li
#When using multiple connections, empty space was reused too early sometimes. This could corrupt the database when recovering.
@changelog_1328_li
@changelog_1333_li
#The H2 Console has been translated to Dutch. Thanks a lot to Remco Schoen!
@changelog_1329_li
@changelog_1334_li
#Databases can now be opened even if trigger classes are not in the classpath. The exception is thrown when trying to fire the trigger.
@changelog_1330_li
@changelog_1335_li
#Opening databases with ACCESS_MODE_DATA=r is now supported. In this case the database is read-only, but the files don't not need to be read-only.
@changelog_1331_li
@changelog_1336_li
#Security: The database now waits 200 ms before throwing an exception if the user name or password don't match, to slow down dictionary attacks.
@changelog_1332_li
@changelog_1337_li
#The value cache is now a soft reference cache. This should help save memory.
@changelog_1333_li
@changelog_1338_li
#CREATE INDEX on a table with many rows could run out of memory. Fixed.
@changelog_1334_li
@changelog_1339_li
#Large result sets are now a bit faster.
@changelog_1335_li
@changelog_1340_li
#ALTER TABLE ALTER COLUMN RESTART and ALTER SEQUENCE now support parameters (any expressions).
@changelog_1336_li
@changelog_1341_li
#When setting the base directory on the command line, the user directory prefix ('~') was ignored.
@changelog_1337_li
@changelog_1342_li
#The DbStarter servlet didn't start the TCP listener even if configured.
@changelog_1338_li
@changelog_1343_li
#Statement.setQueryTimeout() is now supported.
@changelog_1339_li
@changelog_1344_li
#New session setting QUERY_TIMEOUT, and new system property h2.maxQueryTimeout.
@changelog_1340_li
@changelog_1345_li
#Changing the transaction log level (SET LOG) is now written to the trace file by default.
@changelog_1341_li
@changelog_1346_li
#In a SQL script, primary key constraints are now ordered before foreign key constraints.
@changelog_1342_li
@changelog_1347_li
#It was not possible to create a referential constraint to a table in a different schema in some situations.
@changelog_1343_li
@changelog_1348_li
#The H2 Console was slow when the database contains many tables. Now the column names are not shown in this case.
@changelog_1344_h2
@changelog_1349_h2
#Version 1.0.66 (2008-02-02)
@changelog_1345_li
@changelog_1350_li
#There is a new online error analyzer tool.
@changelog_1346_li
@changelog_1351_li
#H2 Console: stack traces are now links to the source code in the source repository (H2 database only).
@changelog_1347_li
@changelog_1352_li
#CHAR data type equals comparison was case insensitive instead of case sensitive.
@changelog_1348_li
@changelog_1353_li
#The exception 'Value too long for column' now includes the data.
@changelog_1349_li
@changelog_1354_li
#The table name was missing in the documentation of CREATE INDEX.
@changelog_1350_li
@changelog_1355_li
#Better support for IKVM (www.ikvm.net): the H2 Console now opens a browser window.
@changelog_1351_li
@changelog_1356_li
#The cache size was not correctly calculated for tables with large objects (specially if compression is used). This could lead to out-of-memory exceptions.
@changelog_1352_li
@changelog_1357_li
#The exception "Hexadecimal string contains non-hex character" was not always thrown when it should have been. Fixed.
@changelog_1353_li
@changelog_1358_li
#The H2 Console now provides a link to the documentation when an error occurs (H2 databases only so far).
@changelog_1354_li
@changelog_1359_li
#The acting as PostgreSQL server, when a base directory was set, and the H2 Console was started as well, the base directory was applied twice.
@changelog_1355_li
@changelog_1360_li
#Calling EXTRACT(HOUR FROM ...) or EXTRACT(HH FROM ...) returned the wrong values (0 to 11 instead of 0 to 23). All other tested databases return values from 0 to 23. Please check if your application relies on the old behavior before upgrading.
@changelog_1356_li
@changelog_1361_li
#For compatibility with other databases the column default (COLUMN_DEF) for columns without default is now null (it was an empty string).
@changelog_1357_li
@changelog_1362_li
#Statements that contain very large subqueries (where the subquery result does not fit in memory) are now faster.
@changelog_1358_li
@changelog_1363_li
#Variables: large objects (CLOB and BLOB) that don't fit in memory did not work correctly when used as variables.
@changelog_1359_li
@changelog_1364_li
#Fulltext search is now supported in named in-memory databases.
@changelog_1360_li
@changelog_1365_li
#H2 Console: multiple consecutive spaces in the setting name did not work. Fixed.
