Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1003_li
SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1004_li
Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1005_li
Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1006_li
The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1007_li
The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1008_li
The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1009_li
Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1010_li
Commas at the end of INSERT ... VALUES (), (), are now supported.
The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1011_li
The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1012_li
When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1013_li
Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1014_li
UNIQUE was not listed as a keyword.
The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1015_li
Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1016_li
For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1017_li
The Shell tool will execute SQL statements passed as using the command line parameter -sql.
UNIQUE was not listed as a keyword.
@changelog_1018_li
If InetAddress.getLocalHost() fails, the database should now throw an exception.
Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1019_li
New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1020_li
The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1021_li
If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1022_li
New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1023_li
INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1021_h2
@changelog_1024_h2
Version 1.2.134 (2010-04-23)
@changelog_1022_li
@changelog_1025_li
New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1023_li
@changelog_1026_li
JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1024_li
@changelog_1027_li
MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1025_li
@changelog_1028_li
MERGE did not respect foreign key and check constraints.
@changelog_1026_li
@changelog_1029_li
ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1027_li
@changelog_1030_li
When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1028_li
@changelog_1031_li
Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1029_li
@changelog_1032_li
H2 Console: the built-in commands are now documented.
@changelog_1030_li
@changelog_1033_li
REPLACE: if any parameter is null, the result is null.
@changelog_1031_li
@changelog_1034_li
Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1032_li
@changelog_1035_li
The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1033_li
@changelog_1036_li
H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1034_li
@changelog_1037_li
The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1035_li
@changelog_1038_li
The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1036_li
@changelog_1039_li
Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1037_li
@changelog_1040_li
If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1038_h2
@changelog_1041_h2
Version 1.2.133 (2010-04-10)
@changelog_1039_li
@changelog_1042_li
A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1040_li
@changelog_1043_li
The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1041_li
@changelog_1044_li
The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1042_li
@changelog_1045_li
Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1043_li
@changelog_1046_li
The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1044_li
@changelog_1047_li
New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1045_li
@changelog_1048_li
ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1046_li
@changelog_1049_li
Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1047_li
@changelog_1050_li
Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1048_li
@changelog_1051_li
When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1049_li
@changelog_1052_li
Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1050_li
@changelog_1053_li
H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1051_li
@changelog_1054_li
H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1052_h2
@changelog_1055_h2
Version 1.2.132 (2010-03-21)
@changelog_1053_li
@changelog_1056_li
The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1054_li
@changelog_1057_li
User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1055_li
@changelog_1058_li
Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1056_li
@changelog_1059_li
When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1057_li
@changelog_1060_li
The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1058_li
@changelog_1061_li
Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1059_li
@changelog_1062_li
When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1060_li
@changelog_1063_li
The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1061_li
@changelog_1064_li
CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1062_li
@changelog_1065_li
Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1063_li
@changelog_1066_li
The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1064_li
@changelog_1067_li
When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1065_li
@changelog_1068_li
Literals of type BIGINT now have the correct data type.
@changelog_1066_h2
@changelog_1069_h2
Version 1.2.131 (2010-03-05)
@changelog_1067_li
@changelog_1070_li
Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1068_li
@changelog_1071_li
In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1069_li
@changelog_1072_li
After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1070_li
@changelog_1073_li
An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1071_h2
@changelog_1074_h2
Version 1.2.130 (2010-02-26)
@changelog_1072_li
@changelog_1075_li
EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1073_li
@changelog_1076_li
IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1074_li
@changelog_1077_li
IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1075_li
@changelog_1078_li
For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1076_li
@changelog_1079_li
PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1077_li
@changelog_1080_li
A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1078_li
@changelog_1081_li
When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1079_li
@changelog_1082_li
Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1080_li
@changelog_1083_li
The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1081_li
@changelog_1084_li
Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1082_li
@changelog_1085_li
Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1083_h2
@changelog_1086_h2
Version 1.2.129 (2010-02-19)
@changelog_1084_li
@changelog_1087_li
The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
@changelog_1085_li
@changelog_1088_li
CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1086_li
@changelog_1089_li
MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1087_li
@changelog_1090_li
Hash indexes now are only used for single column indexes.
@changelog_1088_li
@changelog_1091_li
The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
@changelog_1089_li
@changelog_1092_li
The file system abstraction no longer throws SQL exceptions.
@changelog_1090_li
@changelog_1093_li
DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1091_li
@changelog_1094_li
The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1092_li
@changelog_1095_li
SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1093_li
@changelog_1096_li
When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
@changelog_1094_li
@changelog_1097_li
The BNF parser now uses the visitor pattern.
@changelog_1095_li
@changelog_1098_li
Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1096_li
@changelog_1099_li
The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
@changelog_1097_li
@changelog_1100_li
H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1098_li
@changelog_1101_li
A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1099_li
@changelog_1102_li
The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1100_li
@changelog_1103_li
Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1101_li
@changelog_1104_li
Server.startWebServer(Connection) was not working as expected.
@changelog_1102_li
@changelog_1105_li
The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1103_li
@changelog_1106_li
The database URL option RECOVER has currently no effect.
@changelog_1104_li
@changelog_1107_li
Converting an old (non-page store) database is no longer supported using this version.
@changelog_1105_li
@changelog_1108_li
The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
@changelog_1106_li
@changelog_1109_li
The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1107_li
@changelog_1110_li
Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
@changelog_1108_li
@changelog_1111_li
The translated resources are now stored in UTF-8 format.
@changelog_1109_li
@changelog_1112_li
The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1110_h2
@changelog_1113_h2
Version 1.2.128 (2010-01-30)
@changelog_1111_li
@changelog_1114_li
There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
@changelog_1112_li
@changelog_1115_li
The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1113_li
@changelog_1116_li
Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1114_li
@changelog_1117_li
Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1115_li
@changelog_1118_li
If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
@changelog_1116_li
@changelog_1119_li
Less classes are loaded when using the database in embedded mode.
@changelog_1117_li
@changelog_1120_li
The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
@changelog_1118_li
@changelog_1121_li
Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
@changelog_1119_li
@changelog_1122_li
Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
@changelog_1120_li
@changelog_1123_li
Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1121_li
@changelog_1124_li
Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1122_li
@changelog_1125_li
MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
@changelog_1123_li
@changelog_1126_li
If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1124_li
@changelog_1127_li
Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1125_li
@changelog_1128_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1126_li
@changelog_1129_li
Slightly improved performance if the table is already locked.
@changelog_1127_li
@changelog_1130_li
CompressLZF: faster decompression.
@changelog_1128_li
@changelog_1131_li
PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1129_li
@changelog_1132_li
Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1130_h2
@changelog_1133_h2
Version 1.2.127 (2010-01-15)
@changelog_1131_li
@changelog_1134_li
Serialized access mode (server-less multi-connection mode): sequences did not work as expected (there were gaps in generated values when using multiple connections).
@changelog_1132_li
@changelog_1135_li
Page store: new databases can not be opened with older versions.
@changelog_1133_li
@changelog_1136_li
Page store: adding data to new database is now faster.
@changelog_1134_li
@changelog_1137_li
File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1135_li
@changelog_1138_li
PgServer: incorrect SQL types were returned in result set meta data. Concurrently opening a database could fail (PG catalog initialization was not synchronized). Thanks a lot to Sergi Vladykin for providing the patches!
@changelog_1136_li
@changelog_1139_li
SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1137_li
@changelog_1140_li
Page store: the wrong write count was written to the database header. This could cause the server-less multi-connection mode to fail.
@changelog_1138_li
@changelog_1141_li
Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1139_li
@changelog_1142_li
If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1140_li
@changelog_1143_li
Alter table is now supported even if a table has views defined.
@changelog_1141_li
@changelog_1144_li
Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1142_li
@changelog_1145_li
The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1143_li
@changelog_1146_li
Trigger can now be called on rollback.
@changelog_1144_li
@changelog_1147_li
The shell script h2.sh ignored command line line arguments.
@changelog_1145_li
@changelog_1148_li
When running H2 in the Google AppEngine for Java, a AccessControlException could be thrown when trying to open a read-only database. Fixed.
@changelog_1146_li
@changelog_1149_li
The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1147_li
@changelog_1150_li
Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1148_li
@changelog_1151_li
The .trace.db file is now only created if required.
@changelog_1149_li
@changelog_1152_li
Shell tool: improved PostgreSQL compatibility.
@changelog_1150_li
@changelog_1153_li
Trying to open a database in read-only mode when a .lock.db file exists will now fail with a nice error message.
@changelog_1151_li
@changelog_1154_li
H2 Console: data that is too long is now abbreviated as follows: text... (100000 characters). A large binary is abbreviated as follows: abcdef... (100000 bytes).
@changelog_1152_li
@changelog_1155_li
Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1153_li
@changelog_1156_li
Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1154_li
@changelog_1157_li
CompressLZF: Faster decompress and improved javadocs
@changelog_1155_h2
@changelog_1158_h2
Version 1.2.126 (2009-12-18)
@changelog_1156_li
@changelog_1159_li
The ChangeFileEncryption tool will now fail with an exception if the database is still in use. The Backup tool will also fail except when running in quiet mode.
@changelog_1157_li
@changelog_1160_li
CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1158_li
@changelog_1161_li
Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1159_li
@changelog_1162_li
Script command and tool: the primary key constraint is now listed before inserting the data. This will result in a smaller database when using the page store.
@changelog_1160_li
@changelog_1163_li
Statements with IN(SELECT..) conditions could produce the wrong result. Example: index on id, name; query: select * from test where id between 1 and 3 and name in (select 'World').
@changelog_1161_li
@changelog_1164_li
Statements with IN(..) conditions could produce the wrong result when using views or nested select statements. Example: index on id; index on name; query: select * from (select * from test) where id=1 and name in('a', 'b'). select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1162_li
@changelog_1165_li
Page store: a rollback of a relatively large transaction could fail with an ArrayIndexOutOfBoundsException or a 'row not found' exception in the PageBtreeIndex in some cases.
@changelog_1163_li
@changelog_1166_li
JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1164_li
@changelog_1167_li
LIKE: any letter is now allowed after the escape character (which is still '\' by default). Previously, an exception was thrown (unlike other databases) if it was not the escape character, '_' or '%'. If the escape character appears at the end of the pattern, the result is it is ignored (like PostgreSQL and MS SQL Server).
@changelog_1165_li
@changelog_1168_li
The reserve heap memory is no longer used.
@changelog_1166_li
@changelog_1169_li
Database.checkpoint() could throw a NullPointerException.
@changelog_1167_h2
@changelog_1170_h2
Version 1.2.125 (2009-12-06)
@changelog_1168_li
@changelog_1171_li
Lucene fulltext search: the Lucene field names now match the table column names, except if the column names start with _ (in which case another _ is prepended). Unfortunately this change means existing fulltext indexes need to be re-built.
@changelog_1169_li
@changelog_1172_li
The shell tool now has a very simple statement history.
@changelog_1170_li
@changelog_1173_li
The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1171_li
@changelog_1174_li
Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1172_li
@changelog_1175_li
Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1173_li
@changelog_1176_li
Trying to alter a temporary table threw a strange exception. It is still not possible to do that, but the exception message is better now.
@changelog_1174_li
@changelog_1177_li
When the system property h2.maxMemoryRowsDistinct was set, and using SELECT DISTINCT, the temporary table was not correctly dropped. This could cause problems in recovery when the process was killed.
@changelog_1175_li
@changelog_1178_li
Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1176_li
@changelog_1179_li
Non-row based triggers were called even if the action didn't match the declared action (INSERT triggers were also called when deleting rows). This has been changed. The MERGE statement calls both INSERT and DELETE triggers.
@changelog_1177_li
@changelog_1180_li
Statements with IN(..) conditions could produce the wrong result or a data conversion error (since version 1.2.120). Examples: index on id, name, condition: id=1 and name in('Hello', 'x'); index on id, query: select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1178_li
@changelog_1181_li
The CompressTool was not multithreading safe. Because of this, the following database operations where also not multithreading safe (even when using different databases): the SCRIPT command (only when using compression), the COMPRESS function, and storing CLOB or BLOB data (only when compression is enabled).
@changelog_1179_li
@changelog_1182_li
The compression algorithm "LZF" is now about 33% faster than before when compressing small block (around 2 KB). It is much faster than Deflate, but the compression ratio is lower. Some of the optimizations are from Sam Van Oort, thanks a lot!
@changelog_1180_li
@changelog_1183_li
Compressing large blocks of data didn't work when using the "Deflate" compression algorithm. Compressing a lot of data could run out of heap memory.
@changelog_1181_li
@changelog_1184_li
The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1182_li
@changelog_1185_li
More bugs in the server-less multi-connection mode have been fixed.
@changelog_1183_li
@changelog_1186_li
When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1184_li
@changelog_1187_li
JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1185_li
@changelog_1188_li
User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1186_li
@changelog_1189_li
User defined functions with source code didn't work after re-opening the database.
@changelog_1187_li
@changelog_1190_li
The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1188_li
@changelog_1191_li
The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1189_li
@changelog_1192_li
Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1190_li
@changelog_1193_li
Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1191_h2
@changelog_1194_h2
Version 1.2.124 (2009-11-20)
@changelog_1192_li
@changelog_1195_li
Clustering: there is now a way to detect which cluster instances are running.
@changelog_1193_li
@changelog_1196_li
ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1194_li
@changelog_1197_li
The file lock thread is now stopped when the database is closed.
@changelog_1195_li
@changelog_1198_li
Issue 140: the Script tool now supports writing to a stream.
@changelog_1196_li
@changelog_1199_li
Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1197_li
@changelog_1200_li
Page store: new databases can not be opened with older versions.
@changelog_1198_li
@changelog_1201_li
Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1199_li
@changelog_1202_li
Page store: opening a database could theoretically result in an endless loop.
@changelog_1200_li
@changelog_1203_li
Page store: adding large indexed columns could get very slow.
@changelog_1201_li
@changelog_1204_li
Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1202_li
@changelog_1205_li
Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1203_li
@changelog_1206_li
Page store: sometimes opening a read-only database failed.
@changelog_1204_li
@changelog_1207_li
Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1205_li
@changelog_1208_li
Page store: when using a very small page size (128 bytes or smaller), writing a large row could result in an endless recursion. This is only a theoretical problem, as the page size is 2 KB.
@changelog_1206_li
@changelog_1209_li
Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1207_li
@changelog_1210_li
Page store: improved auto-recovery after power failure.
@changelog_1208_li
@changelog_1211_li
The JDBC client did not detect that it was not talking to an H2 server. This could result in strange exceptions when trying to connect to another kind of server.
@changelog_1209_li
@changelog_1212_li
User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1210_li
@changelog_1213_li
Database file lock: the exception "lock file modified in the future" is no longer thrown; instead, opening the file will be delayed by 2 seconds.
@changelog_1211_li
@changelog_1214_li
Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1212_li
@changelog_1215_li
Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1213_li
@changelog_1216_li
Improved read-only database detection.
@changelog_1214_h2
@changelog_1217_h2
Version 1.2.123 (2009-11-08)
@changelog_1215_li
@changelog_1218_li
Page store: new databases can not be opened with older versions.
@changelog_1216_li
@changelog_1219_li
Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1217_li
@changelog_1220_li
Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1218_li
@changelog_1221_li
When using multi-threaded kernel mode, setting disabling locking (LOCK_MODE=0) will now throw an exception. At this time this combination will result in corruption when multiple threads try to update the same table.
@changelog_1219_li
@changelog_1222_li
The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1220_li
@changelog_1223_li
The Lucene fulltext search now also returns the score.
@changelog_1221_li
@changelog_1224_li
New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1222_li
@changelog_1225_li
Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1223_li
@changelog_1226_li
Improved error messages: identifiers and values are now quoted.
@changelog_1224_li
@changelog_1227_li
Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1225_li
@changelog_1228_li
Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1226_h2
@changelog_1229_h2
Version 1.2.122 (2009-10-28)
@changelog_1227_li
@changelog_1230_li
The native fulltext search now supports streaming CLOB data.
@changelog_1228_li
@changelog_1231_li
If the database URL ends with ;PAGE_STORE=TRUE and a database in the old format exists, it is automatically converted to the new page store format if possible. A backup of the database is created first. Automatic conversion is not supported if the database was not closed normally (if it contains uncommitted transactions).
@changelog_1229_li
@changelog_1232_li
Dropping the current user is now allowed if another admin user exists.
@changelog_1230_li
@changelog_1233_li
Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1231_li
@changelog_1234_li
SHUTDOWN COMPACT now fully compacts the database.
@changelog_1232_li
@changelog_1235_li
New system properties h2.maxCompactCount and h2.maxCompactTime to allow changing the default behavior (at most 2 seconds compacting when closing the database).
@changelog_1233_li
@changelog_1236_li
New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1234_li
@changelog_1237_li
Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1235_li
@changelog_1238_li
Page store: opening a large database was slow if it was not closed before.
@changelog_1236_li
@changelog_1239_li
Page store: new write and read counters in the meta data table. Use SELECT * FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME IN( 'info.FILE_WRITE_TOTAL', 'info.FILE_WRITE', 'info.FILE_READ', 'info.CACHE_MAX_SIZE', 'info.CACHE_SIZE')
@changelog_1237_li
@changelog_1240_li
The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1238_li
@changelog_1241_li
The documentation is no longer available in Japanese because the translation was too much out of sync. Please use the Google translation instead.
@changelog_1239_li
@changelog_1242_li
Certain queries were not sorted if subselect queries were involved
@changelog_1240_li
@changelog_1243_li
More bugs in the server-less multi-connection mode have been fixed: 90097 The database is read only, caches must be cleared on reconnect, etc.
@changelog_1241_h2
@changelog_1244_h2
Version 1.2.121 (2009-10-11)
@changelog_1242_li
@changelog_1245_li
Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1243_li
@changelog_1246_li
CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1244_li
@changelog_1247_li
If a database in the old format exists, it is now used. The system property is used for new databases, or if databases exist in both formats. In any case, the flag in the URL overrides this logic.
@changelog_1245_li
@changelog_1248_li
Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1246_li
@changelog_1249_li
The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1247_li
@changelog_1250_li
New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1248_h2
@changelog_1251_h2
Version 1.2.120 (2009-10-04)
@changelog_1249_li
@changelog_1252_li
This is a beta version.
@changelog_1250_li
@changelog_1253_li
Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1251_li
@changelog_1254_li
In version 1.2, the following system properties are now enabled by default: h2.pageStore, h2.nullConcatIsNull, h2.optimizeInList. The default value for h2.defaultMaxLengthInplaceLob is now 4096 (it was 1024 with version 1.1).
@changelog_1252_li
@changelog_1255_li
New databases are now stored in the new 'page store' file format. Existing databases are kept in the old file format. To use the old file format, append ;PAGE_STORE=FALSE to the database URL or set the system property h2.pageStore to false.
@changelog_1253_li
@changelog_1256_li
Issue 125: Renaming primary keys was not persistent. Fixed. Unfortunately, databases created by this version can not be opened with older versions because of this change.
@changelog_1254_li
@changelog_1257_li
Issue 124: Hibernate schema validation failed for decimal/numeric columns. This problem is fixed in the Hibernate dialect that is included with H2 (src/tools/org/hibernate/dialect/H2Dialect.java.txt), but not in Hibernate yet.
@changelog_1255_li
@changelog_1258_li
PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1256_li
@changelog_1259_li
Linked tables now support default values when inserting, updating or merging.
@changelog_1257_li
@changelog_1260_li
Bugfixes in the page store.
@changelog_1258_li
@changelog_1261_li
Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1259_li
@changelog_1262_li
Allow writing to linked tables in readonly databases.
@changelog_1260_h2
@changelog_1263_h2
Version 1.1.119 (2009-09-26)
@changelog_1261_li
@changelog_1264_li
SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1262_li
@changelog_1265_li
Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1263_li
@changelog_1266_li
New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1264_li
@changelog_1267_li
New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1265_li
@changelog_1268_li
The cache algorithm TQ is disabled in this version, because it is unstable, and because the current implementation does not have any measurable advantages over the default.
@changelog_1266_li
@changelog_1269_li
New committer: Christian Peter. He works for <a href="http://www.docware.com">Docware</a> and helped a lot finding and fixing bugs, and generally improving the database. He is now a committer.
@changelog_1267_li
@changelog_1270_li
ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1268_li
@changelog_1271_li
Issue 121: JaQu: new simple update and merge methods.
@changelog_1269_li
@changelog_1272_li
Issue 120: JaQu didn't close result sets.
@changelog_1270_li
@changelog_1273_li
Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1271_li
@changelog_1274_li
The new page store mechanism is now alpha-level quality. The next release will most likely be "1.2.120 beta" where this mode is enabled by default. To use it right now, append ;PAGE_STORE=TRUE to the database URL. The file format of this mode will probably not change any more.
@changelog_1272_li
@changelog_1275_li
SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1273_li
@changelog_1276_li
The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1274_li
@changelog_1277_li
New sample application that shows how to pass data to a trigger.
@changelog_1275_li
@changelog_1278_li
More bugs in the server-less multi-connection mode have been fixed: On Windows, two processes could write to the same database at the same time.
@changelog_1276_li
@changelog_1279_li
When loading triggers or other client classes (static functions, database event listener, user aggregate functions, other JDBC drivers), the database now uses the context class loader if the class could not be found using Class.forName().
@changelog_1277_li
@changelog_1280_li
Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1278_li
@changelog_1281_li
Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1279_li
@changelog_1282_li
The native fulltext index kept a reference to a database after the database was closed.
@changelog_1280_li
@changelog_1283_li
Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1281_li
@changelog_1284_li
The optimizer does a better job for joins if indexes are missing.
@changelog_1282_h2
@changelog_1285_h2
Version 1.1.118 (2009-09-04)
@changelog_1283_li
@changelog_1286_li
SHOW COLUMNS only listed indexed columns.
@changelog_1284_li
@changelog_1287_li
When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1285_li
@changelog_1288_li
DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1286_li
@changelog_1289_li
AUTO_INCREMENT now works in the same way in ALTER TABLE ALTER COLUMN as in CREATE TABLE (it does not create a primary key).
@changelog_1287_li
@changelog_1290_li
Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1288_li
@changelog_1291_li
Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1289_li
@changelog_1292_li
JaQu: the plan is to support natural (pure Java / Scala) conditions such as (id == 1 && name.equals("Test")). A proof of concept decompiler is now included (it doesn't work yet).
@changelog_1290_li
@changelog_1293_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1291_li
@changelog_1294_li
PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1292_li
@changelog_1295_li
H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1293_li
@changelog_1296_li
Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1294_li
@changelog_1297_li
H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1295_li
@changelog_1298_li
Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1296_li
@changelog_1299_li
Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1297_li
@changelog_1300_li
Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1298_li
@changelog_1301_li
Issue 101: The following sequence could throw the exception "Row not found when trying to delete": start a transaction, insert many rows, delete many rows, rollback. The number of rows depends on the cache size.
@changelog_1299_li
@changelog_1302_li
The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1300_li
@changelog_1303_li
An optimization for OR is implemented, but disabled by default. Expressions of the type X=1 OR X=2 are converted to X IN(1, 2). To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver.
@changelog_1301_li
@changelog_1304_li
An optimization for IN(..) and IN(SELECT...) is implemented, but disabled by default. To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver. If enabled, this overrides h2.optimizeIn and h2.optimizeInJoin. Unlike now, this optimization will also speed up updates and deletes.
@changelog_1302_h2
@changelog_1305_h2
Version 1.1.117 (2009-08-09)
@changelog_1303_li
@changelog_1306_li
New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1304_li
@changelog_1307_li
JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1305_li
@changelog_1308_li
Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1306_li
@changelog_1309_li
LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1307_li
@changelog_1310_li
Views using functions were not re-evaluated when necessary.
@changelog_1308_li
@changelog_1311_li
Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1309_li
@changelog_1312_li
Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1310_li
@changelog_1313_li
Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1311_li
@changelog_1314_li
Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1312_li
@changelog_1315_li
Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1313_li
@changelog_1316_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1314_li
@changelog_1317_li
The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1315_li
@changelog_1318_li
Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1316_li
@changelog_1319_li
Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1317_li
@changelog_1320_li
Parsing SQL script files is now faster.
@changelog_1318_li
@changelog_1321_li
CSV reading is now faster.
@changelog_1319_li
@changelog_1322_li
SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1320_h2
@changelog_1323_h2
Version 1.1.116 (2009-07-18)
@changelog_1321_li
@changelog_1324_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1322_li
@changelog_1325_li
The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1323_li
@changelog_1326_li
H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1324_li
@changelog_1327_li
ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1325_li
@changelog_1328_li
Creating indexes is now a bit faster.
@changelog_1326_li
@changelog_1329_li
PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1327_li
@changelog_1330_li
PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1328_li
@changelog_1331_li
H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1329_li
@changelog_1332_li
Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1330_li
@changelog_1333_li
New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1331_li
@changelog_1334_li
JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1332_li
@changelog_1335_li
If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1333_li
@changelog_1336_li
Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1334_li
@changelog_1337_li
The Recover tool did not work with .data.db files of the wrong size.
@changelog_1335_li
@changelog_1338_li
Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1336_li
@changelog_1339_li
The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1337_li
@changelog_1340_li
To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1338_h2
@changelog_1341_h2
Version 1.1.115 (2009-06-21)
@changelog_1339_li
@changelog_1342_li
The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1340_li
@changelog_1343_li
ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1341_li
@changelog_1344_li
Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1342_li
@changelog_1345_li
java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1343_li
@changelog_1346_li
H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1344_li
@changelog_1347_li
H2 Console: improved Polish translation.
@changelog_1345_li
@changelog_1348_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1346_li
@changelog_1349_li
The download page now included the SHA1 checksums.
@changelog_1347_li
@changelog_1350_li
Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1348_li
@changelog_1351_li
The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1349_li
@changelog_1352_li
Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1350_li
@changelog_1353_li
Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1351_li
@changelog_1354_li
Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1352_li
@changelog_1355_li
Data types: LONG is now an alias for BIGINT.
@changelog_1353_h2
@changelog_1356_h2
Version 1.1.114 (2009-06-01)
@changelog_1354_li
@changelog_1357_li
ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1355_li
@changelog_1358_li
Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1356_li
@changelog_1359_li
In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1357_li
@changelog_1360_li
Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1358_li
@changelog_1361_li
The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1359_li
@changelog_1362_li
Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@cheatSheet_1000_h1
...
...
@@ -4625,7 +4634,7 @@ Passing the User Name and/or Password in the URL
User-Defined Functions and Stored Procedures
@features_1568_p
In addition to the built-in functions, this database supports user-defined Java functions. In this database, Java functions can be used as stored procedures as well. A function must be declared (registered) before it can be used. A functions can be defined using source code, or as a reference to a compiled class that is available in the classpath.
In addition to the built-in functions, this database supports user-defined Java functions. In this database, Java functions can be used as stored procedures as well. A function must be declared (registered) before it can be used. A function can be defined using source code, or as a reference to a compiled class that is available in the classpath. By default, the function aliases are stored in the current schema.
@features_1569_h3
Referencing a Compiled Method
...
...
@@ -8272,671 +8281,671 @@ Lob storage: enable the system property h2.lobInDatabase by default.
@roadmap_1004_li
Automatic ANALYZE: set the system property h2.analyzeAuto to 2000.
@roadmap_1005_h2
@roadmap_1005_li
Enable h2.functionsInSchema.
@roadmap_1006_h2
Priority 1
@roadmap_1006_li
@roadmap_1007_li
Bugfixes
@roadmap_1007_li
@roadmap_1008_li
Support very large transactions. Reduce memory usage of undo log.
@roadmap_1008_li
@roadmap_1009_li
More tests with MULTI_THREADED=1
@roadmap_1009_li
@roadmap_1010_li
Optimization: result set caching (like MySQL); option to disable
@roadmap_1010_li
@roadmap_1011_li
Server side cursors
@roadmap_1011_h2
@roadmap_1012_h2
Priority 2
@roadmap_1012_li
@roadmap_1013_li
Improve test code coverage.
@roadmap_1013_li
@roadmap_1014_li
Test multi-threaded in-memory db access
@roadmap_1014_li
@roadmap_1015_li
MVCC: select for update should only lock the selected rows.
@roadmap_1015_li
@roadmap_1016_li
Option to shutdown all the running servers (on the same VM).
@roadmap_1016_li
@roadmap_1017_li
Full outer joins.
@roadmap_1017_li
@roadmap_1018_li
Support nested outer joins (see todo.txt).
@roadmap_1018_li
@roadmap_1019_li
Clustering: recovery needs to becomes fully automatic. Global write lock feature.
@roadmap_1019_li
@roadmap_1020_li
Clustering: support mixed clustering mode (one embedded, others in server mode).
@roadmap_1020_li
@roadmap_1021_li
Clustering: reads should be randomly distributed (optional) or to a designated database on RAM (parameter: READ_FROM=3).
@roadmap_1021_li
@roadmap_1022_li
PostgreSQL catalog: use BEFORE SELECT triggers instead of views over metadata tables.
@roadmap_1022_li
@roadmap_1023_li
Test very large databases and LOBs (up to 256 GB).
@roadmap_1023_li
@roadmap_1024_li
Support hints for the optimizer (which index to use, enforce the join order).
@roadmap_1024_li
@roadmap_1025_li
Sequence: add features [NO] MINVALUE, MAXVALUE, CYCLE.
Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files.
@roadmap_1064_li
@roadmap_1065_li
iReport to support H2.
@roadmap_1065_li
@roadmap_1066_li
Implement missing JDBC API (CallableStatement,...).
@roadmap_1066_li
@roadmap_1067_li
Compression of the cache.
@roadmap_1067_li
@roadmap_1068_li
Include SMPT (mail) client (alert on cluster failure, low disk space,...).
@roadmap_1068_li
@roadmap_1069_li
Drop with restrict (currently cascade is the default).
@roadmap_1069_li
@roadmap_1070_li
JSON parser and functions.
@roadmap_1070_li
@roadmap_1071_li
Server: client ping from time to time (to avoid timeout - is timeout a problem?).
@roadmap_1071_li
@roadmap_1072_li
Copy database: tool with config GUI and batch mode, extensible (example: compare).
@roadmap_1072_li
@roadmap_1073_li
Document, implement tool for long running transactions using user-defined compensation statements.
@roadmap_1073_li
@roadmap_1074_li
Support SET TABLE DUAL READONLY.
@roadmap_1074_li
@roadmap_1075_li
GCJ: what is the state now?
@roadmap_1075_li
Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server. See http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html
@roadmap_1076_li
Optimization: log compression.
Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server. See http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html
@roadmap_1077_li
ROW_NUMBER() OVER([ORDER BY columnName]).
Optimization: log compression.
@roadmap_1078_li
Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt - specially KEY_COLUMN_USAGE: http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif
ROW_NUMBER() OVER([ORDER BY columnName]).
@roadmap_1079_li
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero.
Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt - specially KEY_COLUMN_USAGE: http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif
@roadmap_1080_li
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R).
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero.
@roadmap_1081_li
Custom class loader to reload functions on demand.
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R).
@roadmap_1082_li
Clustering: when a database is back alive, automatically synchronize with the master.
Custom class loader to reload functions on demand.
@roadmap_1083_li
Test http://mysql-je.sourceforge.net/
Clustering: when a database is back alive, automatically synchronize with the master.
@roadmap_1084_li
EXE file: maybe use http://jsmooth.sourceforge.net
Test http://mysql-je.sourceforge.net/
@roadmap_1085_li
Performance: automatically build in-memory indexes if the whole table is in memory.
EXE file: maybe use http://jsmooth.sourceforge.net
@roadmap_1086_li
H2 Console: the webclient could support more features like phpMyAdmin.
Performance: automatically build in-memory indexes if the whole table is in memory.
@roadmap_1087_li
Use Janino to convert Java to C++.
H2 Console: the webclient could support more features like phpMyAdmin.
@roadmap_1088_li
The HELP information schema can be directly exposed in the Console.
Use Janino to convert Java to C++.
@roadmap_1089_li
Maybe use the 0x1234 notation for binary fields, see MS SQL Server.
The HELP information schema can be directly exposed in the Console.
@roadmap_1090_li
Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html http://philip.greenspun.com/sql/trees.html
Maybe use the 0x1234 notation for binary fields, see MS SQL Server.
@roadmap_1091_li
SQL Server 2005, Oracle: support COUNT(*) OVER(). See http://www.orafusion.com/art_anlytc.htm
Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html http://philip.greenspun.com/sql/trees.html
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
Option to encrypt .trace.db file.
@roadmap_1113_li
Functions with unknown return or parameter data types: serialize / deserialize.
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@roadmap_1114_li
Test if idle TCP connections are closed, and how to disable that.
Functions with unknown return or parameter data types: serialize / deserialize.
@roadmap_1115_li
Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
Test if idle TCP connections are closed, and how to disable that.
@roadmap_1116_li
Auto-Update feature for database, .jar file.
Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
@roadmap_1117_li
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
Auto-Update feature for database, .jar file.
@roadmap_1118_li
Partial indexing (see PostgreSQL).
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
@roadmap_1119_li
Add GUI to build a custom version (embedded, fulltext,...) using build flags.
Partial indexing (see PostgreSQL).
@roadmap_1120_li
http://rubyforge.org/projects/hypersonic/
Add GUI to build a custom version (embedded, fulltext,...) using build flags.
@roadmap_1121_li
Add comparator (x === y) : (x = y or (x is null and y is null)).
http://rubyforge.org/projects/hypersonic/
@roadmap_1122_li
Try to create trace file even for read only databases.
Add comparator (x === y) : (x = y or (x is null and y is null)).
@roadmap_1123_li
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
Try to create trace file even for read only databases.
@roadmap_1124_li
Count on a column that can not be null could be optimized to COUNT(*).
Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
@roadmap_1125_li
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
Count on a column that can not be null could be optimized to COUNT(*).
@roadmap_1126_li
Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
@roadmap_1127_li
Backup tool should work with other databases as well.
Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
@roadmap_1128_li
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
Backup tool should work with other databases as well.
@roadmap_1129_li
Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess).
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
Implement Clob / Blob truncate and the remaining functionality.
Compatibility for CREATE SCHEMA AUTHORIZATION.
@roadmap_1134_li
Tree join functionality.
Implement Clob / Blob truncate and the remaining functionality.
@roadmap_1135_li
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
Tree join functionality.
@roadmap_1136_li
Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
@roadmap_1137_li
Pure SQL triggers (example: update parent table if the child table is changed).
Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1138_li
Add H2 to Gem (Ruby install system).
Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1139_li
API for functions / user tables.
Add H2 to Gem (Ruby install system).
@roadmap_1140_li
Order conditions inside AND / OR to optimize the performance.
API for functions / user tables.
@roadmap_1141_li
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER.
Order conditions inside AND / OR to optimize the performance.
@roadmap_1142_li
Support linked JCR tables
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER.
@roadmap_1143_li
Make sure H2 is supported by Execute Query: http://executequery.org/
Support linked JCR tables
@roadmap_1144_li
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1145_li
Native fulltext search: min word length; store word positions
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1146_li
Add an option to the SCRIPT command to generate only portable / standard SQL
Native fulltext search: min word length; store word positions
@roadmap_1147_li
Test Dezign for Databases: http://www.datanamic.com
Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1148_li
Fast library for parsing / formatting: http://javolution.org/
Test Dezign for Databases: http://www.datanamic.com
@roadmap_1149_li
Updatable Views (simple cases first)
Fast library for parsing / formatting: http://javolution.org/
@roadmap_1150_li
Improve create index performance
Updatable Views (simple cases first)
@roadmap_1151_li
Implement more JDBC 4.0 features
Improve create index performance
@roadmap_1152_li
Support TRANSFORM / PIVOT as in MS Access
Implement more JDBC 4.0 features
@roadmap_1153_li
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
Support TRANSFORM / PIVOT as in MS Access
@roadmap_1154_li
Support updatable views with join on primary keys (to extend a table)
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1155_li
Public interface for functions (not public static)
Support updatable views with join on primary keys (to extend a table)
@roadmap_1156_li
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
Public interface for functions (not public static)
@roadmap_1157_li
Support reading the transaction log.
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1158_li
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
Support reading the transaction log.
@roadmap_1159_li
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1160_li
Updatable result set on table without primary key or unique index
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1161_li
Use LinkedList instead of ArrayList where applicable
Updatable result set on table without primary key or unique index
@roadmap_1162_li
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
Use LinkedList instead of ArrayList where applicable
@roadmap_1163_li
Support % operator (modulo)
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1164_li
Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
Support % operator (modulo)
@roadmap_1165_li
Support nested transactions
Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
@roadmap_1166_li
Add a benchmark for big databases, and one for many users
Support nested transactions
@roadmap_1167_li
Compression in the result set (repeating values in the same column) over TCP/IP
Add a benchmark for big databases, and one for many users
@roadmap_1168_li
Support curtimestamp (like curtime, curdate)
Compression in the result set (repeating values in the same column) over TCP/IP
@roadmap_1169_li
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
Support curtimestamp (like curtime, curdate)
@roadmap_1170_li
Support Sequoia (Continuent.org)
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
@roadmap_1171_li
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
Support Sequoia (Continuent.org)
@roadmap_1172_li
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
@roadmap_1173_li
Release locks (shared or exclusive) on demand
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
@roadmap_1174_li
Support OUTER UNION
Release locks (shared or exclusive) on demand
@roadmap_1175_li
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
Support OUTER UNION
@roadmap_1176_li
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
@roadmap_1177_li
Option for SCRIPT to only process one or a set of tables, and append to a file
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
@roadmap_1178_li
Support linked tables to the current database
Option for SCRIPT to only process one or a set of tables, and append to a file
@roadmap_1179_li
Support dynamic linked schema (automatically adding/updating/removing tables)
Support linked tables to the current database
@roadmap_1180_li
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
Support dynamic linked schema (automatically adding/updating/removing tables)
@roadmap_1181_li
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@roadmap_1182_li
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@roadmap_1183_li
Run benchmarks with JDK 1.5, JDK 1.6, java -server
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@roadmap_1184_li
Optimizations: faster hash function for strings, byte arrays
Run benchmarks with JDK 1.5, JDK 1.6, java -server
@roadmap_1185_li
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
Optimizations: faster hash function for strings, byte arrays
@roadmap_1186_li
Benchmark: add a graph to show how databases scale (performance/database size)
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@roadmap_1187_li
Implement a SQLData interface to map your data over to a custom object
Benchmark: add a graph to show how databases scale (performance/database size)
@roadmap_1188_li
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
Implement a SQLData interface to map your data over to a custom object
@roadmap_1189_li
Support multiple directories (on different hard drives) for the same database
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@roadmap_1190_li
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
Support multiple directories (on different hard drives) for the same database
@roadmap_1191_li
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@roadmap_1192_li
Support native XML data type
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@roadmap_1193_li
Support triggers with a string property or option: SpringTrigger, OSGITrigger
Support native XML data type
@roadmap_1194_li
Ability to resize the cache array when resizing the cache
Support triggers with a string property or option: SpringTrigger, OSGITrigger
@roadmap_1195_li
Time based cache writing (one second after writing the log)
Ability to resize the cache array when resizing the cache
@roadmap_1196_li
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
Time based cache writing (one second after writing the log)
@roadmap_1197_li
Index usage for REGEXP LIKE.
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
@roadmap_1198_li
Compatibility: add a role DBA (like ADMIN).
Index usage for REGEXP LIKE.
@roadmap_1199_li
Better support multiple processors for in-memory databases.
Compatibility: add a role DBA (like ADMIN).
@roadmap_1200_li
Support N'text'
Better support multiple processors for in-memory databases.
@roadmap_1201_li
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
Support N'text'
@roadmap_1202_li
Support compatibility for jdbc:hsqldb:res:
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@roadmap_1203_li
Provide an Java SQL builder with standard and H2 syntax
Support compatibility for jdbc:hsqldb:res:
@roadmap_1204_li
Trace: write OS, file system, JVM,... when opening the database
Provide an Java SQL builder with standard and H2 syntax
@roadmap_1205_li
Support indexes for views (probably requires materialized views)
Trace: write OS, file system, JVM,... when opening the database
@roadmap_1206_li
Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
Support indexes for views (probably requires materialized views)
@roadmap_1207_li
Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
@roadmap_1208_li
Server: use one listener (detect if the request comes from an PG or TCP client)
Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
@roadmap_1209_li
Support data type INTERVAL
Server: use one listener (detect if the request comes from an PG or TCP client)
@roadmap_1210_li
Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
#Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
#New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1003_li
#SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
#Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1004_li
#Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
#Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1005_li
#Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
#Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1006_li
#The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
#SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1007_li
#The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
#Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1008_li
#The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
#Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1009_li
#Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
#The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1010_li
#Commas at the end of INSERT ... VALUES (), (), are now supported.
#The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1011_li
#The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
#The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1012_li
#When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
#Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1013_li
#Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
#Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1014_li
#UNIQUE was not listed as a keyword.
#The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1015_li
#Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
#When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1016_li
#For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
#Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1017_li
#The Shell tool will execute SQL statements passed as using the command line parameter -sql.
#UNIQUE was not listed as a keyword.
@changelog_1018_li
#If InetAddress.getLocalHost() fails, the database should now throw an exception.
#Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1019_li
#New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
#For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1020_li
#The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1021_li
#If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1022_li
#New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1023_li
#INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1021_h2
@changelog_1024_h2
#Version 1.2.134 (2010-04-23)
@changelog_1022_li
@changelog_1025_li
#New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1023_li
@changelog_1026_li
#JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1024_li
@changelog_1027_li
#MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1025_li
@changelog_1028_li
#MERGE did not respect foreign key and check constraints.
@changelog_1026_li
@changelog_1029_li
#ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1027_li
@changelog_1030_li
#When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1028_li
@changelog_1031_li
#Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1029_li
@changelog_1032_li
#H2 Console: the built-in commands are now documented.
@changelog_1030_li
@changelog_1033_li
#REPLACE: if any parameter is null, the result is null.
@changelog_1031_li
@changelog_1034_li
#Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1032_li
@changelog_1035_li
#The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1033_li
@changelog_1036_li
#H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1034_li
@changelog_1037_li
#The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1035_li
@changelog_1038_li
#The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1036_li
@changelog_1039_li
#Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1037_li
@changelog_1040_li
#If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1038_h2
@changelog_1041_h2
#Version 1.2.133 (2010-04-10)
@changelog_1039_li
@changelog_1042_li
#A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1040_li
@changelog_1043_li
#The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1041_li
@changelog_1044_li
#The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1042_li
@changelog_1045_li
#Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1043_li
@changelog_1046_li
#The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1044_li
@changelog_1047_li
#New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1045_li
@changelog_1048_li
#ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1046_li
@changelog_1049_li
#Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1047_li
@changelog_1050_li
#Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1048_li
@changelog_1051_li
#When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1049_li
@changelog_1052_li
#Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1050_li
@changelog_1053_li
#H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1051_li
@changelog_1054_li
#H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1052_h2
@changelog_1055_h2
#Version 1.2.132 (2010-03-21)
@changelog_1053_li
@changelog_1056_li
#The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1054_li
@changelog_1057_li
#User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1055_li
@changelog_1058_li
#Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1056_li
@changelog_1059_li
#When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1057_li
@changelog_1060_li
#The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1058_li
@changelog_1061_li
#Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1059_li
@changelog_1062_li
#When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1060_li
@changelog_1063_li
#The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1061_li
@changelog_1064_li
#CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1062_li
@changelog_1065_li
#Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1063_li
@changelog_1066_li
#The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1064_li
@changelog_1067_li
#When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1065_li
@changelog_1068_li
#Literals of type BIGINT now have the correct data type.
@changelog_1066_h2
@changelog_1069_h2
#Version 1.2.131 (2010-03-05)
@changelog_1067_li
@changelog_1070_li
#Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1068_li
@changelog_1071_li
#In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1069_li
@changelog_1072_li
#After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1070_li
@changelog_1073_li
#An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1071_h2
@changelog_1074_h2
#Version 1.2.130 (2010-02-26)
@changelog_1072_li
@changelog_1075_li
#EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1073_li
@changelog_1076_li
#IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1074_li
@changelog_1077_li
#IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1075_li
@changelog_1078_li
#For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1076_li
@changelog_1079_li
#PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1077_li
@changelog_1080_li
#A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1078_li
@changelog_1081_li
#When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1079_li
@changelog_1082_li
#Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1080_li
@changelog_1083_li
#The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1081_li
@changelog_1084_li
#Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1082_li
@changelog_1085_li
#Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1083_h2
@changelog_1086_h2
#Version 1.2.129 (2010-02-19)
@changelog_1084_li
@changelog_1087_li
#The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
@changelog_1085_li
@changelog_1088_li
#CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1086_li
@changelog_1089_li
#MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1087_li
@changelog_1090_li
#Hash indexes now are only used for single column indexes.
@changelog_1088_li
@changelog_1091_li
#The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
@changelog_1089_li
@changelog_1092_li
#The file system abstraction no longer throws SQL exceptions.
@changelog_1090_li
@changelog_1093_li
#DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1091_li
@changelog_1094_li
#The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1092_li
@changelog_1095_li
#SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1093_li
@changelog_1096_li
#When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
@changelog_1094_li
@changelog_1097_li
#The BNF parser now uses the visitor pattern.
@changelog_1095_li
@changelog_1098_li
#Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1096_li
@changelog_1099_li
#The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
@changelog_1097_li
@changelog_1100_li
#H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1098_li
@changelog_1101_li
#A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1099_li
@changelog_1102_li
#The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1100_li
@changelog_1103_li
#Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1101_li
@changelog_1104_li
#Server.startWebServer(Connection) was not working as expected.
@changelog_1102_li
@changelog_1105_li
#The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1103_li
@changelog_1106_li
#The database URL option RECOVER has currently no effect.
@changelog_1104_li
@changelog_1107_li
#Converting an old (non-page store) database is no longer supported using this version.
@changelog_1105_li
@changelog_1108_li
#The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
@changelog_1106_li
@changelog_1109_li
#The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1107_li
@changelog_1110_li
#Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
@changelog_1108_li
@changelog_1111_li
#The translated resources are now stored in UTF-8 format.
@changelog_1109_li
@changelog_1112_li
#The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1110_h2
@changelog_1113_h2
#Version 1.2.128 (2010-01-30)
@changelog_1111_li
@changelog_1114_li
#There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
@changelog_1112_li
@changelog_1115_li
#The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1113_li
@changelog_1116_li
#Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1114_li
@changelog_1117_li
#Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1115_li
@changelog_1118_li
#If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
@changelog_1116_li
@changelog_1119_li
#Less classes are loaded when using the database in embedded mode.
@changelog_1117_li
@changelog_1120_li
#The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
@changelog_1118_li
@changelog_1121_li
#Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
@changelog_1119_li
@changelog_1122_li
#Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
@changelog_1120_li
@changelog_1123_li
#Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1121_li
@changelog_1124_li
#Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1122_li
@changelog_1125_li
#MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
@changelog_1123_li
@changelog_1126_li
#If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1124_li
@changelog_1127_li
#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1125_li
@changelog_1128_li
#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1126_li
@changelog_1129_li
#Slightly improved performance if the table is already locked.
@changelog_1127_li
@changelog_1130_li
#CompressLZF: faster decompression.
@changelog_1128_li
@changelog_1131_li
#PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1129_li
@changelog_1132_li
#Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1130_h2
@changelog_1133_h2
#Version 1.2.127 (2010-01-15)
@changelog_1131_li
@changelog_1134_li
#Serialized access mode (server-less multi-connection mode): sequences did not work as expected (there were gaps in generated values when using multiple connections).
@changelog_1132_li
@changelog_1135_li
#Page store: new databases can not be opened with older versions.
@changelog_1133_li
@changelog_1136_li
#Page store: adding data to new database is now faster.
@changelog_1134_li
@changelog_1137_li
#File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1135_li
@changelog_1138_li
#PgServer: incorrect SQL types were returned in result set meta data. Concurrently opening a database could fail (PG catalog initialization was not synchronized). Thanks a lot to Sergi Vladykin for providing the patches!
@changelog_1136_li
@changelog_1139_li
#SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1137_li
@changelog_1140_li
#Page store: the wrong write count was written to the database header. This could cause the server-less multi-connection mode to fail.
@changelog_1138_li
@changelog_1141_li
#Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1139_li
@changelog_1142_li
#If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1140_li
@changelog_1143_li
#Alter table is now supported even if a table has views defined.
@changelog_1141_li
@changelog_1144_li
#Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1142_li
@changelog_1145_li
#The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1143_li
@changelog_1146_li
#Trigger can now be called on rollback.
@changelog_1144_li
@changelog_1147_li
#The shell script h2.sh ignored command line line arguments.
@changelog_1145_li
@changelog_1148_li
#When running H2 in the Google AppEngine for Java, a AccessControlException could be thrown when trying to open a read-only database. Fixed.
@changelog_1146_li
@changelog_1149_li
#The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1147_li
@changelog_1150_li
#Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1148_li
@changelog_1151_li
#The .trace.db file is now only created if required.
@changelog_1149_li
@changelog_1152_li
#Shell tool: improved PostgreSQL compatibility.
@changelog_1150_li
@changelog_1153_li
#Trying to open a database in read-only mode when a .lock.db file exists will now fail with a nice error message.
@changelog_1151_li
@changelog_1154_li
#H2 Console: data that is too long is now abbreviated as follows: text... (100000 characters). A large binary is abbreviated as follows: abcdef... (100000 bytes).
@changelog_1152_li
@changelog_1155_li
#Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1153_li
@changelog_1156_li
#Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1154_li
@changelog_1157_li
#CompressLZF: Faster decompress and improved javadocs
@changelog_1155_h2
@changelog_1158_h2
#Version 1.2.126 (2009-12-18)
@changelog_1156_li
@changelog_1159_li
#The ChangeFileEncryption tool will now fail with an exception if the database is still in use. The Backup tool will also fail except when running in quiet mode.
@changelog_1157_li
@changelog_1160_li
#CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1158_li
@changelog_1161_li
#Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1159_li
@changelog_1162_li
#Script command and tool: the primary key constraint is now listed before inserting the data. This will result in a smaller database when using the page store.
@changelog_1160_li
@changelog_1163_li
#Statements with IN(SELECT..) conditions could produce the wrong result. Example: index on id, name; query: select * from test where id between 1 and 3 and name in (select 'World').
@changelog_1161_li
@changelog_1164_li
#Statements with IN(..) conditions could produce the wrong result when using views or nested select statements. Example: index on id; index on name; query: select * from (select * from test) where id=1 and name in('a', 'b'). select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1162_li
@changelog_1165_li
#Page store: a rollback of a relatively large transaction could fail with an ArrayIndexOutOfBoundsException or a 'row not found' exception in the PageBtreeIndex in some cases.
@changelog_1163_li
@changelog_1166_li
#JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1164_li
@changelog_1167_li
#LIKE: any letter is now allowed after the escape character (which is still '\' by default). Previously, an exception was thrown (unlike other databases) if it was not the escape character, '_' or '%'. If the escape character appears at the end of the pattern, the result is it is ignored (like PostgreSQL and MS SQL Server).
@changelog_1165_li
@changelog_1168_li
#The reserve heap memory is no longer used.
@changelog_1166_li
@changelog_1169_li
#Database.checkpoint() could throw a NullPointerException.
@changelog_1167_h2
@changelog_1170_h2
#Version 1.2.125 (2009-12-06)
@changelog_1168_li
@changelog_1171_li
#Lucene fulltext search: the Lucene field names now match the table column names, except if the column names start with _ (in which case another _ is prepended). Unfortunately this change means existing fulltext indexes need to be re-built.
@changelog_1169_li
@changelog_1172_li
#The shell tool now has a very simple statement history.
@changelog_1170_li
@changelog_1173_li
#The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1171_li
@changelog_1174_li
#Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1172_li
@changelog_1175_li
#Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1173_li
@changelog_1176_li
#Trying to alter a temporary table threw a strange exception. It is still not possible to do that, but the exception message is better now.
@changelog_1174_li
@changelog_1177_li
#When the system property h2.maxMemoryRowsDistinct was set, and using SELECT DISTINCT, the temporary table was not correctly dropped. This could cause problems in recovery when the process was killed.
@changelog_1175_li
@changelog_1178_li
#Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1176_li
@changelog_1179_li
#Non-row based triggers were called even if the action didn't match the declared action (INSERT triggers were also called when deleting rows). This has been changed. The MERGE statement calls both INSERT and DELETE triggers.
@changelog_1177_li
@changelog_1180_li
#Statements with IN(..) conditions could produce the wrong result or a data conversion error (since version 1.2.120). Examples: index on id, name, condition: id=1 and name in('Hello', 'x'); index on id, query: select * from (select * from test) where id=1 and name in('Hello', 'World').
@changelog_1178_li
@changelog_1181_li
#The CompressTool was not multithreading safe. Because of this, the following database operations where also not multithreading safe (even when using different databases): the SCRIPT command (only when using compression), the COMPRESS function, and storing CLOB or BLOB data (only when compression is enabled).
@changelog_1179_li
@changelog_1182_li
#The compression algorithm "LZF" is now about 33% faster than before when compressing small block (around 2 KB). It is much faster than Deflate, but the compression ratio is lower. Some of the optimizations are from Sam Van Oort, thanks a lot!
@changelog_1180_li
@changelog_1183_li
#Compressing large blocks of data didn't work when using the "Deflate" compression algorithm. Compressing a lot of data could run out of heap memory.
@changelog_1181_li
@changelog_1184_li
#The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1182_li
@changelog_1185_li
#More bugs in the server-less multi-connection mode have been fixed.
@changelog_1183_li
@changelog_1186_li
#When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1184_li
@changelog_1187_li
#JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1185_li
@changelog_1188_li
#User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1186_li
@changelog_1189_li
#User defined functions with source code didn't work after re-opening the database.
@changelog_1187_li
@changelog_1190_li
#The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1188_li
@changelog_1191_li
#The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1189_li
@changelog_1192_li
#Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1190_li
@changelog_1193_li
#Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1191_h2
@changelog_1194_h2
#Version 1.2.124 (2009-11-20)
@changelog_1192_li
@changelog_1195_li
#Clustering: there is now a way to detect which cluster instances are running.
@changelog_1193_li
@changelog_1196_li
#ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1194_li
@changelog_1197_li
#The file lock thread is now stopped when the database is closed.
@changelog_1195_li
@changelog_1198_li
#Issue 140: the Script tool now supports writing to a stream.
@changelog_1196_li
@changelog_1199_li
#Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1197_li
@changelog_1200_li
#Page store: new databases can not be opened with older versions.
@changelog_1198_li
@changelog_1201_li
#Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1199_li
@changelog_1202_li
#Page store: opening a database could theoretically result in an endless loop.
@changelog_1200_li
@changelog_1203_li
#Page store: adding large indexed columns could get very slow.
@changelog_1201_li
@changelog_1204_li
#Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1202_li
@changelog_1205_li
#Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1203_li
@changelog_1206_li
#Page store: sometimes opening a read-only database failed.
@changelog_1204_li
@changelog_1207_li
#Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1205_li
@changelog_1208_li
#Page store: when using a very small page size (128 bytes or smaller), writing a large row could result in an endless recursion. This is only a theoretical problem, as the page size is 2 KB.
@changelog_1206_li
@changelog_1209_li
#Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1207_li
@changelog_1210_li
#Page store: improved auto-recovery after power failure.
@changelog_1208_li
@changelog_1211_li
#The JDBC client did not detect that it was not talking to an H2 server. This could result in strange exceptions when trying to connect to another kind of server.
@changelog_1209_li
@changelog_1212_li
#User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1210_li
@changelog_1213_li
#Database file lock: the exception "lock file modified in the future" is no longer thrown; instead, opening the file will be delayed by 2 seconds.
@changelog_1211_li
@changelog_1214_li
#Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1212_li
@changelog_1215_li
#Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1213_li
@changelog_1216_li
#Improved read-only database detection.
@changelog_1214_h2
@changelog_1217_h2
#Version 1.2.123 (2009-11-08)
@changelog_1215_li
@changelog_1218_li
#Page store: new databases can not be opened with older versions.
@changelog_1216_li
@changelog_1219_li
#Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1217_li
@changelog_1220_li
#Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1218_li
@changelog_1221_li
#When using multi-threaded kernel mode, setting disabling locking (LOCK_MODE=0) will now throw an exception. At this time this combination will result in corruption when multiple threads try to update the same table.
@changelog_1219_li
@changelog_1222_li
#The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1220_li
@changelog_1223_li
#The Lucene fulltext search now also returns the score.
@changelog_1221_li
@changelog_1224_li
# New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1222_li
@changelog_1225_li
#Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1223_li
@changelog_1226_li
#Improved error messages: identifiers and values are now quoted.
@changelog_1224_li
@changelog_1227_li
#Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1225_li
@changelog_1228_li
#Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1226_h2
@changelog_1229_h2
#Version 1.2.122 (2009-10-28)
@changelog_1227_li
@changelog_1230_li
#The native fulltext search now supports streaming CLOB data.
@changelog_1228_li
@changelog_1231_li
#If the database URL ends with ;PAGE_STORE=TRUE and a database in the old format exists, it is automatically converted to the new page store format if possible. A backup of the database is created first. Automatic conversion is not supported if the database was not closed normally (if it contains uncommitted transactions).
@changelog_1229_li
@changelog_1232_li
#Dropping the current user is now allowed if another admin user exists.
@changelog_1230_li
@changelog_1233_li
#Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1231_li
@changelog_1234_li
#SHUTDOWN COMPACT now fully compacts the database.
@changelog_1232_li
@changelog_1235_li
#New system properties h2.maxCompactCount and h2.maxCompactTime to allow changing the default behavior (at most 2 seconds compacting when closing the database).
@changelog_1233_li
@changelog_1236_li
#New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1234_li
@changelog_1237_li
#Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1235_li
@changelog_1238_li
#Page store: opening a large database was slow if it was not closed before.
@changelog_1236_li
@changelog_1239_li
#Page store: new write and read counters in the meta data table. Use SELECT * FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME IN( 'info.FILE_WRITE_TOTAL', 'info.FILE_WRITE', 'info.FILE_READ', 'info.CACHE_MAX_SIZE', 'info.CACHE_SIZE')
@changelog_1237_li
@changelog_1240_li
#The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1238_li
@changelog_1241_li
#The documentation is no longer available in Japanese because the translation was too much out of sync. Please use the Google translation instead.
@changelog_1239_li
@changelog_1242_li
#Certain queries were not sorted if subselect queries were involved
@changelog_1240_li
@changelog_1243_li
#More bugs in the server-less multi-connection mode have been fixed: 90097 The database is read only, caches must be cleared on reconnect, etc.
@changelog_1241_h2
@changelog_1244_h2
#Version 1.2.121 (2009-10-11)
@changelog_1242_li
@changelog_1245_li
#Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1243_li
@changelog_1246_li
#CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1244_li
@changelog_1247_li
#If a database in the old format exists, it is now used. The system property is used for new databases, or if databases exist in both formats. In any case, the flag in the URL overrides this logic.
@changelog_1245_li
@changelog_1248_li
#Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1246_li
@changelog_1249_li
#The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1247_li
@changelog_1250_li
#New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1248_h2
@changelog_1251_h2
#Version 1.2.120 (2009-10-04)
@changelog_1249_li
@changelog_1252_li
#This is a beta version.
@changelog_1250_li
@changelog_1253_li
#Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1251_li
@changelog_1254_li
#In version 1.2, the following system properties are now enabled by default: h2.pageStore, h2.nullConcatIsNull, h2.optimizeInList. The default value for h2.defaultMaxLengthInplaceLob is now 4096 (it was 1024 with version 1.1).
@changelog_1252_li
@changelog_1255_li
#New databases are now stored in the new 'page store' file format. Existing databases are kept in the old file format. To use the old file format, append ;PAGE_STORE=FALSE to the database URL or set the system property h2.pageStore to false.
@changelog_1253_li
@changelog_1256_li
#Issue 125: Renaming primary keys was not persistent. Fixed. Unfortunately, databases created by this version can not be opened with older versions because of this change.
@changelog_1254_li
@changelog_1257_li
#Issue 124: Hibernate schema validation failed for decimal/numeric columns. This problem is fixed in the Hibernate dialect that is included with H2 (src/tools/org/hibernate/dialect/H2Dialect.java.txt), but not in Hibernate yet.
@changelog_1255_li
@changelog_1258_li
#PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1256_li
@changelog_1259_li
#Linked tables now support default values when inserting, updating or merging.
@changelog_1257_li
@changelog_1260_li
#Bugfixes in the page store.
@changelog_1258_li
@changelog_1261_li
#Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1259_li
@changelog_1262_li
#Allow writing to linked tables in readonly databases.
@changelog_1260_h2
@changelog_1263_h2
#Version 1.1.119 (2009-09-26)
@changelog_1261_li
@changelog_1264_li
#SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1262_li
@changelog_1265_li
#Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1263_li
@changelog_1266_li
#New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1264_li
@changelog_1267_li
#New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1265_li
@changelog_1268_li
#The cache algorithm TQ is disabled in this version, because it is unstable, and because the current implementation does not have any measurable advantages over the default.
@changelog_1266_li
@changelog_1269_li
#New committer: Christian Peter. He works for <a href="http://www.docware.com">Docware</a> and helped a lot finding and fixing bugs, and generally improving the database. He is now a committer.
@changelog_1267_li
@changelog_1270_li
#ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1268_li
@changelog_1271_li
#Issue 121: JaQu: new simple update and merge methods.
@changelog_1269_li
@changelog_1272_li
#Issue 120: JaQu didn't close result sets.
@changelog_1270_li
@changelog_1273_li
#Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1271_li
@changelog_1274_li
#The new page store mechanism is now alpha-level quality. The next release will most likely be "1.2.120 beta" where this mode is enabled by default. To use it right now, append ;PAGE_STORE=TRUE to the database URL. The file format of this mode will probably not change any more.
@changelog_1272_li
@changelog_1275_li
#SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1273_li
@changelog_1276_li
#The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1274_li
@changelog_1277_li
#New sample application that shows how to pass data to a trigger.
@changelog_1275_li
@changelog_1278_li
#More bugs in the server-less multi-connection mode have been fixed: On Windows, two processes could write to the same database at the same time.
@changelog_1276_li
@changelog_1279_li
#When loading triggers or other client classes (static functions, database event listener, user aggregate functions, other JDBC drivers), the database now uses the context class loader if the class could not be found using Class.forName().
@changelog_1277_li
@changelog_1280_li
#Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1278_li
@changelog_1281_li
#Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1279_li
@changelog_1282_li
#The native fulltext index kept a reference to a database after the database was closed.
@changelog_1280_li
@changelog_1283_li
#Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1281_li
@changelog_1284_li
#The optimizer does a better job for joins if indexes are missing.
@changelog_1282_h2
@changelog_1285_h2
#Version 1.1.118 (2009-09-04)
@changelog_1283_li
@changelog_1286_li
#SHOW COLUMNS only listed indexed columns.
@changelog_1284_li
@changelog_1287_li
#When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1285_li
@changelog_1288_li
#DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1286_li
@changelog_1289_li
#AUTO_INCREMENT now works in the same way in ALTER TABLE ALTER COLUMN as in CREATE TABLE (it does not create a primary key).
@changelog_1287_li
@changelog_1290_li
#Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1288_li
@changelog_1291_li
#Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1289_li
@changelog_1292_li
#JaQu: the plan is to support natural (pure Java / Scala) conditions such as (id == 1 && name.equals("Test")). A proof of concept decompiler is now included (it doesn't work yet).
@changelog_1290_li
@changelog_1293_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1291_li
@changelog_1294_li
#PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1292_li
@changelog_1295_li
#H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1293_li
@changelog_1296_li
#Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1294_li
@changelog_1297_li
#H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1295_li
@changelog_1298_li
#Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1296_li
@changelog_1299_li
#Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1297_li
@changelog_1300_li
#Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1298_li
@changelog_1301_li
#Issue 101: The following sequence could throw the exception "Row not found when trying to delete": start a transaction, insert many rows, delete many rows, rollback. The number of rows depends on the cache size.
@changelog_1299_li
@changelog_1302_li
#The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1300_li
@changelog_1303_li
#An optimization for OR is implemented, but disabled by default. Expressions of the type X=1 OR X=2 are converted to X IN(1, 2). To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver.
@changelog_1301_li
@changelog_1304_li
#An optimization for IN(..) and IN(SELECT...) is implemented, but disabled by default. To enable, set the system property h2.optimizeInList to true before loading the H2 JDBC driver. If enabled, this overrides h2.optimizeIn and h2.optimizeInJoin. Unlike now, this optimization will also speed up updates and deletes.
@changelog_1302_h2
@changelog_1305_h2
#Version 1.1.117 (2009-08-09)
@changelog_1303_li
@changelog_1306_li
#New committer: Sam Van Oort has been contributing to H2 since quite some time in many ways (on the mailing list, documentation, and in the form of patches). He is now a committer.
@changelog_1304_li
@changelog_1307_li
#JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1305_li
@changelog_1308_li
#Issue 103: MVCC: the setting MAX_MEMORY_UNDO can currently not be supported when using multi-version concurrency, that means the complete undo log must fit in memory.
@changelog_1306_li
@changelog_1309_li
#LIKE: the escape mechanism can now be disable using ESCAPE ''. The default escape character can be changed using the system property h2.defaultEscape. The default is still '\' (as in MySQL and PostgreSQL).
@changelog_1307_li
@changelog_1310_li
#Views using functions were not re-evaluated when necessary.
@changelog_1308_li
@changelog_1311_li
#Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1309_li
@changelog_1312_li
#Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1310_li
@changelog_1313_li
#Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1311_li
@changelog_1314_li
#Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1312_li
@changelog_1315_li
#Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1313_li
@changelog_1316_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1314_li
@changelog_1317_li
#The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1315_li
@changelog_1318_li
#Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1316_li
@changelog_1319_li
#Multi-threaded kernel: creating and dropping temporary database objects and the potentially free pages list was not correctly synchronized. Thanks a lot to Eric Faulhaber for the test case and patch!
@changelog_1317_li
@changelog_1320_li
#Parsing SQL script files is now faster.
@changelog_1318_li
@changelog_1321_li
#CSV reading is now faster.
@changelog_1319_li
@changelog_1322_li
#SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1320_h2
@changelog_1323_h2
#Version 1.1.116 (2009-07-18)
@changelog_1321_li
@changelog_1324_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1322_li
@changelog_1325_li
#The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1323_li
@changelog_1326_li
#H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1324_li
@changelog_1327_li
#ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1325_li
@changelog_1328_li
#Creating indexes is now a bit faster.
@changelog_1326_li
@changelog_1329_li
#PG Server: new system property h2.pgClientEncoding to explicitly set the encoding for clients that don't send the encoding (the default encoding is UTF-8). Thanks a lot to Sergi Vladykin for the patch!
@changelog_1327_li
@changelog_1330_li
#PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1328_li
@changelog_1331_li
#H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1329_li
@changelog_1332_li
#Result sets are now read-only except if the statement or prepared statement was created with the concurrency ResultSet.CONCUR_UPDATABLE. This change is required because the old behavior (all result set are updatable) violated the JDBC spec. For backward compatibility, use the system property h2.defaultResultSetConcurrency.
@changelog_1330_li
@changelog_1333_li
#New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1331_li
@changelog_1334_li
#JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1332_li
@changelog_1335_li
#If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1333_li
@changelog_1336_li
#Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1334_li
@changelog_1337_li
#The Recover tool did not work with .data.db files of the wrong size.
@changelog_1335_li
@changelog_1338_li
#Triggers: if there was an exception when initializing a trigger, this exception could be hidden, and in some cases (specially when using the Lucene fulltext index mechanism) a NullPointerException was thrown later on. Now the exception that occurred on init is thrown when changing data.
@changelog_1336_li
@changelog_1339_li
#The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1337_li
@changelog_1340_li
#To enable the new page store mechanism, append ;PAGE_STORE=TRUE to the database URL. or set the system property h2.pageStore to true. This mechanism is still experimental, and the file format will change, but it is quite stable now.
@changelog_1338_h2
@changelog_1341_h2
#Version 1.1.115 (2009-06-21)
@changelog_1339_li
@changelog_1342_li
#The new storage mechanism is now alpha quality. To try it out, set the system property "h2.pageStore" to "true" (java -Dh2.pageStore=true). There are still bugs to be found and fixed, for example inserting many rows references a lot of main memory. Performance is currently about the same as with the regular storage mechanism, but the database file size is smaller. The file format is not stable yet.
@changelog_1340_li
@changelog_1343_li
#ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1341_li
@changelog_1344_li
#Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1342_li
@changelog_1345_li
#java.util.UUID is now supported in PreparedStatement.setObject and user defined Java functions. ResultSet.getObject() returns a java.util.UUID when using the UUID data type.
@changelog_1343_li
@changelog_1346_li
#H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1344_li
@changelog_1347_li
#H2 Console: improved Polish translation.
@changelog_1345_li
@changelog_1348_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1346_li
@changelog_1349_li
#The download page now included the SHA1 checksums.
@changelog_1347_li
@changelog_1350_li
#Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1348_li
@changelog_1351_li
#The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1349_li
@changelog_1352_li
#Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1350_li
@changelog_1353_li
#Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1351_li
@changelog_1354_li
#Backup: if the database contained CLOB or BLOB data, the backup included a file entry for the LOB directory. This caused the restore to fail.
@changelog_1352_li
@changelog_1355_li
#Data types: LONG is now an alias for BIGINT.
@changelog_1353_h2
@changelog_1356_h2
#Version 1.1.114 (2009-06-01)
@changelog_1354_li
@changelog_1357_li
#ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1355_li
@changelog_1358_li
#Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1356_li
@changelog_1359_li
#In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1357_li
@changelog_1360_li
#Microsoft Windows Vista: when using the the installer, Vista wrote "This program may not have installed correctly." This message should no longer appear (in the h2.nsi file, the line 'RequestExecutionLevel highest' was added).
@changelog_1358_li
@changelog_1361_li
#The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1359_li
@changelog_1362_li
#Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
# In addition to the built-in functions, this database supports user-defined Java functions. In this database, Java functions can be used as stored procedures as well. A function must be declared (registered) before it can be used. A functions can be defined using source code, or as a reference to a compiled class that is available in the classpath.
# In addition to the built-in functions, this database supports user-defined Java functions. In this database, Java functions can be used as stored procedures as well. A function must be declared (registered) before it can be used. A function can be defined using source code, or as a reference to a compiled class that is available in the classpath. By default, the function aliases are stored in the current schema.
@features_1569_h3
#Referencing a Compiled Method
...
...
@@ -8272,671 +8281,671 @@ H2 コンソール アプリケーション
@roadmap_1004_li
#Automatic ANALYZE: set the system property h2.analyzeAuto to 2000.
@roadmap_1005_h2
@roadmap_1005_li
#Enable h2.functionsInSchema.
@roadmap_1006_h2
#Priority 1
@roadmap_1006_li
@roadmap_1007_li
#Bugfixes
@roadmap_1007_li
@roadmap_1008_li
#Support very large transactions. Reduce memory usage of undo log.
@roadmap_1008_li
@roadmap_1009_li
#More tests with MULTI_THREADED=1
@roadmap_1009_li
@roadmap_1010_li
#Optimization: result set caching (like MySQL); option to disable
@roadmap_1010_li
@roadmap_1011_li
#Server side cursors
@roadmap_1011_h2
@roadmap_1012_h2
#Priority 2
@roadmap_1012_li
@roadmap_1013_li
#Improve test code coverage.
@roadmap_1013_li
@roadmap_1014_li
#Test multi-threaded in-memory db access
@roadmap_1014_li
@roadmap_1015_li
#MVCC: select for update should only lock the selected rows.
@roadmap_1015_li
@roadmap_1016_li
#Option to shutdown all the running servers (on the same VM).
@roadmap_1016_li
@roadmap_1017_li
#Full outer joins.
@roadmap_1017_li
@roadmap_1018_li
#Support nested outer joins (see todo.txt).
@roadmap_1018_li
@roadmap_1019_li
#Clustering: recovery needs to becomes fully automatic. Global write lock feature.
@roadmap_1019_li
@roadmap_1020_li
#Clustering: support mixed clustering mode (one embedded, others in server mode).
@roadmap_1020_li
@roadmap_1021_li
#Clustering: reads should be randomly distributed (optional) or to a designated database on RAM (parameter: READ_FROM=3).
@roadmap_1021_li
@roadmap_1022_li
#PostgreSQL catalog: use BEFORE SELECT triggers instead of views over metadata tables.
@roadmap_1022_li
@roadmap_1023_li
#Test very large databases and LOBs (up to 256 GB).
@roadmap_1023_li
@roadmap_1024_li
#Support hints for the optimizer (which index to use, enforce the join order).
@roadmap_1024_li
@roadmap_1025_li
#Sequence: add features [NO] MINVALUE, MAXVALUE, CYCLE.
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files.
@roadmap_1064_li
@roadmap_1065_li
#iReport to support H2.
@roadmap_1065_li
@roadmap_1066_li
#Implement missing JDBC API (CallableStatement,...).
@roadmap_1066_li
@roadmap_1067_li
#Compression of the cache.
@roadmap_1067_li
@roadmap_1068_li
#Include SMPT (mail) client (alert on cluster failure, low disk space,...).
@roadmap_1068_li
@roadmap_1069_li
#Drop with restrict (currently cascade is the default).
@roadmap_1069_li
@roadmap_1070_li
#JSON parser and functions.
@roadmap_1070_li
@roadmap_1071_li
#Server: client ping from time to time (to avoid timeout - is timeout a problem?).
@roadmap_1071_li
@roadmap_1072_li
#Copy database: tool with config GUI and batch mode, extensible (example: compare).
@roadmap_1072_li
@roadmap_1073_li
#Document, implement tool for long running transactions using user-defined compensation statements.
@roadmap_1073_li
@roadmap_1074_li
#Support SET TABLE DUAL READONLY.
@roadmap_1074_li
@roadmap_1075_li
#GCJ: what is the state now?
@roadmap_1075_li
#Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server. See http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html
@roadmap_1076_li
#Optimization: log compression.
#Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server. See http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html
@roadmap_1077_li
#ROW_NUMBER() OVER([ORDER BY columnName]).
#Optimization: log compression.
@roadmap_1078_li
#Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt - specially KEY_COLUMN_USAGE: http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif
#ROW_NUMBER() OVER([ORDER BY columnName]).
@roadmap_1079_li
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero.
#Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt - specially KEY_COLUMN_USAGE: http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif
@roadmap_1080_li
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R).
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero.
@roadmap_1081_li
#Custom class loader to reload functions on demand.
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R).
@roadmap_1082_li
#Clustering: when a database is back alive, automatically synchronize with the master.
#Custom class loader to reload functions on demand.
@roadmap_1083_li
#Test http://mysql-je.sourceforge.net/
#Clustering: when a database is back alive, automatically synchronize with the master.
@roadmap_1084_li
#EXE file: maybe use http://jsmooth.sourceforge.net
#Test http://mysql-je.sourceforge.net/
@roadmap_1085_li
#Performance: automatically build in-memory indexes if the whole table is in memory.
#EXE file: maybe use http://jsmooth.sourceforge.net
@roadmap_1086_li
#H2 Console: the webclient could support more features like phpMyAdmin.
#Performance: automatically build in-memory indexes if the whole table is in memory.
@roadmap_1087_li
#Use Janino to convert Java to C++.
#H2 Console: the webclient could support more features like phpMyAdmin.
@roadmap_1088_li
#The HELP information schema can be directly exposed in the Console.
#Use Janino to convert Java to C++.
@roadmap_1089_li
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server.
#The HELP information schema can be directly exposed in the Console.
@roadmap_1090_li
#Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html http://philip.greenspun.com/sql/trees.html
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server.
@roadmap_1091_li
#SQL Server 2005, Oracle: support COUNT(*) OVER(). See http://www.orafusion.com/art_anlytc.htm
#Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html http://philip.greenspun.com/sql/trees.html
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
#Option to encrypt .trace.db file.
@roadmap_1113_li
#Functions with unknown return or parameter data types: serialize / deserialize.
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
@roadmap_1114_li
#Test if idle TCP connections are closed, and how to disable that.
#Functions with unknown return or parameter data types: serialize / deserialize.
@roadmap_1115_li
#Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
#Test if idle TCP connections are closed, and how to disable that.
@roadmap_1116_li
#Auto-Update feature for database, .jar file.
#Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
@roadmap_1117_li
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
#Auto-Update feature for database, .jar file.
@roadmap_1118_li
#Partial indexing (see PostgreSQL).
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
@roadmap_1119_li
#Add GUI to build a custom version (embedded, fulltext,...) using build flags.
#Partial indexing (see PostgreSQL).
@roadmap_1120_li
#http://rubyforge.org/projects/hypersonic/
#Add GUI to build a custom version (embedded, fulltext,...) using build flags.
@roadmap_1121_li
#Add comparator (x === y) : (x = y or (x is null and y is null)).
#http://rubyforge.org/projects/hypersonic/
@roadmap_1122_li
#Try to create trace file even for read only databases.
#Add comparator (x === y) : (x = y or (x is null and y is null)).
@roadmap_1123_li
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
#Try to create trace file even for read only databases.
@roadmap_1124_li
#Count on a column that can not be null could be optimized to COUNT(*).
#Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
@roadmap_1125_li
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
#Count on a column that can not be null could be optimized to COUNT(*).
@roadmap_1126_li
#Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
@roadmap_1127_li
#Backup tool should work with other databases as well.
#Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
@roadmap_1128_li
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
#Backup tool should work with other databases as well.
@roadmap_1129_li
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess).
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
#Implement Clob / Blob truncate and the remaining functionality.
#Compatibility for CREATE SCHEMA AUTHORIZATION.
@roadmap_1134_li
#Tree join functionality.
#Implement Clob / Blob truncate and the remaining functionality.
@roadmap_1135_li
#Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
#Tree join functionality.
@roadmap_1136_li
#Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
#Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
@roadmap_1137_li
#Pure SQL triggers (example: update parent table if the child table is changed).
#Use JDK 1.4 file locking for the database file and for the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1138_li
#Add H2 to Gem (Ruby install system).
#Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1139_li
#API for functions / user tables.
#Add H2 to Gem (Ruby install system).
@roadmap_1140_li
#Order conditions inside AND / OR to optimize the performance.
#Make sure H2 is supported by Execute Query: http://executequery.org/
#Support linked JCR tables
@roadmap_1144_li
#Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
#Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1145_li
#Native fulltext search: min word length; store word positions
#Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1146_li
#Add an option to the SCRIPT command to generate only portable / standard SQL
#Native fulltext search: min word length; store word positions
@roadmap_1147_li
#Test Dezign for Databases: http://www.datanamic.com
#Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1148_li
#Fast library for parsing / formatting: http://javolution.org/
#Test Dezign for Databases: http://www.datanamic.com
@roadmap_1149_li
#Updatable Views (simple cases first)
#Fast library for parsing / formatting: http://javolution.org/
@roadmap_1150_li
#Improve create index performance
#Updatable Views (simple cases first)
@roadmap_1151_li
#Implement more JDBC 4.0 features
#Improve create index performance
@roadmap_1152_li
#Support TRANSFORM / PIVOT as in MS Access
#Implement more JDBC 4.0 features
@roadmap_1153_li
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
#Support TRANSFORM / PIVOT as in MS Access
@roadmap_1154_li
#Support updatable views with join on primary keys (to extend a table)
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1155_li
#Public interface for functions (not public static)
#Support updatable views with join on primary keys (to extend a table)
@roadmap_1156_li
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
#Public interface for functions (not public static)
@roadmap_1157_li
#Support reading the transaction log.
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1158_li
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
#Support reading the transaction log.
@roadmap_1159_li
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1160_li
#Updatable result set on table without primary key or unique index
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1161_li
#Use LinkedList instead of ArrayList where applicable
#Updatable result set on table without primary key or unique index
@roadmap_1162_li
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
#Use LinkedList instead of ArrayList where applicable
@roadmap_1163_li
#Support % operator (modulo)
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1164_li
#Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
#Support % operator (modulo)
@roadmap_1165_li
#Support nested transactions
#Support JMX: create an MBean for each database and server (support JConsole). See http://thedevcloud.blogspot.com/2008/10/displaying-hsql-database-manager-in.html http://java.sun.com/j2se/1.5.0/docs/api/java/lang/management/ManagementFactory.html#getPlatformMBeanServer() http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html
@roadmap_1166_li
#Add a benchmark for big databases, and one for many users
#Support nested transactions
@roadmap_1167_li
#Compression in the result set (repeating values in the same column) over TCP/IP
#Add a benchmark for big databases, and one for many users
@roadmap_1168_li
#Support curtimestamp (like curtime, curdate)
#Compression in the result set (repeating values in the same column) over TCP/IP
