Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
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_1003_li
MVCC: if the page store is disabled, rollback of multiple rows with the same index key did not work correctly.
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_1004_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1005_li
Slightly improved performance if the table is already locked.
Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1006_li
CompressLZF: faster decompression.
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_1007_li
If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1008_li
Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1009_li
MVCC: if the page store is disabled, rollback of multiple rows with the same index key did not work correctly.
@changelog_1010_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1011_li
Slightly improved performance if the table is already locked.
@changelog_1012_li
CompressLZF: faster decompression.
@changelog_1013_li
PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1008_h2
@changelog_1014_li
Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1015_h2
Version 1.2.127 (2010-01-15)
@changelog_1009_li
@changelog_1016_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_1010_li
@changelog_1017_li
Page store: new databases can not be opened with older versions.
@changelog_1011_li
@changelog_1018_li
Page store: adding data to new database is now faster.
@changelog_1012_li
@changelog_1019_li
File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1013_li
@changelog_1020_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_1014_li
@changelog_1021_li
SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1015_li
@changelog_1022_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_1016_li
@changelog_1023_li
Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1017_li
@changelog_1024_li
If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1018_li
@changelog_1025_li
Alter table is now supported even if a table has views defined.
@changelog_1019_li
@changelog_1026_li
Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1020_li
@changelog_1027_li
The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1021_li
@changelog_1028_li
Trigger can now be called on rollback.
@changelog_1022_li
@changelog_1029_li
The shell script h2.sh ignored command line line arguments.
@changelog_1023_li
@changelog_1030_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_1024_li
@changelog_1031_li
The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1025_li
@changelog_1032_li
Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1026_li
@changelog_1033_li
The .trace.db file is now only created if required.
@changelog_1027_li
@changelog_1034_li
Shell tool: improved PostgreSQL compatibility.
@changelog_1028_li
@changelog_1035_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_1029_li
@changelog_1036_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_1030_li
@changelog_1037_li
Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1031_li
@changelog_1038_li
Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1032_li
@changelog_1039_li
CompressLZF: Faster decompress and improved javadocs
@changelog_1033_h2
@changelog_1040_h2
Version 1.2.126 (2009-12-18)
@changelog_1034_li
@changelog_1041_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_1035_li
@changelog_1042_li
CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1036_li
@changelog_1043_li
Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1037_li
@changelog_1044_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_1038_li
@changelog_1045_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_1039_li
@changelog_1046_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_1040_li
@changelog_1047_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_1041_li
@changelog_1048_li
JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1042_li
@changelog_1049_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_1043_li
@changelog_1050_li
The reserve heap memory is no longer used.
@changelog_1044_li
@changelog_1051_li
Database.checkpoint() could throw a NullPointerException.
@changelog_1045_h2
@changelog_1052_h2
Version 1.2.125 (2009-12-06)
@changelog_1046_li
@changelog_1053_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_1047_li
@changelog_1054_li
The shell tool now has a very simple statement history.
@changelog_1048_li
@changelog_1055_li
The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1049_li
@changelog_1056_li
Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1050_li
@changelog_1057_li
Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1051_li
@changelog_1058_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_1052_li
@changelog_1059_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_1053_li
@changelog_1060_li
Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1054_li
@changelog_1061_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_1055_li
@changelog_1062_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_1056_li
@changelog_1063_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_1057_li
@changelog_1064_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_1058_li
@changelog_1065_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_1059_li
@changelog_1066_li
The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1060_li
@changelog_1067_li
More bugs in the server-less multi-connection mode have been fixed.
@changelog_1061_li
@changelog_1068_li
When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1062_li
@changelog_1069_li
JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1063_li
@changelog_1070_li
User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1064_li
@changelog_1071_li
User defined functions with source code didn't work after re-opening the database.
@changelog_1065_li
@changelog_1072_li
The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1066_li
@changelog_1073_li
The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1067_li
@changelog_1074_li
Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1068_li
@changelog_1075_li
Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1069_h2
@changelog_1076_h2
Version 1.2.124 (2009-11-20)
@changelog_1070_li
@changelog_1077_li
Clustering: there is now a way to detect which cluster instances are running.
@changelog_1071_li
@changelog_1078_li
ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1072_li
@changelog_1079_li
The file lock thread is now stopped when the database is closed.
@changelog_1073_li
@changelog_1080_li
Issue 140: the Script tool now supports writing to a stream.
@changelog_1074_li
@changelog_1081_li
Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1075_li
@changelog_1082_li
Page store: new databases can not be opened with older versions.
@changelog_1076_li
@changelog_1083_li
Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1077_li
@changelog_1084_li
Page store: opening a database could theoretically result in an endless loop.
@changelog_1078_li
@changelog_1085_li
Page store: adding large indexed columns could get very slow.
@changelog_1079_li
@changelog_1086_li
Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1080_li
@changelog_1087_li
Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1081_li
@changelog_1088_li
Page store: sometimes opening a read-only database failed.
@changelog_1082_li
@changelog_1089_li
Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1083_li
@changelog_1090_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_1084_li
@changelog_1091_li
Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1085_li
@changelog_1092_li
Page store: improved auto-recovery after power failure.
@changelog_1086_li
@changelog_1093_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_1087_li
@changelog_1094_li
User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1088_li
@changelog_1095_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_1089_li
@changelog_1096_li
Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1090_li
@changelog_1097_li
Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1091_li
@changelog_1098_li
Improved read-only database detection.
@changelog_1092_h2
@changelog_1099_h2
Version 1.2.123 (2009-11-08)
@changelog_1093_li
@changelog_1100_li
Page store: new databases can not be opened with older versions.
@changelog_1094_li
@changelog_1101_li
Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1095_li
@changelog_1102_li
Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1096_li
@changelog_1103_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_1097_li
@changelog_1104_li
The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1098_li
@changelog_1105_li
The Lucene fulltext search now also returns the score.
@changelog_1099_li
@changelog_1106_li
New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1100_li
@changelog_1107_li
Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1101_li
@changelog_1108_li
Improved error messages: identifiers and values are now quoted.
@changelog_1102_li
@changelog_1109_li
Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1103_li
@changelog_1110_li
Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1104_h2
@changelog_1111_h2
Version 1.2.122 (2009-10-28)
@changelog_1105_li
@changelog_1112_li
The native fulltext search now supports streaming CLOB data.
@changelog_1106_li
@changelog_1113_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_1107_li
@changelog_1114_li
Dropping the current user is now allowed if another admin user exists.
@changelog_1108_li
@changelog_1115_li
Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1109_li
@changelog_1116_li
SHUTDOWN COMPACT now fully compacts the database.
@changelog_1110_li
@changelog_1117_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_1111_li
@changelog_1118_li
New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1112_li
@changelog_1119_li
Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1113_li
@changelog_1120_li
Page store: opening a large database was slow if it was not closed before.
@changelog_1114_li
@changelog_1121_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_1115_li
@changelog_1122_li
The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1116_li
@changelog_1123_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_1117_li
@changelog_1124_li
Certain queries were not sorted if subselect queries were involved
@changelog_1118_li
@changelog_1125_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_1119_h2
@changelog_1126_h2
Version 1.2.121 (2009-10-11)
@changelog_1120_li
@changelog_1127_li
Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1121_li
@changelog_1128_li
CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1122_li
@changelog_1129_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_1123_li
@changelog_1130_li
Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1124_li
@changelog_1131_li
The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1125_li
@changelog_1132_li
New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1126_h2
@changelog_1133_h2
Version 1.2.120 (2009-10-04)
@changelog_1127_li
@changelog_1134_li
This is a beta version.
@changelog_1128_li
@changelog_1135_li
Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1129_li
@changelog_1136_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_1130_li
@changelog_1137_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_1131_li
@changelog_1138_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_1132_li
@changelog_1139_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_1133_li
@changelog_1140_li
PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1134_li
@changelog_1141_li
Linked tables now support default values when inserting, updating or merging.
@changelog_1135_li
@changelog_1142_li
Bugfixes in the page store.
@changelog_1136_li
@changelog_1143_li
Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1137_li
@changelog_1144_li
Allow writing to linked tables in readonly databases.
@changelog_1138_h2
@changelog_1145_h2
Version 1.1.119 (2009-09-26)
@changelog_1139_li
@changelog_1146_li
SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1140_li
@changelog_1147_li
Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1141_li
@changelog_1148_li
New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1142_li
@changelog_1149_li
New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1143_li
@changelog_1150_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_1144_li
@changelog_1151_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_1145_li
@changelog_1152_li
ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1146_li
@changelog_1153_li
Issue 121: JaQu: new simple update and merge methods.
@changelog_1147_li
@changelog_1154_li
Issue 120: JaQu didn't close result sets.
@changelog_1148_li
@changelog_1155_li
Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1149_li
@changelog_1156_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_1150_li
@changelog_1157_li
SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1151_li
@changelog_1158_li
The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1152_li
@changelog_1159_li
New sample application that shows how to pass data to a trigger.
@changelog_1153_li
@changelog_1160_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_1154_li
@changelog_1161_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_1155_li
@changelog_1162_li
Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1156_li
@changelog_1163_li
Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1157_li
@changelog_1164_li
The native fulltext index kept a reference to a database after the database was closed.
@changelog_1158_li
@changelog_1165_li
Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1159_li
@changelog_1166_li
The optimizer does a better job for joins if indexes are missing.
@changelog_1160_h2
@changelog_1167_h2
Version 1.1.118 (2009-09-04)
@changelog_1161_li
@changelog_1168_li
SHOW COLUMNS only listed indexed columns.
@changelog_1162_li
@changelog_1169_li
When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1163_li
@changelog_1170_li
DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1164_li
@changelog_1171_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_1165_li
@changelog_1172_li
Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1166_li
@changelog_1173_li
Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1167_li
@changelog_1174_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_1168_li
@changelog_1175_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1169_li
@changelog_1176_li
PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1170_li
@changelog_1177_li
H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1171_li
@changelog_1178_li
Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1172_li
@changelog_1179_li
H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1173_li
@changelog_1180_li
Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1174_li
@changelog_1181_li
Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1175_li
@changelog_1182_li
Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1176_li
@changelog_1183_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_1177_li
@changelog_1184_li
The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1178_li
@changelog_1185_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_1179_li
@changelog_1186_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_1180_h2
@changelog_1187_h2
Version 1.1.117 (2009-08-09)
@changelog_1181_li
@changelog_1188_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_1182_li
@changelog_1189_li
JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1183_li
@changelog_1190_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_1184_li
@changelog_1191_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_1185_li
@changelog_1192_li
Views using functions were not re-evaluated when necessary.
@changelog_1186_li
@changelog_1193_li
Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1187_li
@changelog_1194_li
Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1188_li
@changelog_1195_li
Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1189_li
@changelog_1196_li
Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1190_li
@changelog_1197_li
Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1191_li
@changelog_1198_li
Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1192_li
@changelog_1199_li
The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1193_li
@changelog_1200_li
Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1194_li
@changelog_1201_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_1195_li
@changelog_1202_li
Parsing SQL script files is now faster.
@changelog_1196_li
@changelog_1203_li
CSV reading is now faster.
@changelog_1197_li
@changelog_1204_li
SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1198_h2
@changelog_1205_h2
Version 1.1.116 (2009-07-18)
@changelog_1199_li
@changelog_1206_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1200_li
@changelog_1207_li
The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1201_li
@changelog_1208_li
H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1202_li
@changelog_1209_li
ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1203_li
@changelog_1210_li
Creating indexes is now a bit faster.
@changelog_1204_li
@changelog_1211_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_1205_li
@changelog_1212_li
PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1206_li
@changelog_1213_li
H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1207_li
@changelog_1214_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_1208_li
@changelog_1215_li
New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1209_li
@changelog_1216_li
JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1210_li
@changelog_1217_li
If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1211_li
@changelog_1218_li
Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1212_li
@changelog_1219_li
The Recover tool did not work with .data.db files of the wrong size.
@changelog_1213_li
@changelog_1220_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_1214_li
@changelog_1221_li
The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1215_li
@changelog_1222_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_1216_h2
@changelog_1223_h2
Version 1.1.115 (2009-06-21)
@changelog_1217_li
@changelog_1224_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_1218_li
@changelog_1225_li
ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1219_li
@changelog_1226_li
Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1220_li
@changelog_1227_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_1221_li
@changelog_1228_li
H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1222_li
@changelog_1229_li
H2 Console: improved Polish translation.
@changelog_1223_li
@changelog_1230_li
Server-less multi-connection mode: more bugs are fixed.
@changelog_1224_li
@changelog_1231_li
The download page now included the SHA1 checksums.
@changelog_1225_li
@changelog_1232_li
Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1226_li
@changelog_1233_li
The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1227_li
@changelog_1234_li
Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1228_li
@changelog_1235_li
Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1229_li
@changelog_1236_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_1230_li
@changelog_1237_li
Data types: LONG is now an alias for BIGINT.
@changelog_1231_h2
@changelog_1238_h2
Version 1.1.114 (2009-06-01)
@changelog_1232_li
@changelog_1239_li
ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1233_li
@changelog_1240_li
Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1234_li
@changelog_1241_li
In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1235_li
@changelog_1242_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_1236_li
@changelog_1243_li
The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1237_li
@changelog_1244_li
Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1238_h2
@changelog_1245_h2
Version 1.1.113 (2009-05-21)
@changelog_1239_li
@changelog_1246_li
Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1240_li
@changelog_1247_li
JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1241_li
@changelog_1248_li
When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1242_li
@changelog_1249_li
Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1243_li
@changelog_1250_li
MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1244_li
@changelog_1251_li
Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1245_li
@changelog_1252_li
Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1246_li
@changelog_1253_li
Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1247_li
@changelog_1254_li
H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1248_li
@changelog_1255_li
Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1249_h2
@changelog_1256_h2
Version 1.1.112 (2009-05-01)
@changelog_1250_li
@changelog_1257_li
JdbcPreparedStatement.toString() could throw a NullPointerException.
@changelog_1251_li
@changelog_1258_li
EclipseLink: added H2Platform.supportsIdentity().
@changelog_1252_li
@changelog_1259_li
Connection pool: the default login timeout is now 5 minutes.
@changelog_1253_li
@changelog_1260_li
After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1254_li
@changelog_1261_li
More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1255_li
@changelog_1262_li
GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1256_li
@changelog_1263_li
Improved error message when the .lock.db file modification time is in the future.
@changelog_1257_li
@changelog_1264_li
The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1258_li
@changelog_1265_li
Running code coverage is now automated.
@changelog_1259_li
@changelog_1266_li
A file system implementation can now be registered using FileSystem.register.
@changelog_1260_li
@changelog_1267_li
The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1261_h2
@changelog_1268_h2
Version 1.1.111 (2009-04-10)
@changelog_1262_li
@changelog_1269_li
In-memory databases can now run inside the Google App Engine.
@changelog_1263_li
@changelog_1270_li
Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1264_li
@changelog_1271_li
The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1265_li
@changelog_1272_li
The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1266_li
@changelog_1273_li
Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1267_li
@changelog_1274_li
The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
@changelog_1268_h2
@changelog_1275_h2
Version 1.1.110 (2009-04-03)
@changelog_1269_li
@changelog_1276_li
Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1270_li
@changelog_1277_li
The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
@changelog_1271_li
@changelog_1278_li
The data type of a SUBSTRING method was wrong.
@changelog_1272_li
@changelog_1279_li
ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1273_li
@changelog_1280_li
H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1274_li
@changelog_1281_li
Improved Javadoc navigation (similar to Scaladoc).
@changelog_1275_li
@changelog_1282_li
H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1276_li
@changelog_1283_li
DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1277_li
@changelog_1284_li
The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1278_li
@changelog_1285_li
Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1279_li
@changelog_1286_li
Improved OSGi support.
@changelog_1280_li
@changelog_1287_li
Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1281_li
@changelog_1288_li
The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1282_li
@changelog_1289_li
Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1283_li
@changelog_1290_li
CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1284_li
@changelog_1291_li
DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1285_li
@changelog_1292_li
Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1286_li
@changelog_1293_li
JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1287_li
@changelog_1294_li
Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1288_li
@changelog_1295_li
The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1289_li
@changelog_1296_li
More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1290_li
@changelog_1297_li
Linked tables to SQLite database can now be created.
@changelog_1291_li
@changelog_1298_li
Nested IN(IN(...)) didn't work.
@changelog_1292_li
@changelog_1299_li
NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
@changelog_1293_h2
@changelog_1300_h2
Version 1.1.109 (2009-03-14)
@changelog_1294_li
@changelog_1301_li
The optimization for IN(...) is now only used if comparing a column with an index.
@changelog_1295_li
@changelog_1302_li
User defined functions can now be deterministic (see CREATE ALIAS documentation).
@changelog_1296_li
@changelog_1303_li
Multiple nested queries in the FROM clause with parameters did not always work.
@changelog_1297_li
@changelog_1304_li
When converting CLOB to BINARY, each character resulted in one byte. Now, the text is parsed as a hex as when converting VARCHAR.
@changelog_1298_li
@changelog_1305_li
New experimental NIO storage mechanism with both FileChannel and memory mapped files. To use it, use the file name prefix nio: or nioMapped: as in jdbc:h2:nio:~/test. So far it looks like NIO storage is faster on Mac OS but slower on some Windows systems. Thanks a lot to Jan Kotek for the patch!
@changelog_1299_li
@changelog_1306_li
The functions BITOR, BITAND, BITXOR, and MOD now accept and return BIGINT instead of INT.
@changelog_1300_li
@changelog_1307_li
Could not use the same linked table multiple times in the same query.
@changelog_1301_li
@changelog_1308_li
Bugs in the server-less multi-connection mode have been fixed.
@changelog_1302_li
@changelog_1309_li
Column names could not be named "UNIQUE" (with the quotes).
@changelog_1303_li
@changelog_1310_li
New system function TRANSACTION_ID() to get the current transaction identifier for a session.
@changelog_1304_h2
@changelog_1311_h2
Version 1.1.108 (2009-02-28)
@changelog_1305_li
@changelog_1312_li
When the shutdown hook closed the database, the last log file was deleted too early. This could cause uncommitted changes to be persisted. In some cases, this could cause data corruption.
@changelog_1306_li
@changelog_1313_li
JdbcConnectionPool: it was possible to set a negative connection pool size.
@changelog_1307_li
@changelog_1314_li
Fulltext search did not support table names with a backslash.
@changelog_1308_li
@changelog_1315_li
The internal IntArray class did not work correctly when initialized with a zero length array.
@changelog_1309_li
@changelog_1316_li
The H2 Console web application (war file) did only support ASCII characters. Now UTF-8 is supported.
@changelog_1310_li
@changelog_1317_li
DATEADD does no longer require that the argument is a timestamp.
@changelog_1311_li
@changelog_1318_li
The database file locking mechanism didn't work correctly on Mac OS.
@changelog_1312_li
@changelog_1319_li
Some built-in functions reported the wrong precision, scale, and display size.
@changelog_1313_li
@changelog_1320_li
MySQL compatibility for CREATE TABLE is improved (UNSIGNED, KEY).
@changelog_1314_li
@changelog_1321_li
Recovery did not work if there were more than 255 lobs stored as files.
@changelog_1315_li
@changelog_1322_li
New experimental mode to support multiple read-write connections without starting a server. To enable this mode, append ;FILE_LOCK=SERIALIZED;OPEN_NEW=TRUE to the database URL. Don't expect high performance when multiple concurrent writers.
@changelog_1316_li
@changelog_1323_li
In a web application, the database classes are not unloaded if a connection is open. This may cause out of memory when re-deploying a web application. The DbStarter is changed to close all connections to the configured database (by executing SHUTDOWN).
@changelog_1317_li
@changelog_1324_li
The WebServlet did not close the database when un-deploying the web application.
@changelog_1318_li
@changelog_1325_li
The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1319_li
@changelog_1326_li
If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1320_li
@changelog_1327_li
Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1321_li
@changelog_1328_li
Improved exception message when connecting to a just started server fails.
@changelog_1322_li
@changelog_1329_li
Connection.isValid is a bit faster.
@changelog_1323_li
@changelog_1330_li
H2 Console: the autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1324_li
@changelog_1331_li
When restarting a web application in Tomcat, an exception was thrown sometimes. In most cases this was a NullPointerException. A workaround in H2 has been implemented. The root cause of the problem is now documented in the FAQ: Tomcat sets all static fields (final or non-final) to null when unloading a web application. A workaround is to put the h2.jar in the lib directory, or set the system property org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES to false.
@changelog_1325_h2
@changelog_1332_h2
Version 1.1.107 (2009-01-24)
@changelog_1326_li
@changelog_1333_li
Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1327_li
@changelog_1334_li
The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1328_li
@changelog_1335_li
When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1329_li
@changelog_1336_li
In versions 1.1.105 and 1.1.106, encrypted script files of earlier versions could not be processed. This is now again possible. The problem was that such script files were stored in a special format (STORAGE=TEXT) but support for this format was removed in version 1.1.105.
@changelog_1330_li
@changelog_1337_li
Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1331_h2
@changelog_1338_h2
Version 1.1.106 (2009-01-04)
@changelog_1332_li
@changelog_1339_li
Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1333_li
@changelog_1340_li
CREATE DOMAIN: built-in data types can now only be changed if no tables exist.
@changelog_1334_li
@changelog_1341_li
Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1335_li
@changelog_1342_li
DatabaseMetaData.getPrimaryKeys: the column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1336_li
@changelog_1343_li
Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1337_li
@changelog_1344_li
Views with IN(..) that used a view itself did not work.
@changelog_1338_li
@changelog_1345_li
Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1339_li
@changelog_1346_li
The license change a bit: so far the license was modified to say 'Swiss law'. This is now changed back to the original 'US law'. This was requested by a user, and I don't see a problem.
@changelog_1340_li
@changelog_1347_li
Constraints for local temporary tables now session scoped. So far they were global. Thanks a lot to Eric Faulhaber for finding and fixing this problem!
@changelog_1341_li
@changelog_1348_li
When using the auto-server mode, and if the lock file was modified in the future, the wrong exception was thrown ('Connection is broken' instead of 'Error opening database: lock file modified in the future').
@cheatSheet_1000_h1
...
...
@@ -8336,541 +8357,541 @@ Set a connection read only (Connection.setReadOnly) or using a connection parame
Optimizer: use an index for IS NULL and IS NOT NULL (including linked tables). ID IS NOT NULL could be converted to ID >= Integer.MIN_VALUE.
@roadmap_1051_li
Suggestion: include Jetty as Servlet Container (like LAMP)
Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
@roadmap_1052_li
Trace shipping to server
Access rights: finer grained access control (grant access for specific functions)
@roadmap_1053_li
Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP)
Suggestion: include Jetty as Servlet Container (like LAMP)
@roadmap_1054_li
Web server classloader: override findResource / getResourceFrom
Trace shipping to server
@roadmap_1055_li
Cost for embedded temporary view is calculated wrong, if result is constant
Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP)
@roadmap_1056_li
Comparison: pluggable sort order: natural sort
Web server classloader: override findResource / getResourceFrom
@roadmap_1057_li
Count index range query (count(*) where id between 10 and 20)
Cost for embedded temporary view is calculated wrong, if result is constant
@roadmap_1058_li
Performance: update in-place
Comparison: pluggable sort order: natural sort
@roadmap_1059_li
Recursive Queries (see details)
Count index range query (count(*) where id between 10 and 20)
@roadmap_1060_li
Eclipse plugin
Performance: update in-place
@roadmap_1061_li
Asynchronous queries to support publish/subscribe: SELECT ... FOR READ WAIT [maxMillisToWait]
Implement missing JDBC API (CallableStatement,...)
Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
@roadmap_1067_li
Compression of the cache
iReport to support H2
@roadmap_1068_li
Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
Implement missing JDBC API (CallableStatement,...)
@roadmap_1069_li
Drop with restrict (currently cascade is the default)
Compression of the cache
@roadmap_1070_li
JSON parser and functions
Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
@roadmap_1071_li
Server: client ping from time to time (to avoid timeout - is timeout a problem?)
Drop with restrict (currently cascade is the default)
@roadmap_1072_li
Copy database: tool with config GUI and batch mode, extensible (example: compare)
JSON parser and functions
@roadmap_1073_li
Document, implement tool for long running transactions using user-defined compensation statements.
Server: client ping from time to time (to avoid timeout - is timeout a problem?)
@roadmap_1074_li
Support SET TABLE DUAL READONLY
Copy database: tool with config GUI and batch mode, extensible (example: compare)
@roadmap_1075_li
GCJ: what is the state now?
Document, implement tool for long running transactions using user-defined compensation statements.
@roadmap_1076_li
Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
Support SET TABLE DUAL READONLY
@roadmap_1077_li
Optimization: log compression
GCJ: what is the state now?
@roadmap_1078_li
ROW_NUMBER() OVER([ORDER BY columnName])
Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
@roadmap_1079_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)
Optimization: log compression
@roadmap_1080_li
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero
ROW_NUMBER() OVER([ORDER BY columnName])
@roadmap_1081_li
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
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_1082_li
Custom class loader to reload functions on demand
Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero
@roadmap_1083_li
Test http://mysql-je.sourceforge.net/
Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
@roadmap_1084_li
Close all files when closing the database (including LOB files that are open on the client side)
Custom class loader to reload functions on demand
@roadmap_1085_li
EXE file: maybe use http://jsmooth.sourceforge.net
Test http://mysql-je.sourceforge.net/
@roadmap_1086_li
Performance: automatically build in-memory indexes if the whole table is in memory
Close all files when closing the database (including LOB files that are open on the client side)
@roadmap_1087_li
H2 Console: the webclient could support more features like phpMyAdmin.
EXE file: maybe use http://jsmooth.sourceforge.net
@roadmap_1088_li
Use Janino to convert Java to C++
Performance: automatically build in-memory indexes if the whole table is in memory
@roadmap_1089_li
The HELP information schema can be directly exposed in the Console
H2 Console: the webclient could support more features like phpMyAdmin.
@roadmap_1090_li
Maybe use the 0x1234 notation for binary fields, see MS SQL Server
Use Janino to convert Java to C++
@roadmap_1091_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
The HELP information schema can be directly exposed in the Console
@roadmap_1092_li
SQL Server 2005, Oracle: support COUNT(*) OVER(). See http://www.orafusion.com/art_anlytc.htm
Maybe use the 0x1234 notation for binary fields, see MS SQL Server
Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID);
Version column (number/sequence and timestamp based)
@roadmap_1097_li
Max memory rows / max undo log size: use block count / row size not row count
Optimize getGeneratedKey: send last identity after each execute (server).
@roadmap_1098_li
Support 123L syntax as in Java; example: SELECT (2000000000*2)
Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID);
@roadmap_1099_li
Implement point-in-time recovery
Max memory rows / max undo log size: use block count / row size not row count
@roadmap_1100_li
LIKE: improved version for larger texts (currently using naive search)
Support 123L syntax as in Java; example: SELECT (2000000000*2)
@roadmap_1101_li
Automatically convert to the next 'higher' data type whenever there is an overflow.
Implement point-in-time recovery
@roadmap_1102_li
Throw an exception when the application calls getInt on a Long (optional)
LIKE: improved version for larger texts (currently using naive search)
@roadmap_1103_li
Default date format for input and output (local date constants)
Automatically convert to the next 'higher' data type whenever there is an overflow.
@roadmap_1104_li
Support custom Collators
Throw an exception when the application calls getInt on a Long (optional)
@roadmap_1105_li
Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery)
Default date format for input and output (local date constants)
@roadmap_1106_li
Clustering: when a database is back alive, automatically synchronize with the master
Support custom Collators
@roadmap_1107_li
File system that writes to two file systems (replication, replicating file system)
Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery)
@roadmap_1108_li
Standalone tool to get relevant system properties and add it to the trace output.
Clustering: when a database is back alive, automatically synchronize with the master
@roadmap_1109_li
Support 'call proc(1=value)' (PostgreSQL, Oracle)
File system that writes to two file systems (replication, replicating file system)
@roadmap_1110_li
JAMon (proxy jdbc driver)
Standalone tool to get relevant system properties and add it to the trace output.
@roadmap_1111_li
Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
Support 'call proc(1=value)' (PostgreSQL, Oracle)
@roadmap_1112_li
Console: autocomplete Ctrl+Space inserts template
JAMon (proxy jdbc driver)
@roadmap_1113_li
Option to encrypt .trace.db file
Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
@roadmap_1114_li
Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
Console: autocomplete Ctrl+Space inserts template
@roadmap_1115_li
Functions with unknown return or parameter data types: serialize / deserialize
Option to encrypt .trace.db file
@roadmap_1116_li
Test if idle TCP connections are closed, and how to disable that
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_1117_li
Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
Functions with unknown return or parameter data types: serialize / deserialize
@roadmap_1118_li
Auto-Update feature for database, .jar file
Test if idle TCP connections are closed, and how to disable that
@roadmap_1119_li
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
@roadmap_1120_li
Partial indexing (see PostgreSQL)
Auto-Update feature for database, .jar file
@roadmap_1121_li
Add GUI to build a custom version (embedded, fulltext,...) using build flags
ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
@roadmap_1122_li
http://rubyforge.org/projects/hypersonic/
Partial indexing (see PostgreSQL)
@roadmap_1123_li
Add comparator (x === y) : (x = y or (x is null and y is null))
Add GUI to build a custom version (embedded, fulltext,...) using build flags
@roadmap_1124_li
Try to create trace file even for read only databases
http://rubyforge.org/projects/hypersonic/
@roadmap_1125_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)
Add comparator (x === y) : (x = y or (x is null and y is null))
@roadmap_1126_li
Count on a column that can not be null could be optimized to COUNT(*)
Try to create trace file even for read only databases
@roadmap_1127_li
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
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_1128_li
Backup tool should work with other databases as well
Count on a column that can not be null could be optimized to COUNT(*)
@roadmap_1129_li
Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
@roadmap_1130_li
Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use)
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ..
Implement Clob / Blob truncate and the remaining functionality
@roadmap_1138_li
Add H2 to Gem (Ruby install system)
Maybe close LOBs after closing connection
@roadmap_1139_li
API for functions / user tables
Tree join functionality
@roadmap_1140_li
Order conditions inside AND / OR to optimize the performance
Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ..
@roadmap_1141_li
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER
Add H2 to Gem (Ruby install system)
@roadmap_1142_li
Support linked JCR tables
API for functions / user tables
@roadmap_1143_li
Make sure H2 is supported by Execute Query: http://executequery.org/
Order conditions inside AND / OR to optimize the performance
@roadmap_1144_li
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER
@roadmap_1145_li
Native fulltext search: min word length; store word positions
Support linked JCR tables
@roadmap_1146_li
Add an option to the SCRIPT command to generate only portable / standard SQL
Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1147_li
Test Dezign for Databases (http://www.datanamic.com)
Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1148_li
Fast library for parsing / formatting: http://javolution.org/
Native fulltext search: min word length; store word positions
@roadmap_1149_li
Updatable Views (simple cases first)
Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1150_li
Improve create index performance
Test Dezign for Databases (http://www.datanamic.com)
@roadmap_1151_li
Implement more JDBC 4.0 features
Fast library for parsing / formatting: http://javolution.org/
@roadmap_1152_li
Support TRANSFORM / PIVOT as in MS Access
Updatable Views (simple cases first)
@roadmap_1153_li
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
Improve create index performance
@roadmap_1154_li
Support updatable views with join on primary keys (to extend a table)
Implement more JDBC 4.0 features
@roadmap_1155_li
Public interface for functions (not public static)
Support TRANSFORM / PIVOT as in MS Access
@roadmap_1156_li
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1157_li
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
Support updatable views with join on primary keys (to extend a table)
@roadmap_1158_li
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
Public interface for functions (not public static)
@roadmap_1159_li
Updatable result set on table without primary key or unique index
Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1160_li
Use LinkedList instead of ArrayList where applicable
Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1161_li
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1162_li
Support % operator (modulo)
Updatable result set on table without primary key or unique index
@roadmap_1163_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
Use LinkedList instead of ArrayList where applicable
@roadmap_1164_li
Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1165_li
Support nested transactions
Support % operator (modulo)
@roadmap_1166_li
Add a benchmark for big databases, and one for many users
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_1167_li
Compression in the result set (repeating values in the same column) over TCP/IP
Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
@roadmap_1168_li
Support curtimestamp (like curtime, curdate)
Support nested transactions
@roadmap_1169_li
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
Add a benchmark for big databases, and one for many users
@roadmap_1170_li
Support Sequoia (Continuent.org)
Compression in the result set (repeating values in the same column) over TCP/IP
@roadmap_1171_li
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
Support curtimestamp (like curtime, curdate)
@roadmap_1172_li
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
Support ANALYZE {TABLE|INDEX} tableName COMPUTE|ESTIMATE|DELETE STATISTICS ptnOption options
@roadmap_1173_li
Release locks (shared or exclusive) on demand
Support Sequoia (Continuent.org)
@roadmap_1174_li
Support OUTER UNION
Dynamic length numbers / special methods for DataPage.writeByte / writeShort / Ronni Nielsen
@roadmap_1175_li
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
Pluggable ThreadPool, (AvalonDB / deebee / Paul Hammant)
@roadmap_1176_li
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
Release locks (shared or exclusive) on demand
@roadmap_1177_li
Option for SCRIPT to only process one or a set of tables, and append to a file
Support OUTER UNION
@roadmap_1178_li
Support linked tables to the current database
Support parameterized views (similar to CSVREAD, but using just SQL for the definition)
@roadmap_1179_li
Support dynamic linked schema (automatically adding/updating/removing tables)
A way (JDBC driver) to map an URL (jdbc:h2map:c1) to a connection object
@roadmap_1180_li
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
Option for SCRIPT to only process one or a set of tables, and append to a file
@roadmap_1181_li
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
Support linked tables to the current database
@roadmap_1182_li
Run benchmarks with JDK 1.5, JDK 1.6, java -server
Support dynamic linked schema (automatically adding/updating/removing tables)
@roadmap_1183_li
Optimizations: faster hash function for strings, byte arrays
Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@roadmap_1184_li
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@roadmap_1185_li
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
Run benchmarks with JDK 1.5, JDK 1.6, java -server
@roadmap_1186_li
Benchmark: add a graph to show how databases scale (performance/database size)
Optimizations: faster hash function for strings, byte arrays
@roadmap_1187_li
Implement a SQLData interface to map your data over to a custom object
DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@roadmap_1188_li
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
H2 Console / large result sets: use 'streaming' instead of building the page in-memory
@roadmap_1189_li
Support multiple directories (on different hard drives) for the same database
Benchmark: add a graph to show how databases scale (performance/database size)
@roadmap_1190_li
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
Implement a SQLData interface to map your data over to a custom object
@roadmap_1191_li
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@roadmap_1192_li
Support native XML data type
Support multiple directories (on different hard drives) for the same database
@roadmap_1193_li
Support triggers with a string property or option: SpringTrigger, OSGITrigger
Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@roadmap_1194_li
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@roadmap_1195_li
Ability to resize the cache array when resizing the cache
Support native XML data type
@roadmap_1196_li
Time based cache writing (one second after writing the log)
Support triggers with a string property or option: SpringTrigger, OSGITrigger
@roadmap_1197_li
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@roadmap_1198_li
Index usage for REGEXP LIKE.
Ability to resize the cache array when resizing the cache
@roadmap_1199_li
Compatibility: add a role DBA (like ADMIN).
Time based cache writing (one second after writing the log)
@roadmap_1200_li
Better support multiple processors for in-memory databases.
Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
@roadmap_1201_li
Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
Index usage for REGEXP LIKE.
@roadmap_1202_li
Access rights: finer grained access control (grant access for specific functions)
Compatibility: add a role DBA (like ADMIN).
@roadmap_1203_li
Support N'text'
Better support multiple processors for in-memory databases.
@roadmap_1204_li
Pure SQL triggers (example: update parent table if the child table is changed).
Support N'text'
@roadmap_1205_li
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1206_li
Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@roadmap_1207_li
Support compatibility for jdbc:hsqldb:res:
Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1208_li
Provide an Java SQL builder with standard and H2 syntax
Support compatibility for jdbc:hsqldb:res:
@roadmap_1209_li
Trace: write OS, file system, JVM,... when opening the database
Provide an Java SQL builder with standard and H2 syntax
@roadmap_1210_li
Support indexes for views (probably requires materialized views)
Trace: write OS, file system, JVM,... when opening the database
@roadmap_1211_li
Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
Support indexes for views (probably requires materialized views)
@roadmap_1212_li
Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
@roadmap_1213_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_1214_li
Support data type INTERVAL
Server: use one listener (detect if the request comes from an PG or TCP client)
@roadmap_1215_li
Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
#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_1003_li
#MVCC: if the page store is disabled, rollback of multiple rows with the same index key did not work correctly.
#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_1004_li
#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
#Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1005_li
#Slightly improved performance if the table is already locked.
#Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1006_li
#CompressLZF: faster decompression.
#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_1007_li
#If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1008_li
#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1009_li
#MVCC: if the page store is disabled, rollback of multiple rows with the same index key did not work correctly.
@changelog_1010_li
#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1011_li
#Slightly improved performance if the table is already locked.
@changelog_1012_li
#CompressLZF: faster decompression.
@changelog_1013_li
#PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1008_h2
@changelog_1014_li
#Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1015_h2
#Version 1.2.127 (2010-01-15)
@changelog_1009_li
@changelog_1016_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_1010_li
@changelog_1017_li
#Page store: new databases can not be opened with older versions.
@changelog_1011_li
@changelog_1018_li
#Page store: adding data to new database is now faster.
@changelog_1012_li
@changelog_1019_li
#File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1013_li
@changelog_1020_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_1014_li
@changelog_1021_li
#SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1015_li
@changelog_1022_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_1016_li
@changelog_1023_li
#Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1017_li
@changelog_1024_li
#If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1018_li
@changelog_1025_li
#Alter table is now supported even if a table has views defined.
@changelog_1019_li
@changelog_1026_li
#Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1020_li
@changelog_1027_li
#The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1021_li
@changelog_1028_li
#Trigger can now be called on rollback.
@changelog_1022_li
@changelog_1029_li
#The shell script h2.sh ignored command line line arguments.
@changelog_1023_li
@changelog_1030_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_1024_li
@changelog_1031_li
#The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1025_li
@changelog_1032_li
#Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1026_li
@changelog_1033_li
#The .trace.db file is now only created if required.
@changelog_1027_li
@changelog_1034_li
#Shell tool: improved PostgreSQL compatibility.
@changelog_1028_li
@changelog_1035_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_1029_li
@changelog_1036_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_1030_li
@changelog_1037_li
#Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1031_li
@changelog_1038_li
#Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1032_li
@changelog_1039_li
#CompressLZF: Faster decompress and improved javadocs
@changelog_1033_h2
@changelog_1040_h2
#Version 1.2.126 (2009-12-18)
@changelog_1034_li
@changelog_1041_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_1035_li
@changelog_1042_li
#CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1036_li
@changelog_1043_li
#Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1037_li
@changelog_1044_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_1038_li
@changelog_1045_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_1039_li
@changelog_1046_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_1040_li
@changelog_1047_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_1041_li
@changelog_1048_li
#JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1042_li
@changelog_1049_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_1043_li
@changelog_1050_li
#The reserve heap memory is no longer used.
@changelog_1044_li
@changelog_1051_li
#Database.checkpoint() could throw a NullPointerException.
@changelog_1045_h2
@changelog_1052_h2
#Version 1.2.125 (2009-12-06)
@changelog_1046_li
@changelog_1053_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_1047_li
@changelog_1054_li
#The shell tool now has a very simple statement history.
@changelog_1048_li
@changelog_1055_li
#The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1049_li
@changelog_1056_li
#Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1050_li
@changelog_1057_li
#Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1051_li
@changelog_1058_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_1052_li
@changelog_1059_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_1053_li
@changelog_1060_li
#Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1054_li
@changelog_1061_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_1055_li
@changelog_1062_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_1056_li
@changelog_1063_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_1057_li
@changelog_1064_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_1058_li
@changelog_1065_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_1059_li
@changelog_1066_li
#The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1060_li
@changelog_1067_li
#More bugs in the server-less multi-connection mode have been fixed.
@changelog_1061_li
@changelog_1068_li
#When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1062_li
@changelog_1069_li
#JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1063_li
@changelog_1070_li
#User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1064_li
@changelog_1071_li
#User defined functions with source code didn't work after re-opening the database.
@changelog_1065_li
@changelog_1072_li
#The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1066_li
@changelog_1073_li
#The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1067_li
@changelog_1074_li
#Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1068_li
@changelog_1075_li
#Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1069_h2
@changelog_1076_h2
#Version 1.2.124 (2009-11-20)
@changelog_1070_li
@changelog_1077_li
#Clustering: there is now a way to detect which cluster instances are running.
@changelog_1071_li
@changelog_1078_li
#ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1072_li
@changelog_1079_li
#The file lock thread is now stopped when the database is closed.
@changelog_1073_li
@changelog_1080_li
#Issue 140: the Script tool now supports writing to a stream.
@changelog_1074_li
@changelog_1081_li
#Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1075_li
@changelog_1082_li
#Page store: new databases can not be opened with older versions.
@changelog_1076_li
@changelog_1083_li
#Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1077_li
@changelog_1084_li
#Page store: opening a database could theoretically result in an endless loop.
@changelog_1078_li
@changelog_1085_li
#Page store: adding large indexed columns could get very slow.
@changelog_1079_li
@changelog_1086_li
#Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1080_li
@changelog_1087_li
#Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1081_li
@changelog_1088_li
#Page store: sometimes opening a read-only database failed.
@changelog_1082_li
@changelog_1089_li
#Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1083_li
@changelog_1090_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_1084_li
@changelog_1091_li
#Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1085_li
@changelog_1092_li
#Page store: improved auto-recovery after power failure.
@changelog_1086_li
@changelog_1093_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_1087_li
@changelog_1094_li
#User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1088_li
@changelog_1095_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_1089_li
@changelog_1096_li
#Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1090_li
@changelog_1097_li
#Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1091_li
@changelog_1098_li
#Improved read-only database detection.
@changelog_1092_h2
@changelog_1099_h2
#Version 1.2.123 (2009-11-08)
@changelog_1093_li
@changelog_1100_li
#Page store: new databases can not be opened with older versions.
@changelog_1094_li
@changelog_1101_li
#Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1095_li
@changelog_1102_li
#Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1096_li
@changelog_1103_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_1097_li
@changelog_1104_li
#The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1098_li
@changelog_1105_li
#The Lucene fulltext search now also returns the score.
@changelog_1099_li
@changelog_1106_li
# New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1100_li
@changelog_1107_li
#Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1101_li
@changelog_1108_li
#Improved error messages: identifiers and values are now quoted.
@changelog_1102_li
@changelog_1109_li
#Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1103_li
@changelog_1110_li
#Improved support for GAE for Java thanks to Vince Bonfanti.
@changelog_1104_h2
@changelog_1111_h2
#Version 1.2.122 (2009-10-28)
@changelog_1105_li
@changelog_1112_li
#The native fulltext search now supports streaming CLOB data.
@changelog_1106_li
@changelog_1113_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_1107_li
@changelog_1114_li
#Dropping the current user is now allowed if another admin user exists.
@changelog_1108_li
@changelog_1115_li
#Values of type BINARY or BLOB could not be converted to the data type OTHER.
@changelog_1109_li
@changelog_1116_li
#SHUTDOWN COMPACT now fully compacts the database.
@changelog_1110_li
@changelog_1117_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_1111_li
@changelog_1118_li
#New sorted insert optimization (see Performance / Database Performance Tuning).
@changelog_1112_li
@changelog_1119_li
#Issue 116: The files h2*-sources.jar and h2*-javadoc.jar are now in the Maven repository.
@changelog_1113_li
@changelog_1120_li
#Page store: opening a large database was slow if it was not closed before.
@changelog_1114_li
@changelog_1121_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_1115_li
@changelog_1122_li
#The SQL syntax is documented using (railroad) diagrams. The diagrams are HTML.
@changelog_1116_li
@changelog_1123_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_1117_li
@changelog_1124_li
#Certain queries were not sorted if subselect queries were involved
@changelog_1118_li
@changelog_1125_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_1119_h2
@changelog_1126_h2
#Version 1.2.121 (2009-10-11)
@changelog_1120_li
@changelog_1127_li
#Better support GaeVFS (Google App Engine Virtual File System) thanks to Thanks to Vince Bonfanti.
@changelog_1121_li
@changelog_1128_li
#CSVREAD didn't close the file. Thanks to Vince Bonfanti for the patch!
@changelog_1122_li
@changelog_1129_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_1123_li
@changelog_1130_li
#Page store bugs were fixed. Large values in indexed columns could corrupt the index.
@changelog_1124_li
@changelog_1131_li
#The page store did not work when using Retrotranslator (because the Retrotranslator doesn't support Integer.reverse and Long.reverse).
@changelog_1125_li
@changelog_1132_li
#New system property h2.pageStoreTrim to disable shrinking the database when closing (disabled by default, meaning by default the database is trimmed).
@changelog_1126_h2
@changelog_1133_h2
#Version 1.2.120 (2009-10-04)
@changelog_1127_li
@changelog_1134_li
#This is a beta version.
@changelog_1128_li
@changelog_1135_li
#Large updates could throw an ArrayIndexOutOfBoundsException in RowList.writeRow.
@changelog_1129_li
@changelog_1136_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_1130_li
@changelog_1137_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_1131_li
@changelog_1138_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_1132_li
@changelog_1139_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_1133_li
@changelog_1140_li
#PostgreSQL compatibility: function LASTVAL() as an alias for IDENTITY().
@changelog_1134_li
@changelog_1141_li
#Linked tables now support default values when inserting, updating or merging.
@changelog_1135_li
@changelog_1142_li
#Bugfixes in the page store.
@changelog_1136_li
@changelog_1143_li
#Possibility to set a vendor id in Constants.java, so that unofficial builds are distinguishable from official releases.
@changelog_1137_li
@changelog_1144_li
#Allow writing to linked tables in readonly databases.
@changelog_1138_h2
@changelog_1145_h2
#Version 1.1.119 (2009-09-26)
@changelog_1139_li
@changelog_1146_li
#SQL statements in the exception message are no longer included if they contain '--hide--'.
@changelog_1140_li
@changelog_1147_li
#Temporary local tables did not always work after reconnect if AUTO_SERVER=TRUE
@changelog_1141_li
@changelog_1148_li
#New system property h2.defaultMaxLengthInplaceLob to change the default maximum size of an in-place LOB object.
@changelog_1142_li
@changelog_1149_li
#New system property h2.nullConcatIsNull to change the default null concatenation behavior. The default will be enabled in version 1.2.
@changelog_1143_li
@changelog_1150_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_1144_li
@changelog_1151_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_1145_li
@changelog_1152_li
#ChangeFileEncryption did not work with Lob subdirectories. Fixed.
@changelog_1146_li
@changelog_1153_li
#Issue 121: JaQu: new simple update and merge methods.
@changelog_1147_li
@changelog_1154_li
#Issue 120: JaQu didn't close result sets.
@changelog_1148_li
@changelog_1155_li
#Issue 119: JaQu creates wrong WHERE conditions on some inputs.
@changelog_1149_li
@changelog_1156_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_1150_li
@changelog_1157_li
#SELECT COUNT(*) FROM SYSTEM_RANGE(...) returned the wrong result. Fixed.
@changelog_1151_li
@changelog_1158_li
#The Recover tool now also processes the log files, however applying those changes is still a manual process.
@changelog_1152_li
@changelog_1159_li
#New sample application that shows how to pass data to a trigger.
@changelog_1153_li
@changelog_1160_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_1154_li
@changelog_1161_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_1155_li
@changelog_1162_li
#Updating many rows with the same CLOB or BLOB values could result in FileNotFoundException.
@changelog_1156_li
@changelog_1163_li
#Statement.getConnection() threw an exception if the connection was already closed.
@changelog_1157_li
@changelog_1164_li
#The native fulltext index kept a reference to a database after the database was closed.
@changelog_1158_li
@changelog_1165_li
#Non-unique in-memory hash indexes are now supported. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1159_li
@changelog_1166_li
#The optimizer does a better job for joins if indexes are missing.
@changelog_1160_h2
@changelog_1167_h2
#Version 1.1.118 (2009-09-04)
@changelog_1161_li
@changelog_1168_li
#SHOW COLUMNS only listed indexed columns.
@changelog_1162_li
@changelog_1169_li
#When calling SHUTDOWN IMMEDIATELY in the server mode, the .trace.db file was not closed.
@changelog_1163_li
@changelog_1170_li
#DatabaseMetaData.getPrimaryKeys: the wrong constraint name was reported if there was another constraint on the same table and columns.
@changelog_1164_li
@changelog_1171_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_1165_li
@changelog_1172_li
#Native fulltext search: before searching, FT_INIT() had to be called. This is no longer required.
@changelog_1166_li
@changelog_1173_li
#Better support GaeVFS (Google App Engine Virtual File System).
@changelog_1167_li
@changelog_1174_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_1168_li
@changelog_1175_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1169_li
@changelog_1176_li
#PreparedStatement.setObject now converts a java.lang.Character to a string.
@changelog_1170_li
@changelog_1177_li
#H2 Console: PierPaolo Ucchino has completed the Italian translation. Thanks a lot!
@changelog_1171_li
@changelog_1178_li
#Various tools now use Java 5 var-args, such as main the methods and SimpleResultSet.addRow.
@changelog_1172_li
@changelog_1179_li
#H2 Console: indexes of tables of non-default schemas are now also listed.
@changelog_1173_li
@changelog_1180_li
#Issue 111: Multi-version concurrency / duplicate primary key after rollback.
@changelog_1174_li
@changelog_1181_li
#Issue 110: Multi-version concurrency / wrong exception is thrown.
@changelog_1175_li
@changelog_1182_li
#Parser: sequenceName.NEXTVAL and CURRVAL did not respect the schema search path.
@changelog_1176_li
@changelog_1183_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_1177_li
@changelog_1184_li
#The stack trace of very common exceptions is no longer written to the .trace.db file by default.
@changelog_1178_li
@changelog_1185_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_1179_li
@changelog_1186_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_1180_h2
@changelog_1187_h2
#Version 1.1.117 (2009-08-09)
@changelog_1181_li
@changelog_1188_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_1182_li
@changelog_1189_li
#JaQu: the order of the fields in the database no longer needs to match the order in the database.
@changelog_1183_li
@changelog_1190_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_1184_li
@changelog_1191_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_1185_li
@changelog_1192_li
#Views using functions were not re-evaluated when necessary.
@changelog_1186_li
@changelog_1193_li
#Improved MySQL compatibility for SHOW COLUMNS.
@changelog_1187_li
@changelog_1194_li
#Improved PostgreSQL compatibility for timestamp literals with timezone.
@changelog_1188_li
@changelog_1195_li
#Sergi Vladykin translated the error messages to Russian. Thanks a lot!
@changelog_1189_li
@changelog_1196_li
#Support for Java 6 DatabaseMetaData.getTables, getColumns, getProcedures, and getProcedureColumns.
@changelog_1190_li
@changelog_1197_li
#Issue 101: Rollback of a large transaction (more than 100000 rows) could fail.
@changelog_1191_li
@changelog_1198_li
#Various bugfixes and improvements in the page store mechanism (still experimental).
@changelog_1192_li
@changelog_1199_li
#The functions LENGTH, OCTET_LENGTH, and BIT_LENGTH now return BIGINT.
@changelog_1193_li
@changelog_1200_li
#Data types CLOB and BLOB: the maximum precision was Integer.MAX_VALUE, it is now Long.MAX_VALUE.
@changelog_1194_li
@changelog_1201_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_1195_li
@changelog_1202_li
#Parsing SQL script files is now faster.
@changelog_1196_li
@changelog_1203_li
#CSV reading is now faster.
@changelog_1197_li
@changelog_1204_li
#SimpleResultSet.newInstance(SimpleRowSource rs) did not work.
@changelog_1198_h2
@changelog_1205_h2
#Version 1.1.116 (2009-07-18)
@changelog_1199_li
@changelog_1206_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1200_li
@changelog_1207_li
#The built-in help (INFORMATION_SCHEMA.HELP) is smaller, shrinking the jar file size a bit.
@changelog_1201_li
@changelog_1208_li
#H2 Console: column of tables of non-default schemas are now also listed, except for schemas starting with 'INFO'.
@changelog_1202_li
@changelog_1209_li
#ALTER TABLE: removing an auto-increment or identity column didn't remove the sequence.
@changelog_1203_li
@changelog_1210_li
#Creating indexes is now a bit faster.
@changelog_1204_li
@changelog_1211_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_1205_li
@changelog_1212_li
#PG Server: improved compatibility by using the type ids of the PostgreSQL driver. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1206_li
@changelog_1213_li
#H2 Console: Oracle system tables are no longer listed, improving performance.
@changelog_1207_li
@changelog_1214_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_1208_li
@changelog_1215_li
#New system property h2.defaultResultSetConcurrency to change the default result set concurrency.
@changelog_1209_li
@changelog_1216_li
#JDBC: using an invalid result set type or concurrency now throws an exception.
@changelog_1210_li
@changelog_1217_li
#If a pooled connection was not closed but garbage collected, a NullPointerException could occur.
@changelog_1211_li
@changelog_1218_li
#Fulltext search: a NullPointerException was thrown when updating a value that was NULL previously.
@changelog_1212_li
@changelog_1219_li
#The Recover tool did not work with .data.db files of the wrong size.
@changelog_1213_li
@changelog_1220_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_1214_li
@changelog_1221_li
#The soft-references cache (CACHE_TYPE=SOFT_LRU) could throw a NullPointerException.
@changelog_1215_li
@changelog_1222_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_1216_h2
@changelog_1223_h2
#Version 1.1.115 (2009-06-21)
@changelog_1217_li
@changelog_1224_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_1218_li
@changelog_1225_li
#ALTER TABLE could throw an exception "object already exists" in some cases.
@changelog_1219_li
@changelog_1226_li
#Views: in some situations, an ArrayIndexOutOfBoundsException was thrown when using the same view concurrently.
@changelog_1220_li
@changelog_1227_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_1221_li
@changelog_1228_li
#H2 Console: the language was reset to the browser language when disconnecting.
@changelog_1222_li
@changelog_1229_li
#H2 Console: improved Polish translation.
@changelog_1223_li
@changelog_1230_li
#Server-less multi-connection mode: more bugs are fixed.
@changelog_1224_li
@changelog_1231_li
#The download page now included the SHA1 checksums.
@changelog_1225_li
@changelog_1232_li
#Shell tool: the file encoding workaround is now documented if you run java org.h2.tools.Shell -?.
@changelog_1226_li
@changelog_1233_li
#The RunScript tool and SQL statement did not work with the compression method LZF.
@changelog_1227_li
@changelog_1234_li
#Fulltext search: searching for NULL or an empty string threw an exception.
@changelog_1228_li
@changelog_1235_li
#Lucene fulltext search: FTL_DROP_ALL did not drop the triggers.
@changelog_1229_li
@changelog_1236_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_1230_li
@changelog_1237_li
#Data types: LONG is now an alias for BIGINT.
@changelog_1231_h2
@changelog_1238_h2
#Version 1.1.114 (2009-06-01)
@changelog_1232_li
@changelog_1239_li
#ResultSetMetaData.getColumnClassName returned the wrong class for CLOB and BLOB columns.
@changelog_1233_li
@changelog_1240_li
#Fulltext search: data is no longer deleted and re-inserted if the indexed columns didn't change.
@changelog_1234_li
@changelog_1241_li
#In some situations, an ArrayIndexOutOfBoundsException was thrown when adding rows. This was caused by a bug in the b-tree code.
@changelog_1235_li
@changelog_1242_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_1236_li
@changelog_1243_li
#The Recover tool did not always work when the database contains referential integrity constraints.
@changelog_1237_li
@changelog_1244_li
#Java 1.5 is now required to run H2. If required, Retrotranslator can be used to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1238_h2
@changelog_1245_h2
#Version 1.1.113 (2009-05-21)
@changelog_1239_li
@changelog_1246_li
#Shell tool: the built-in commands EXIT, HELP, ?, LIST, and so on didn't work with a semicolon at the end.
@changelog_1240_li
@changelog_1247_li
#JDK 1.5 is now required to build the jar file. However it is still possible to create a jar file for Java 1.4. For details, see buildRelease.sh and buildRelease.bat. As an alternative, compile using JDK 1.5 or 1.6 and use Retrotranslator to create a Java 1.4 version (http://retrotranslator.sourceforge.net/).
@changelog_1241_li
@changelog_1248_li
#When deleting or updating many rows in a table, the space in the index file was not re-used in the default mode (persistent database, b-tree index, LOG=1). This caused the index file to grow over time. Workarounds were to delete and re-created the index file, alter the table (add a remove a column), or append ;LOG=2 to the database URL. To disable the change, set the system property h2.reuseSpaceBtreeIndex to false.
@changelog_1242_li
@changelog_1249_li
#Identifiers with a digit and then a dollar sign didn't work. Example: A1$B.
@changelog_1243_li
@changelog_1250_li
#MS SQL Server compatibility: support for linked tables with NVARCHAR, NCHAR, NCLOB, and LONGNVARCHAR.
@changelog_1244_li
@changelog_1251_li
#Android: workaround for a problem when using read-only databases in zip files (skip seems to be implemented incorrectly on the Android system).
@changelog_1245_li
@changelog_1252_li
#Calling execute() or prepareStatement() with null as the SQL statement now throws an exception.
@changelog_1246_li
@changelog_1253_li
#Benchmark: the number of executed statements was incorrect. The H2 database was loaded at the beginning of the test to collect results, now it is loaded at the very end. Thanks to Fred Toussi from HSQLDB for reporting those problems. However the changed do not affect the relative performance.
@changelog_1247_li
@changelog_1254_li
#H2 Console: command line settings are no longer stored in the properties file. They are now only used for the current process, except if they are explicitly saved.
@changelog_1248_li
@changelog_1255_li
#Cache: support for a second level soft-references cache. To enable it, append ;CACHE_TYPE=SOFT_LRU (or SOFT_TQ) to the database URL, or set the system property h2.cacheTypeDefault to "SOFT_LRU" / "SOFT_TQ". Enabling the second level cache reduces performance for small databases, but speeds up large databases. It makes sense to use it if the available memory size is unknown. Thanks a lot to Jan Kotek!
@changelog_1249_h2
@changelog_1256_h2
#Version 1.1.112 (2009-05-01)
@changelog_1250_li
@changelog_1257_li
#JdbcPreparedStatement.toString() could throw a NullPointerException.
#Connection pool: the default login timeout is now 5 minutes.
@changelog_1253_li
@changelog_1260_li
#After truncating tables, opening large databases could become slow because indexes were always re-built unnecessarily when opening.
@changelog_1254_li
@changelog_1261_li
#More bugs in the server-less multi-connection mode have been fixed: Sometimes parameters of prepared statements were lost when a reconnecting. Concurrent read operations were slow. To improve performance, executeQuery(..) must be used for queries (execute(..) switches to the write mode, which is slow).
@changelog_1255_li
@changelog_1262_li
#GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.
@changelog_1256_li
@changelog_1263_li
#Improved error message when the .lock.db file modification time is in the future.
@changelog_1257_li
@changelog_1264_li
#The MERGE statement now returns 0 as the generated key if the row was updated.
@changelog_1258_li
@changelog_1265_li
#Running code coverage is now automated.
@changelog_1259_li
@changelog_1266_li
#A file system implementation can now be registered using FileSystem.register.
@changelog_1260_li
@changelog_1267_li
#The database file system is no longer included in the jar file, it moved to the test section.
@changelog_1261_h2
@changelog_1268_h2
#Version 1.1.111 (2009-04-10)
@changelog_1262_li
@changelog_1269_li
#In-memory databases can now run inside the Google App Engine.
@changelog_1263_li
@changelog_1270_li
#Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).
@changelog_1264_li
@changelog_1271_li
#The wrong exception was thrown when using unquoted text for the SQL statements COMMENT, ALTER USER, and SET PASSWORD.
@changelog_1265_li
@changelog_1272_li
#The built-in connection pool did not roll back transactions and enable autocommit enabled after closing a connection.
@changelog_1266_li
@changelog_1273_li
#Sometimes a StackOverflow occurred when checking for deadlock. See also http://code.google.com/p/h2database/issues/detail?id=61
@changelog_1267_li
@changelog_1274_li
#The Shell tool no longer truncates results with only one column, and displays a message if data was truncated.
@changelog_1268_h2
@changelog_1275_h2
#Version 1.1.110 (2009-04-03)
@changelog_1269_li
@changelog_1276_li
#Support for not persistent in-memory tables in regular (persistent) databases using CREATE MEMORY TABLE(..) NOT PERSISTENT. Thanks a lot to Sergi Vladykin for the patch!
@changelog_1270_li
@changelog_1277_li
#The H2 Console trimmed the password (removed leading and trailing spaces). This is no longer the case, to support encrypted H2 database with an empty user password.
@changelog_1271_li
@changelog_1278_li
#The data type of a SUBSTRING method was wrong.
@changelog_1272_li
@changelog_1279_li
#ResultSet.findColumn and get methods with column label parameters now also check for matching column names (like most databases except MySQL).
@changelog_1273_li
@changelog_1280_li
#H2 Console: the browser system property now supports a list of arguments. Example: java -Dh2.browser="open,-a,Safari,%url" ...
@changelog_1274_li
@changelog_1281_li
#Improved Javadoc navigation (similar to Scaladoc).
@changelog_1275_li
@changelog_1282_li
#H2 Console: auto-complete of identifiers did not work correctly for H2 databases in MySQL mode.
@changelog_1276_li
@changelog_1283_li
#DISTINCT and GROUP BY on a CLOB column was broken.
@changelog_1277_li
@changelog_1284_li
#The FTP server moved to the tools section and is no longer included in the h2*.jar file.
@changelog_1278_li
@changelog_1285_li
#Improved error message for unsupported features: now the message says what exactly is not supported.
@changelog_1279_li
@changelog_1286_li
#Improved OSGi support.
@changelog_1280_li
@changelog_1287_li
#Some internal caches did not use the LRU mechanism. Fixed (LOB file list, optimizer cost cache, trace system, view indexes, collection keys, compressed in-memory file system).
@changelog_1281_li
@changelog_1288_li
#The API of the tools changed a bit (each tool now returns an exit code).
@changelog_1282_li
@changelog_1289_li
#Command line help of the tools now match the javadocs. The build converts the javadocs to a resource that is read by the tool at runtime. This should not have an effect on using the database, but it reduces duplicate and out-of-sync documentation.
@changelog_1283_li
@changelog_1290_li
#CREATE TABLE: improved compatibility (support for UNIQUE NOT NULL).
@changelog_1284_li
@changelog_1291_li
#DatabaseMetaData.getSQLKeywords now returns the correct list.
@changelog_1285_li
@changelog_1292_li
#Deterministic user defined functions did not work when the parameter was a column. Fixed.
@changelog_1286_li
@changelog_1293_li
#JdbcConnectionPool.setLoginTimeout with 0 now uses the default timeout.
@changelog_1287_li
@changelog_1294_li
#Creating a JdbcConnectionPool has been simplified a bit.
@changelog_1288_li
@changelog_1295_li
#The built-in connection pool did not re-use connections. Getting a connection using the built-in JdbcConnectionPool is now about 70 times faster than opening connections using DriverManager.getConnection.
@changelog_1289_li
@changelog_1296_li
#More bugs in the server-less multi-connection mode have been fixed: If a process terminated while writing, other open connections were blocked. If two processes were writing to the database, sometimes the database was corrupt after closing.
@changelog_1290_li
@changelog_1297_li
#Linked tables to SQLite database can now be created.
@changelog_1291_li
@changelog_1298_li
#Nested IN(IN(...)) didn't work.
@changelog_1292_li
@changelog_1299_li
#NIO storage: the nio: prefix was using memory mapped files instead of FileChannel.
@changelog_1293_h2
@changelog_1300_h2
#Version 1.1.109 (2009-03-14)
@changelog_1294_li
@changelog_1301_li
#The optimization for IN(...) is now only used if comparing a column with an index.
@changelog_1295_li
@changelog_1302_li
#User defined functions can now be deterministic (see CREATE ALIAS documentation).
@changelog_1296_li
@changelog_1303_li
#Multiple nested queries in the FROM clause with parameters did not always work.
@changelog_1297_li
@changelog_1304_li
#When converting CLOB to BINARY, each character resulted in one byte. Now, the text is parsed as a hex as when converting VARCHAR.
@changelog_1298_li
@changelog_1305_li
#New experimental NIO storage mechanism with both FileChannel and memory mapped files. To use it, use the file name prefix nio: or nioMapped: as in jdbc:h2:nio:~/test. So far it looks like NIO storage is faster on Mac OS but slower on some Windows systems. Thanks a lot to Jan Kotek for the patch!
@changelog_1299_li
@changelog_1306_li
#The functions BITOR, BITAND, BITXOR, and MOD now accept and return BIGINT instead of INT.
@changelog_1300_li
@changelog_1307_li
#Could not use the same linked table multiple times in the same query.
@changelog_1301_li
@changelog_1308_li
#Bugs in the server-less multi-connection mode have been fixed.
@changelog_1302_li
@changelog_1309_li
#Column names could not be named "UNIQUE" (with the quotes).
@changelog_1303_li
@changelog_1310_li
#New system function TRANSACTION_ID() to get the current transaction identifier for a session.
@changelog_1304_h2
@changelog_1311_h2
#Version 1.1.108 (2009-02-28)
@changelog_1305_li
@changelog_1312_li
#When the shutdown hook closed the database, the last log file was deleted too early. This could cause uncommitted changes to be persisted. In some cases, this could cause data corruption.
@changelog_1306_li
@changelog_1313_li
#JdbcConnectionPool: it was possible to set a negative connection pool size.
@changelog_1307_li
@changelog_1314_li
#Fulltext search did not support table names with a backslash.
@changelog_1308_li
@changelog_1315_li
#The internal IntArray class did not work correctly when initialized with a zero length array.
@changelog_1309_li
@changelog_1316_li
#The H2 Console web application (war file) did only support ASCII characters. Now UTF-8 is supported.
@changelog_1310_li
@changelog_1317_li
#DATEADD does no longer require that the argument is a timestamp.
@changelog_1311_li
@changelog_1318_li
#The database file locking mechanism didn't work correctly on Mac OS.
@changelog_1312_li
@changelog_1319_li
#Some built-in functions reported the wrong precision, scale, and display size.
@changelog_1313_li
@changelog_1320_li
#MySQL compatibility for CREATE TABLE is improved (UNSIGNED, KEY).
@changelog_1314_li
@changelog_1321_li
#Recovery did not work if there were more than 255 lobs stored as files.
@changelog_1315_li
@changelog_1322_li
#New experimental mode to support multiple read-write connections without starting a server. To enable this mode, append ;FILE_LOCK=SERIALIZED;OPEN_NEW=TRUE to the database URL. Don't expect high performance when multiple concurrent writers.
@changelog_1316_li
@changelog_1323_li
#In a web application, the database classes are not unloaded if a connection is open. This may cause out of memory when re-deploying a web application. The DbStarter is changed to close all connections to the configured database (by executing SHUTDOWN).
@changelog_1317_li
@changelog_1324_li
#The WebServlet did not close the database when un-deploying the web application.
@changelog_1318_li
@changelog_1325_li
#The exception message of failed INSERT or MERGE statements now includes all values and the row number.
@changelog_1319_li
@changelog_1326_li
#If opening a database failed with an out of memory exception, some files were not closed.
@changelog_1320_li
@changelog_1327_li
#Optimizer: the expected runtime calculation was incorrect. The fixed calculation should give slightly better query plans when using many joins.
@changelog_1321_li
@changelog_1328_li
#Improved exception message when connecting to a just started server fails.
@changelog_1322_li
@changelog_1329_li
#Connection.isValid is a bit faster.
@changelog_1323_li
@changelog_1330_li
#H2 Console: the autocomplete feature has been improved a bit. It can now better parse conditions.
@changelog_1324_li
@changelog_1331_li
#When restarting a web application in Tomcat, an exception was thrown sometimes. In most cases this was a NullPointerException. A workaround in H2 has been implemented. The root cause of the problem is now documented in the FAQ: Tomcat sets all static fields (final or non-final) to null when unloading a web application. A workaround is to put the h2.jar in the lib directory, or set the system property org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES to false.
@changelog_1325_h2
@changelog_1332_h2
#Version 1.1.107 (2009-01-24)
@changelog_1326_li
@changelog_1333_li
#Some DatabaseMetaData operations did not work for non-admin users for versions 1.1.x.
@changelog_1327_li
@changelog_1334_li
#The MySQL compatibility extension fromUnixTime now used the English locale.
@changelog_1328_li
@changelog_1335_li
#When using LOG=2 and repeatedly updating the last row rows of a table, the index file grew quickly.
@changelog_1329_li
@changelog_1336_li
#In versions 1.1.105 and 1.1.106, encrypted script files of earlier versions could not be processed. This is now again possible. The problem was that such script files were stored in a special format (STORAGE=TEXT) but support for this format was removed in version 1.1.105.
@changelog_1330_li
@changelog_1337_li
#Enabling the trace mechanism by creating a specially named file is no longer supported.
@changelog_1331_h2
@changelog_1338_h2
#Version 1.1.106 (2009-01-04)
@changelog_1332_li
@changelog_1339_li
#Statement.setQueryTimeout did not work correctly for some statements.
@changelog_1333_li
@changelog_1340_li
#CREATE DOMAIN: built-in data types can now only be changed if no tables exist.
@changelog_1334_li
@changelog_1341_li
#Linked tables: a workaround for Oracle DATE columns has been implemented.
@changelog_1335_li
@changelog_1342_li
#DatabaseMetaData.getPrimaryKeys: the column PK_NAME now contains the constraint name instead of the index name (compatibility for PostgreSQL and Derby).
@changelog_1336_li
@changelog_1343_li
#Using IN(..) inside a IN(SELECT..) did not always work.
@changelog_1337_li
@changelog_1344_li
#Views with IN(..) that used a view itself did not work.
@changelog_1338_li
@changelog_1345_li
#Union queries with LIMIT or ORDER BY that are used in a view or subquery did not work.
@changelog_1339_li
@changelog_1346_li
#The license change a bit: so far the license was modified to say 'Swiss law'. This is now changed back to the original 'US law'. This was requested by a user, and I don't see a problem.
@changelog_1340_li
@changelog_1347_li
#Constraints for local temporary tables now session scoped. So far they were global. Thanks a lot to Eric Faulhaber for finding and fixing this problem!
@changelog_1341_li
@changelog_1348_li
#When using the auto-server mode, and if the lock file was modified in the future, the wrong exception was thrown ('Connection is broken' instead of 'Error opening database: lock file modified in the future').
@cheatSheet_1000_h1
...
...
@@ -8336,541 +8357,541 @@ H2 コンソール アプリケーション
#Optimizer: use an index for IS NULL and IS NOT NULL (including linked tables). ID IS NOT NULL could be converted to ID >= Integer.MIN_VALUE.
@roadmap_1051_li
#Suggestion: include Jetty as Servlet Container (like LAMP)
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
@roadmap_1052_li
#Trace shipping to server
#Access rights: finer grained access control (grant access for specific functions)
@roadmap_1053_li
#Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP)
#Suggestion: include Jetty as Servlet Container (like LAMP)
@roadmap_1054_li
#Web server classloader: override findResource / getResourceFrom
#Trace shipping to server
@roadmap_1055_li
#Cost for embedded temporary view is calculated wrong, if result is constant
#Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP)
@roadmap_1056_li
#Comparison: pluggable sort order: natural sort
#Web server classloader: override findResource / getResourceFrom
@roadmap_1057_li
#Count index range query (count(*) where id between 10 and 20)
#Cost for embedded temporary view is calculated wrong, if result is constant
@roadmap_1058_li
#Performance: update in-place
#Comparison: pluggable sort order: natural sort
@roadmap_1059_li
#Recursive Queries (see details)
#Count index range query (count(*) where id between 10 and 20)
@roadmap_1060_li
#Eclipse plugin
#Performance: update in-place
@roadmap_1061_li
#Asynchronous queries to support publish/subscribe: SELECT ... FOR READ WAIT [maxMillisToWait]
#Implement missing JDBC API (CallableStatement,...)
#Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
@roadmap_1067_li
#Compression of the cache
#iReport to support H2
@roadmap_1068_li
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
#Implement missing JDBC API (CallableStatement,...)
@roadmap_1069_li
#Drop with restrict (currently cascade is the default)
#Compression of the cache
@roadmap_1070_li
#JSON parser and functions
#Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
@roadmap_1071_li
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
#Drop with restrict (currently cascade is the default)
@roadmap_1072_li
#Copy database: tool with config GUI and batch mode, extensible (example: compare)
#JSON parser and functions
@roadmap_1073_li
#Document, implement tool for long running transactions using user-defined compensation statements.
#Server: client ping from time to time (to avoid timeout - is timeout a problem?)
@roadmap_1074_li
#Support SET TABLE DUAL READONLY
#Copy database: tool with config GUI and batch mode, extensible (example: compare)
@roadmap_1075_li
#GCJ: what is the state now?
#Document, implement tool for long running transactions using user-defined compensation statements.
@roadmap_1076_li
#Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
#Support SET TABLE DUAL READONLY
@roadmap_1077_li
#Optimization: log compression
#GCJ: what is the state now?
@roadmap_1078_li
#ROW_NUMBER() OVER([ORDER BY columnName])
#Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
@roadmap_1079_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)
#Optimization: log compression
@roadmap_1080_li
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero
#ROW_NUMBER() OVER([ORDER BY columnName])
@roadmap_1081_li
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
#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_1082_li
#Custom class loader to reload functions on demand
#Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero
@roadmap_1083_li
#Test http://mysql-je.sourceforge.net/
#Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
@roadmap_1084_li
#Close all files when closing the database (including LOB files that are open on the client side)
#Custom class loader to reload functions on demand
@roadmap_1085_li
#EXE file: maybe use http://jsmooth.sourceforge.net
#Test http://mysql-je.sourceforge.net/
@roadmap_1086_li
#Performance: automatically build in-memory indexes if the whole table is in memory
#Close all files when closing the database (including LOB files that are open on the client side)
@roadmap_1087_li
#H2 Console: the webclient could support more features like phpMyAdmin.
#EXE file: maybe use http://jsmooth.sourceforge.net
@roadmap_1088_li
#Use Janino to convert Java to C++
#Performance: automatically build in-memory indexes if the whole table is in memory
@roadmap_1089_li
#The HELP information schema can be directly exposed in the Console
#H2 Console: the webclient could support more features like phpMyAdmin.
@roadmap_1090_li
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
#Use Janino to convert Java to C++
@roadmap_1091_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
#The HELP information schema can be directly exposed in the Console
@roadmap_1092_li
#SQL Server 2005, Oracle: support COUNT(*) OVER(). See http://www.orafusion.com/art_anlytc.htm
#Maybe use the 0x1234 notation for binary fields, see MS SQL Server
#Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
@roadmap_1114_li
#Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
#Functions with unknown return or parameter data types: serialize / deserialize
#Option to encrypt .trace.db file
@roadmap_1116_li
#Test if idle TCP connections are closed, and how to disable that
#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_1117_li
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
#Functions with unknown return or parameter data types: serialize / deserialize
@roadmap_1118_li
#Auto-Update feature for database, .jar file
#Test if idle TCP connections are closed, and how to disable that
@roadmap_1119_li
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
#Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
@roadmap_1120_li
#Partial indexing (see PostgreSQL)
#Auto-Update feature for database, .jar file
@roadmap_1121_li
#Add GUI to build a custom version (embedded, fulltext,...) using build flags
#ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
@roadmap_1122_li
#http://rubyforge.org/projects/hypersonic/
#Partial indexing (see PostgreSQL)
@roadmap_1123_li
#Add comparator (x === y) : (x = y or (x is null and y is null))
#Add GUI to build a custom version (embedded, fulltext,...) using build flags
@roadmap_1124_li
#Try to create trace file even for read only databases
#http://rubyforge.org/projects/hypersonic/
@roadmap_1125_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)
#Add comparator (x === y) : (x = y or (x is null and y is null))
@roadmap_1126_li
#Count on a column that can not be null could be optimized to COUNT(*)
#Try to create trace file even for read only databases
@roadmap_1127_li
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
#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_1128_li
#Backup tool should work with other databases as well
#Count on a column that can not be null could be optimized to COUNT(*)
@roadmap_1129_li
#Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
#Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
@roadmap_1130_li
#Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
#Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use)
#Native fulltext search: min word length; store word positions
#Support linked JCR tables
@roadmap_1146_li
#Add an option to the SCRIPT command to generate only portable / standard SQL
#Make sure H2 is supported by Execute Query: http://executequery.org/
@roadmap_1147_li
#Test Dezign for Databases (http://www.datanamic.com)
#Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
@roadmap_1148_li
#Fast library for parsing / formatting: http://javolution.org/
#Native fulltext search: min word length; store word positions
@roadmap_1149_li
#Updatable Views (simple cases first)
#Add an option to the SCRIPT command to generate only portable / standard SQL
@roadmap_1150_li
#Improve create index performance
#Test Dezign for Databases (http://www.datanamic.com)
@roadmap_1151_li
#Implement more JDBC 4.0 features
#Fast library for parsing / formatting: http://javolution.org/
@roadmap_1152_li
#Support TRANSFORM / PIVOT as in MS Access
#Updatable Views (simple cases first)
@roadmap_1153_li
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
#Improve create index performance
@roadmap_1154_li
#Support updatable views with join on primary keys (to extend a table)
#Implement more JDBC 4.0 features
@roadmap_1155_li
#Public interface for functions (not public static)
#Support TRANSFORM / PIVOT as in MS Access
@roadmap_1156_li
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
#SELECT * FROM (VALUES (...), (...), ....) AS alias(f1, ...)
@roadmap_1157_li
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
#Support updatable views with join on primary keys (to extend a table)
@roadmap_1158_li
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
#Public interface for functions (not public static)
@roadmap_1159_li
#Updatable result set on table without primary key or unique index
#Autocomplete: if I type the name of a table that does not exist (should say: syntax not supported)
@roadmap_1160_li
#Use LinkedList instead of ArrayList where applicable
#Eliminate undo log records if stored on disk (just one pointer per block, not per record)
@roadmap_1161_li
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
#Feature matrix as in <a href="http://www.inetsoftware.de/products/jdbc/mssql/features/default.asp">i-net software</a>.
@roadmap_1162_li
#Support % operator (modulo)
#Updatable result set on table without primary key or unique index
@roadmap_1163_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
#Use LinkedList instead of ArrayList where applicable
@roadmap_1164_li
#Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
#Allow execution time prepare for SELECT * FROM CSVREAD(?, 'columnNameString')
@roadmap_1165_li
#Support nested transactions
#Support % operator (modulo)
@roadmap_1166_li
#Add a benchmark for big databases, and one for many users
#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_1167_li
#Compression in the result set (repeating values in the same column) over TCP/IP
#Support 1+'2'=3, '1'+'2'='12' (MS SQL Server compatibility)
#Optimizations: faster hash function for strings, byte arrays
#Compatibility with Derby: VALUES(1), (2); SELECT * FROM (VALUES (1), (2)) AS myTable(c1)
@roadmap_1184_li
#DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
#Compatibility: # is the start of a single line comment (MySQL) but date quote (Access). Mode specific
@roadmap_1185_li
#H2 Console / large result sets: use 'streaming' instead of building the page in-memory
#Run benchmarks with JDK 1.5, JDK 1.6, java -server
@roadmap_1186_li
#Benchmark: add a graph to show how databases scale (performance/database size)
#Optimizations: faster hash function for strings, byte arrays
@roadmap_1187_li
#Implement a SQLData interface to map your data over to a custom object
#DatabaseEventListener: callback for all operations (including expected time, RUNSCRIPT) and cancel functionality
@roadmap_1188_li
#In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
#H2 Console / large result sets: use 'streaming' instead of building the page in-memory
@roadmap_1189_li
#Support multiple directories (on different hard drives) for the same database
#Benchmark: add a graph to show how databases scale (performance/database size)
@roadmap_1190_li
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
#Implement a SQLData interface to map your data over to a custom object
@roadmap_1191_li
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
#In the MySQL and PostgreSQL mode, use lower case identifiers by default (DatabaseMetaData.storesLowerCaseIdentifiers = true)
@roadmap_1192_li
#Support native XML data type
#Support multiple directories (on different hard drives) for the same database
@roadmap_1193_li
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
#Server protocol: use challenge response authentication, but client sends hash(user+password) encrypted with response
@roadmap_1194_li
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
#Support EXEC[UTE] (doesn't return a result set, compatible to MS SQL Server)
@roadmap_1195_li
#Ability to resize the cache array when resizing the cache
#Support native XML data type
@roadmap_1196_li
#Time based cache writing (one second after writing the log)
#Support triggers with a string property or option: SpringTrigger, OSGITrigger
@roadmap_1197_li
#Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
#Clustering: adding a node should be very fast and without interrupting clients (very short lock)
@roadmap_1198_li
#Index usage for REGEXP LIKE.
#Ability to resize the cache array when resizing the cache
@roadmap_1199_li
#Compatibility: add a role DBA (like ADMIN).
#Time based cache writing (one second after writing the log)
@roadmap_1200_li
#Better support multiple processors for in-memory databases.
#Check state of H2 driver for DDLUtils: https://issues.apache.org/jira/browse/DDLUTILS-185
@roadmap_1201_li
#Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
#Index usage for REGEXP LIKE.
@roadmap_1202_li
#Access rights: finer grained access control (grant access for specific functions)
#Compatibility: add a role DBA (like ADMIN).
@roadmap_1203_li
#Support N'text'
#Better support multiple processors for in-memory databases.
@roadmap_1204_li
#Pure SQL triggers (example: update parent table if the child table is changed).
#Support N'text'
@roadmap_1205_li
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
#Pure SQL triggers (example: update parent table if the child table is changed).
@roadmap_1206_li
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
#In MySQL mode, for AUTO_INCREMENT columns, don't set the primary key
@roadmap_1207_li
#Support compatibility for jdbc:hsqldb:res:
#Use JDK 1.4 file locking to create the lock file (but not yet by default); writing a system property to detect concurrent access from the same VM (different classloaders).
@roadmap_1208_li
#Provide an Java SQL builder with standard and H2 syntax
#Support compatibility for jdbc:hsqldb:res:
@roadmap_1209_li
#Trace: write OS, file system, JVM,... when opening the database
#Provide an Java SQL builder with standard and H2 syntax
@roadmap_1210_li
#Support indexes for views (probably requires materialized views)
#Trace: write OS, file system, JVM,... when opening the database
@roadmap_1211_li
#Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
#Support indexes for views (probably requires materialized views)
@roadmap_1212_li
#Browser: use Desktop.isDesktopSupported and browse when using JDK 1.6
#Document SET SEARCH_PATH, BEGIN, EXECUTE, parameters
@roadmap_1213_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_1214_li
#Support data type INTERVAL
#Server: use one listener (detect if the request comes from an PG or TCP client)
@roadmap_1215_li
#Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
