This is a beta version. The next version will be 1.2.147. The differences between 1.2.x and 1.3.x are:
@changelog_1005_li
In version 1.3.x, h2.lobInDatabase (store CLOB and BLOB in the database file) is enabled by default.
@changelog_1006_li
In version 1.3.x, ANALYZE_AUTO is 2000 (automatic ANALYZE).
@changelog_1007_li
In version 1.3.x, DB_CLOSE_ON_EXIT (the shutdown hook) is disabled by default.
@changelog_1008_li
In version 1.3.x, DROP_RESTRICT (default action for DROP is RESTRICT) is enabled.
@changelog_1009_li
In version 1.3.x, FUNCTIONS_IN_SCHEMA (allow to store functions in a schema) is enabled.
@changelog_1010_li
In version 1.3.x, LARGE_TRANSACTIONS (support for very large transactions) is enabled. Changes to tables without a primary key can be buffered to disk.
@changelog_1011_li
In version 1.3.x, MAX_MEMORY_ROWS_DISTINCT is set to a 10000.
@changelog_1012_li
In version 1.3.x, NESTED_JOINS (nested joins and right outer joins) is enabled.
@changelog_1013_li
In version 1.3.x, OPTIMIZE_INSERT_FROM_SELECT (speed up CREATE TABLE ... AS SELECT) is enabled.
@changelog_1014_li
In version 1.3.x, OPTIMIZE_OR (convert OR conditions to IN(..) if possible) is enabled.
@changelog_1015_li
In version 1.3.x, QUERY_CACHE_SIZE is enabled.
@changelog_1016_li
In version 1.3.x, SELECT_FOR_UPDATE_MVCC (MVCC and SELECT FOR UPDATE) is enabled.
@changelog_1017_li
In version 1.3.x, RUNSCRIPT and SCRIPT (commands and tools), use UTF-8 by default (ScriptCommand.charset).
@changelog_1018_li
In version 1.3.x, Lucene 3 is used by default. Issue 147.
@changelog_1019_li
When the system property h2.lobInDatabase is set, the lob tables were always created when closing the database, even if the tables were not needed.
@changelog_1020_li
In the MySQL mode, SHOW TABLES didn't work, and meta data tables were not case insensitive. Updatable result sets didn't work as expected. Issue 249.
@changelog_1003_li
@changelog_1021_li
Connection-created Clob and Blob objects can now be filled using Clob.setCharacterStream(1), Clob.setString(1, s), Blob.setBytes(1, x), Blob.setBinaryStream(1). Issue 235.
@changelog_1004_li
@changelog_1022_li
Trying to convert a very small CLOB to a BLOB or a very small CLOB to a BLOB threw a NullPointerException.
@changelog_1005_li
@changelog_1023_li
INFORMATION_SCHEMA.SETTINGS: now the current page count can be queried using select * from information_schema.settings where name = 'info.PAGE_COUNT'.
@changelog_1006_li
@changelog_1024_li
For an invalid value exception, the parameter name and value was switched in some cases.
@changelog_1007_li
@changelog_1025_li
When using trace level 3, opening a database no longer prints there is a EOFException (because that is the expected behavior).
@changelog_1008_li
@changelog_1026_li
CALL calling a Java function with return type ResultSet and return value null threw a ClassCastException.
@changelog_1009_li
@changelog_1027_li
SELECT ... FROM CSVREAD no longer creates a temporary file. Some large imports are now twice as fast.
@changelog_1010_h2
@changelog_1028_h2
Version 1.2.145 (2010-11-02)
@changelog_1011_li
@changelog_1029_li
A new String cache is now created at most once every 5 second, so that out of memory exceptions are not artificially delayed.
@changelog_1012_li
@changelog_1030_li
After closing a database, the writer thread will stop after 100 ms at the latest (instead of 1 second).
@changelog_1013_li
@changelog_1031_li
Opening a large database could fail in theory if the process was killed and then not fully compacted (because the unique transaction log key was re-used).
@changelog_1014_li
@changelog_1032_li
Views now store the schema for Java functions if "functions in schemas" is enabled (system property h2.functionsInSchema).
@changelog_1015_li
@changelog_1033_li
Improved error message if the LOB files are already deleted on the client side.
@changelog_1016_li
@changelog_1034_li
Closing a Statement or PreparedStatement at the same time as executing a statement could throw a strange exception. Issue 241.
@changelog_1017_li
@changelog_1035_li
The Recover tool did not work with compressed lob files (set compress_lob lzf). Also, sometimes the Recover tool was very slow, specially using a 64-bit JVM, because it tried to de-compress lob files even if they were not compressed (which could allocate a lot of memory).
@changelog_1018_li
@changelog_1036_li
H2 Console: webAllowOthers and webSSL were swapped if they didn't exist in the properties file. Issue 244.
@changelog_1019_li
@changelog_1037_li
When the system property h2.lobInDatabase is set, CREATE TABLE ... AS SELECT with a LOB column did not always work.
@changelog_1020_li
@changelog_1038_li
Some system properties are not supported any longer, because they can already be set in the database URL. The constants are: CACHE_SIZE_DEFAULT, CACHE_TYPE_DEFAULT, DEFAULT_LOCK_MODE, LOCK_MODE_READ_COMMITTED, DEFAULT_MAX_LENGTH_INPLACE_LOB, DEFAULT_MAX_LENGTH_INPLACE_LOB2, DEFAULT_MAX_MEMORY_UNDO, DEFAULT_MAX_OPERATION_MEMORY, DEFAULT_PAGE_SIZE, DEFAULT_RESULT_SET_CONCURRENCY, MIN_WRITE_DELAY.
@changelog_1021_li
@changelog_1039_li
Various system properties have been replaced with database level settings: ALIAS_COLUMN_NAME, ANALYZE_AUTO, ANALYZE_SAMPLE, DATABASE_TO_UPPER, DEFAULT_ESCAPE, DEFRAG_ALWAYS, DROP_RESTRICT, ESTIMATED_FUNCTION_TABLE_ROWS, FUNCTIONS_IN_SCHEMA, LARGE_RESULT_BUFFER_SIZE, LARGE_TRANSACTIONS, MAX_COMPACT_COUNT, MAX_COMPACT_TIME, MAX_MEMORY_ROWS_DISTINCT, MAX_QUERY_TIMEOUT, NESTED_JOINS, OPTIMIZE_DISTINCT, OPTIMIZE_EVALUATABLE_SUBQUERIES, OPTIMIZE_INSERT_FROM_SELECT, OPTIMIZE_IN_LIST, OPTIMIZE_IS_NULL, OPTIMIZE_OR, OPTIMIZE_SUBQUERY_CACHE, OPTIMIZE_TWO_EQUALS, OPTIMIZE_UPDATE, PAGE_STORE_INTERNAL_COUNT, PAGE_STORE_TRIM, QUERY_CACHE_SIZE, RECOMPILE_ALWAYS, RECONNECT_CHECK_DELAY, SELECT_FOR_UPDATE_MVCC, SHARE_LINKED_CONNECTIONS. See the Javadoc documentation of DbSettings for details. The system properties are still supported for backward compatibility.
@changelog_1022_li
@changelog_1040_li
When the system property h2.nestedJoins was enabled, some outer joins returned the wrong result.
@changelog_1023_li
@changelog_1041_li
Opening a database could throw a NullPointerException.
@changelog_1024_li
@changelog_1042_li
After a crash, the database file did not always shrink because old transaction log pages were not removed from the file.
@changelog_1025_li
@changelog_1043_li
Various CallableStatement methods could throw a NullPointerException.
@changelog_1026_li
@changelog_1044_li
LOB files were not deleted when running DROP ALL OBJECTS.
@changelog_1027_li
@changelog_1045_li
MS SQL Server compatibility: support "N" in front of string literals ("National Language" strings). Issue 240.
@changelog_1028_li
@changelog_1046_li
CAST: when converting a string to binary, it is hex encoded (every byte two characters); a hex string can be converted to a number by first converting it to binary. Examples: CAST(CAST('FFFF' AS BINARY) AS INT) = 65535, CAST(65535 AS BINARY) = '0000FFFF'.
@changelog_1029_li
@changelog_1047_li
When a domain (user defined data type) contained a user defined function, the database could not be opened.
@changelog_1030_li
@changelog_1048_li
CAST('011' AS INT) will no longer use decode the value as an octal number (using Integer.decode) but now use Integer.parseInt. The same logic applied to byte, short, and long. This also means that trying to convert hex numbers (0x...) with CAST now fails.
@changelog_1031_li
@changelog_1049_li
A table in the Recover tool script could not be imported if the script contained duplicate keys.
@changelog_1032_h2
@changelog_1050_h2
Version 1.2.144 (2010-10-15)
@changelog_1033_li
@changelog_1051_li
The Windows .bat files did not contain CR+LF.
@changelog_1034_li
@changelog_1052_li
The LOB storage (when the system property h2.lobInDatabase is set) is now only initialized when needed.
@changelog_1035_li
@changelog_1053_li
The index condition columnName IS NULL was not efficient when using a clustered index.
@changelog_1036_li
@changelog_1054_li
The Recover tool did not work for databases larger than 2 GB.
@changelog_1037_li
@changelog_1055_li
In memory database: outer joins with a condition "column is null" could return the wrong result.
@changelog_1038_li
@changelog_1056_li
Temporary files were not created in the temporary directory of the system, but in the current working directory. This affected temporary undo log files for read-only databases, temporary files for large result sets when using read-only databases, and temporary LOB files when storing LOBs in the database (system property h2.lobInDatabase). When the setting h2.lobInDatabase is not set, temporary LOB files are still stored in a sub-directory (.lobs.db/) of the current working directory.
@changelog_1039_li
@changelog_1057_li
New experimental feature to speed up CREATE TABLE ... AS SELECT. To enable the feature, set the system property h2.optimizeInsertFromSelect to true. For large queries, performance can be doubled.
@changelog_1040_li
@changelog_1058_li
When LOB objects are stored in the database (using the experimental setting h2.lobInDatabase), and using the MVCC mode, opening a database with uncommitted transactions could throw a NullPointerException.
@changelog_1041_li
@changelog_1059_li
Support of stored procedures with OUT parameters in CallableStatement is implemented.
@changelog_1042_li
@changelog_1060_li
PreparedStatement.getMetaData() was not always consistent with resulting ResultSet.getMetaData().
@changelog_1043_li
@changelog_1061_li
The build tool now uses JAVA_HOME for javac as well. Issue 233.
@changelog_1044_li
@changelog_1062_li
Opening and closing encrypted databases is now much faster.
@changelog_1045_li
@changelog_1063_li
H2 Console: new experimental feature to support file download and upload, but only if there is a directory called "transfer" in the current working directory. For security reasons, only very simple file names are supported. Sub-directories are not supported. To upload, use transfer.jsp; to download, use transfer/fileName.
@changelog_1046_li
@changelog_1064_li
A new sample application that shows how to manually create an encrypted and compressed script file.
@changelog_1047_li
@changelog_1065_li
Performance has been improved a bit.
@changelog_1048_li
@changelog_1066_li
DatabaseMetaData.getJDBCMajorVersion now returns 4 (instead of 3) when the driver is compiled with Java 6 (the default).
@changelog_1049_li
@changelog_1067_li
Re-added the internal utility class BitField which improves performance of opening and closing a database (because it supports setByte / getByte, unlike java.util.BitSet).
@changelog_1050_li
@changelog_1068_li
INFORMATION_SCHEMA.SESSIONS: the start time of a SQL statement is no longer set in each case. It is only set for long running statements. This change should improve performance a bit on some devices, specially when using Android.
@changelog_1051_li
@changelog_1069_li
A old databases without user name and password (created with H2 version 1.2.142 or older) couldn't be opened with version 1.2.143. Fixed.
@changelog_1052_li
@changelog_1070_li
The database upgrade classes have been renamed.
@changelog_1053_li
@changelog_1071_li
The database did not automatically upgrade when using a connection pool or data source.
@changelog_1054_li
@changelog_1072_li
JaQu: a database object can now also be created using a DataSource. Issue 227.
@changelog_1055_li
@changelog_1073_li
The built-in profiler now better supports the Dalvik VM.
@changelog_1056_li
@changelog_1074_li
The jarSmall build target no longer includes assertions (SysProperties.CHECK, CHECK2, system properties h2.check and h2.check2).
@changelog_1057_li
@changelog_1075_li
The jarSmall build target excluded the DbUpgrade classes by mistake.
@changelog_1058_h2
@changelog_1076_h2
Version 1.2.143 (2010-09-18)
@changelog_1059_li
@changelog_1077_li
If the user name and password are not set or empty, then the password is not hashed. To disable this behavior, set the system property h2.emptyPassword to false. TCP server: the default user name for the management database is now an empty string.
@changelog_1060_li
@changelog_1078_li
Cluster: auto-commit was disabled after opening a connection.
@changelog_1061_li
@changelog_1079_li
Connection.getAutoCommit() is now much faster, specially when using the server mode.
@changelog_1062_li
@changelog_1080_li
Statement.cancel() had no effect when using the server mode.
@changelog_1063_li
@changelog_1081_li
SCRIPT: the SQL script no longer contains settings that match the default value.
@changelog_1064_li
@changelog_1082_li
Statement.cancel() did not work when running RUNSCRIPT and SCRIPT.
@changelog_1065_li
@changelog_1083_li
Statement.cancel() could cause a NullPointerException.
@changelog_1066_li
@changelog_1084_li
In some cases (specially when using a small cache size or a large database over 1 GB) for some operations like ALTER TABLE the data was written before the transaction log entries, which could cause a corrupt database if the process was killed during the ALTER TABLE operation. Thanks a lot to Victor Pyankov for helping solve this problem!
@changelog_1067_li
@changelog_1085_li
The Recover tool could throw a ArrayIndexOutOfBoundsException when trying to recover a corrupt database file.
@changelog_1068_li
@changelog_1086_li
The SCRIPT command and tool now uses the default file encoding for the system now instead of UTF-8 (as before). In most cases, this will not affect existing applications, as the encoding only affects how SQL identifiers (table names and so on) that contain special characters are stored. Table data is escaped, and therefore is no problem.
@changelog_1069_li
@changelog_1087_li
The SCRIPT command and tool now also support the CHARSET option (like RUNSCRIPT).
@changelog_1070_li
@changelog_1088_li
When closing a database, sometimes empty space in the database was not freed up.
@changelog_1071_li
@changelog_1089_li
Trying to create a view with parameters in the query will now throw an exception. So far, creating the view was allowed, but the parameter value was not used (null was used instead).
@changelog_1072_li
@changelog_1090_li
New experimental feature SHUTDOWN DEFRAG. This option re-orders the pages while closing the database so that table scans are faster.
@changelog_1073_li
@changelog_1091_li
When using the MULTI_THREADED option, concurrently reading from a database (specially from a larger database, or when using a small cache size) could throw an exception.
@changelog_1074_li
@changelog_1092_li
When adding a comment to a column that has a check constraint, the database couldn't be re-opened.
@changelog_1075_li
@changelog_1093_li
New system property h2.lobClientMaxSizeMemory to set the maximum size of a LOB object to keep in memory on the client side when using the server mode.
@changelog_1076_h2
@changelog_1094_h2
Version 1.2.142 (2010-08-31)
@changelog_1077_li
@changelog_1095_li
Documentation for using H2 on Android devices has been added under Tutorial - Android.
@changelog_1078_li
@changelog_1096_li
An ArrayIndexOutOfBoundsException was thrown when querying the table information_schema.function_aliases while there are any user defined aggregate functions.
@changelog_1079_li
@changelog_1097_li
The jar files are now about 50 KB smaller. In the last few versions they contained superfluous classes.
@changelog_1080_li
@changelog_1098_li
The default time to compact a database when closing (system property h2.maxCompactTime) is now 0.2 seconds instead of 1 second.
@changelog_1081_li
@changelog_1099_li
Opening an closing a database is now faster.
@changelog_1082_li
@changelog_1100_li
In theory, when using indexes with large index rows (or when using a very small page size), removing rows could throw an internal exception in some cases.
@changelog_1083_li
@changelog_1101_li
Inserting rows in reverse order could throw an ArrayIndexOutOfBoundsException in some cases (specially rows larger than the page size, which is 2 KB by default). Issue 226.
@changelog_1084_li
@changelog_1102_li
H2 Console: with Chrome and Safari, resizing the table/query frame doesn't work. Issue 225.
@changelog_1085_li
@changelog_1103_li
New experimental database file locking mechanism "FS" to use native file locking (no *.lock.db file is created in this case, and no background thread is started). This mechanism may not work on all systems (on some systems it's possible to lock the same file multiple times within the same virtual machine, and on some system native file locking is not working or unlocking is not working).
@changelog_1086_h2
@changelog_1104_h2
Version 1.2.141 (2010-08-22)
@changelog_1087_li
@changelog_1105_li
New experimental pseudo-encryption algorithm "FOG". It makes the data appear to be encrypted. This algorithm is cryptographically extremely weak, and should only be used to hide data from reading the plain text using a text editor. Please let us know if you think this is useful or not.
@changelog_1088_li
@changelog_1106_li
Documentation: the grammar and function documentation can now be easier translated.
@changelog_1089_li
@changelog_1107_li
Password hash: in addition to connecting with the plain text password, H2 now supports connecting with the password hash. Like this you don't have to store plain text passwords in config files. For details, see the documentation at Advanced / Password Hash.
@changelog_1090_li
@changelog_1108_li
Lucene 3.x support was added in the source code, however it is not yet enabled by default and is not yet supported when using the default h2 jar file. To enable Lucene 3.x support, the source code of H2 needs to be switched using <code>./build.sh -Dlucene=3 switchSource</code>, and then re-compile. To switch the source code back use <code>./build.sh -Dlucene=2 switchSource</code> (replace ./build.sh with build.bat on Windows). The plan is to use Lucene 3 by default in H2 version 1.3.x. Issue 147.
@changelog_1091_li
@changelog_1109_li
The native fulltext search could cause a Java level deadlock if searching from multiple connections concurrently.
@changelog_1092_li
@changelog_1110_li
CREATE FORCE VIEW didn't work in most cases if a referenced table didn't exist.
@changelog_1093_li
@changelog_1111_li
MVCC: when trying to insert two rows with the same key from two connections, the second connection immediately threw the exception "Unique index or primary key violation". Instead, the second connection now waits throwing the exception until the first connection committed the change (same as when trying to concurrently update the same row).
@changelog_1094_li
@changelog_1112_li
Server mode: if the client ran with a different timezone setting than the server, date values got shifted by the difference between the timezones. This problem affected the data types DATE, TIME, and TIMESTAMP, when using PreparedStatement.setDate / setTime / setTimestamp and ResultSet.getDate / getTime / getTimestamp. To solve the problem, both the client and the server need to be updated (otherwise the old transfer protocol is used).
@changelog_1095_li
@changelog_1113_li
The built-in connection pool (JdbcConnectionPool) did not always honor the login timeout (the timeout could occur much too early). Thanks a lot to Dario Fassi for the patch!
@changelog_1096_li
@changelog_1114_li
Translation: the new messages have been translated to Spanish. Thanks a lot to Dario Fassi!
@changelog_1097_li
@changelog_1115_li
The table INFORMATION_SCHEMA.SETTINGS now contains all H2-specific system properties (the ones that start with "h2.") and that are explicitly set. Previously, some H2-specific settings (for example h2.analyzeAuto) were missing in this list.
@changelog_1098_li
@changelog_1116_li
EXPLAIN ANALYZE with an in-memory database threw an exception. Issue 216.
@changelog_1099_li
@changelog_1117_li
Data modifications (inserts, updates, and deletes) are now up to 5 times faster because converting objects to byte arrays is avoided if possible.
@changelog_1100_li
@changelog_1118_li
LOG=0 is now a bit faster (previously undo log entries were still written).
@changelog_1101_li
@changelog_1119_li
The command line tools now say so if the source directory of an option doesn't exist.
@changelog_1102_li
@changelog_1120_li
It is now allowed to truncate a table if referential integrity has been disabled for this table or database.
@changelog_1103_li
@changelog_1121_li
For unencrypted databases, the automatic upgrade temporary script file is now unencrypted again.
@changelog_1104_h2
@changelog_1122_h2
Version 1.2.140 (2010-07-25)
@changelog_1105_li
@changelog_1123_li
The default MAX_LOG_SIZE is now 16 MB instead of 2 MB. Some uses cases are 3 times faster now.
@changelog_1106_li
@changelog_1124_li
Improved cache memory usage calculation.
@changelog_1107_li
@changelog_1125_li
Only resources that are actually used are loaded in memory. This can reduce the memory usage by about 400 KB.
@changelog_1108_li
@changelog_1126_li
Profiling: the jar file can now be installed as an agent using java -javaagent:h2*.jar - this was be used to more accurately calculate the memory footprint of the cache. It has no effect when using H2 (using this feature in an application is not needed and not recommended).
@changelog_1109_li
@changelog_1127_li
The cache was not used efficiently when reading (behaving like a FIFO cache instead of an LRU cache).
@changelog_1110_li
@changelog_1128_li
Storing lobs in the database has been changed. It is now faster. Unfortunately, the change is not backward compatible; if you have used h2.lobInDatabase before you will need to re-build the database.
@changelog_1111_li
@changelog_1129_li
SHUTDOWN COMPACT is now faster.
@changelog_1112_li
@changelog_1130_li
H2 Console: requesting the status did not always show the window on top of others.
@changelog_1113_li
@changelog_1131_li
H2 Console: on some system, the browser windows got opened when requesting a new one.
@changelog_1114_li
@changelog_1132_li
The built-in profiling tool now uses a default stack depth of 32 elements and a default interval of 10 ms.
@changelog_1115_li
@changelog_1133_li
Database files now grows in 1 MB blocks (and at least 20% at a time), instead of always 256 KB. This speeds up loading a new database.
@changelog_1116_li
@changelog_1134_li
H2 Console: new built-in command @sleep to help profile another session.
@changelog_1117_li
@changelog_1135_li
For improved performance, LOG=0 and LOG=1 are again supported. LOG=0 means the transaction log is disabled completely (fastest; for loading a database). LOG=1 means the transaction log is enabled, but FileDescriptor.sync is disabled (if no protection against power failure is required). LOG=2 is the default (transaction log is enabled, FileDescriptor.sync for each checkpoint).
@changelog_1118_li
@changelog_1136_li
After deleting a lot of data (for example by dropping or altering tables, or indexes, or after a large transaction), opening a large database was very slow. Fixed.
@changelog_1119_li
@changelog_1137_li
When killing the process after creating and dropping many tables (specially temporary tables), the database could not be opened sometimes.
@changelog_1120_li
@changelog_1138_li
CAST(NULL AS ...) doesn't forget the data type, precision, and scale any longer.
@changelog_1121_li
@changelog_1139_li
Experimental support for recursive queries (see 'Advanced' - 'Recursive Queries' for details).
@changelog_1122_li
@changelog_1140_li
Problems with JDK 1.6.0_18 have been reports in the class StringUtils.quoteRemarkSQL. This method is now changed.
@changelog_1123_li
@changelog_1141_li
The "small jar" distribution did not include the CompressTool, which was required for some operations. Fixed.
@changelog_1124_li
@changelog_1142_li
The build tool now supports (minimalistic) shell mode, started using ./build.sh -
@changelog_1125_li
@changelog_1143_li
IS NULL comparison with nested queries and linked tables did not work. Example: select * from (select x from test) where x is null.
@changelog_1126_li
@changelog_1144_li
Support for null-safe equals. This includes the ANSI SQL standard syntax A IS [NOT] DISTINCT FROM B as well as the shorter A IS [NOT] B.
@changelog_1127_li
@changelog_1145_li
Primary key violations threw a strange exception message when using a single column INT or BIGINT key.
@changelog_1128_li
@changelog_1146_li
EXPLAIN ANALYZE now also lists the number of pages read from the file.
@changelog_1129_li
@changelog_1147_li
Memory mapped files: There was a bug in version 1.2.139 so that memory mapped files could only be used together with split, for example: split:nioMapped: - the problem is now solved. It is still a good idea to use split:nioMapped: to work around the 2 GB limitation of memory mapped files.
@changelog_1130_li
@changelog_1148_li
Memory mapped files: the system property h2.nioCleanerHack is now disabled by default because it was not always working as expected. Now System.gc() is used in a loop until the buffer is garbage collected. This of course is also not a nice solution, but the only one known to work. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038
@changelog_1131_li
@changelog_1149_li
Bugfixes for the automatic 1.1 db migration.
@changelog_1132_li
@changelog_1150_li
If an old 1.1 database file version is found on connect, it is now possible to let the old h2 classes (v 1.2.128) connect to the database. The automatic upgrade .jar file must be present, and the url must contain NO_UPGRADE=TRUE
@changelog_1133_li
@changelog_1151_li
The automatic upgrade temporary script file is now encrypted.
@changelog_1134_h2
@changelog_1152_h2
Version 1.2.139 (2010-07-10)
@changelog_1135_li
@changelog_1153_li
There was a bug in the internal IntIntHashMap. There were no known side effects however.
@changelog_1136_li
@changelog_1154_li
ANALYZE now uses less memory.
@changelog_1137_li
@changelog_1155_li
Memory mapped file system: improved error messages if there is a problem.
@changelog_1138_li
@changelog_1156_li
The Lucene fulltext search did not work well when using special file systems such as split or nioMapped.
@changelog_1139_li
@changelog_1157_li
The memory mapped file system (nioMapped: file prefix) couldn't seek past the file length.
@changelog_1140_li
@changelog_1158_li
Some file system operations did not work with stacked file systems (for example split and nioMapped). This also affected the DeleteDbFiles tool.
@changelog_1141_li
@changelog_1159_li
New experimental query cache. The cache is only used if the SQL statement and all parameters match. Each session has it's own cache with the given size. Only the last returned result per query is cached. Only SELECT statements are cached (excluding UNION and FOR UPDATE statements). This works for both statements and prepared statement. To enable, set the system property h2.commandCacheSize to a value larger than 0. There is currently no plan to enable this option by default in future versions.
@changelog_1142_li
@changelog_1160_li
Conditions with many OR operations could throw an UnsupportedOperationException if h2.optimizeOr was enabled.
@changelog_1143_li
@changelog_1161_li
XA connection: after transaction commit or rollback, the physical connection is set into autocommit mode.
@changelog_1144_li
@changelog_1162_li
MULTI_THREADED did not work correctly and could throw the exception "try to add a record twice" for larger databases because cache access was not correctly synchronized.
@changelog_1145_li
@changelog_1163_li
Automatic database upgrade from non page store is now possible. If the classes from the h2mig_pagestore_addon.jar file are in the classpath, the database will be converted to the current page store format automatically. The file can be found here: <a href="http://h2database.com/h2mig_pagestore_addon.jar">http://h2database.com/h2mig_pagestore_addon.jar</a>
@changelog_1146_li
@changelog_1164_li
The MultiDimension tools was extended with a few helper methods. The API was unified a bit.
@changelog_1147_li
@changelog_1165_li
ODBC: MS Access could not link to a table with unique index or primary key. To solve this problem, index meta data is currently disabled for ODBC. When using the new H2 version to access a database over ODBC, the PostgreSQL catalog is automatically upgraded. Using a database with an upgraded PostgreSQL catalog with an older version of H2 is still possible, but not over ODBC.
@changelog_1148_li
@changelog_1166_li
ODBC: MS Access could not link to a table with a name containing '_'.
@changelog_1149_li
@changelog_1167_li
ODBC: additional connection settings can now be added to the database name. Example: ~/test;cipher=xtea. Therefore, encrypted databases are supported.
@changelog_1150_li
@changelog_1168_li
Local temporary tables can now be created without having to commit a transaction using CREATE LOCAL TEMPORARY TABLE TEMP(ID INT PRIMARY KEY) TRANSACTIONAL.
@changelog_1151_li
@changelog_1169_li
New system property h2.dropRestrict (default false) to change the default action for DROP TABLE and DROP VIEW (false for CASCADE, true for RESTRICT). The plan is to enable this property by default in version 1.3.x.
@changelog_1152_li
@changelog_1170_li
DROP TABLE now also supports CASCADE (still the default) and RESTRICT.
@changelog_1153_li
@changelog_1171_li
The wrong exception was thrown when trying to connect to a server if the server was not running.
@changelog_1154_li
@changelog_1172_li
UNION queries where the first query contains a nested query were parsed incorrectly. Example: "select 1 from (select 2 from dual) union select 3 from dual" was parsed as "select 1 from ((select 2 from dual) union select 3 from dual)". Fixed.
@changelog_1155_li
@changelog_1173_li
Support ALTER SCHEMA name RENAME TO newName (rename schema). (patch from Kerry Sainsbury)
@changelog_1156_h2
@changelog_1174_h2
Version 1.2.138 (2010-06-27)
@changelog_1157_li
@changelog_1175_li
Referential integrity: it was not allowed to delete a row with NULL in the parent table, if there was a row with NULL in the child table.
@changelog_1158_li
@changelog_1176_li
Experimental feature to support case sensitive catalog names and database names using the DATABASE() method. To use this feature, set the system property h2.databaseToUpper to false. The plan is to set the property to false by default in version 1.3.x. Issue 204 - thanks to Sylvain Cuaz (ILM Informatique) for the patch.
@changelog_1159_li
@changelog_1177_li
Experimental feature to support nested joins. To enable, set the system property h2.nestedJoins to true. If enabled, nested joins and right outer joins should work as expected (issues 145, 177, and 203). The plan is to enable this feature by default in version 1.3.x.
@changelog_1160_li
@changelog_1178_li
New sample application: CachedPreparedStatements.
@changelog_1161_li
@changelog_1179_li
When creating functions within a schema, those functions could not be used in views, nested queries, and constraints. Fixed.
@changelog_1162_li
@changelog_1180_li
The benchmarks have been run using recent database versions.
@changelog_1163_li
@changelog_1181_li
Version 1.2.137 could still not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision).
@changelog_1164_li
@changelog_1182_li
Cluster: non-admin users could not connect when one of the cluster node was stopped. Issue 206.
@changelog_1165_li
@changelog_1183_li
DROP VIEW now supports the CASCADE and RESTRICT clauses (patch from Kerry Sainsbury)
@changelog_1166_li
@changelog_1184_li
CREATE VIEW now supports the OR REPLACE clause (patch from Kerry Sainsbury)
@changelog_1167_li
@changelog_1185_li
Build tool: ability to only run one test using the -Dtest=className setting. eg: build -Dtest=org.h2.test.db.TestViewDropView test (patch from Kerry Sainsbury).
@changelog_1168_h2
@changelog_1186_h2
Version 1.2.137 (2010-06-06)
@changelog_1169_li
@changelog_1187_li
Statements with a nested query and a condition that was always NULL threw an IndexOutOfBoundsException. Example: select * from (select null as x) where x=1
@changelog_1170_li
@changelog_1188_li
The changes that were made to support large transactions also fixed a bug with large transactions (when the undo log file size is larger than 2 GB).
@changelog_1171_li
@changelog_1189_li
Experimental feature to support very large transactions (except when using MVCC). To enable, set the system property h2.largeTransactions to true. If enabled, changes to tables without a primary key can be buffered to disk. The plan is to enable this feature by default in version 1.3.x.
@changelog_1172_li
@changelog_1190_li
H2 Console: editing result sets is now also working for database other than H2, if they do support updatable result sets. Add "@edit" before the query. Only limited testing has been done on this feature, some data types may not work (please provide feedback if you find issues).
@changelog_1173_li
@changelog_1191_li
Cluster: an open transaction was committed when a cluster node was stopped (because disabling the cluster executes SET CLUSTER '', which committed the transaction). Transaction are no longer committed when calling SET CLUSTER. Issue 199.
@changelog_1174_li
@changelog_1192_li
Cluster: non-admin users couldn't connect to the cluster and couldn't disable the cluster. Issue 201.
@changelog_1175_li
@changelog_1193_li
Cluster: NEXTVAL('sequence') was only called on one cluster node, therefore sequence values could get out of sync.
@changelog_1176_li
@changelog_1194_li
Version 1.2.136 could not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision). A workaround has been implemented.
@changelog_1177_li
@changelog_1195_li
The error code of IO exceptions in CSV functions was incorrect.
@changelog_1178_li
@changelog_1196_li
The TriggerPassData example now uses a prefix (the database name).
@changelog_1179_li
@changelog_1197_li
The wrong exception was thrown when trying to reference a table that doesn't support references such as a table in the information schema.
@changelog_1180_li
@changelog_1198_li
Server.shutdownTcpServer can now stop all TCP servers on this JVM.
@changelog_1181_li
@changelog_1199_li
JdbcConnectionPool: the default connection timeout is now 30 seconds (it used to be 5 minutes).
@changelog_1182_li
@changelog_1200_li
LOB storage: LOBs added with "h2.lobInDatabase" enabled couldn't be read later with this option disabled.
@changelog_1183_h2
@changelog_1201_h2
Version 1.2.136 (2010-05-24)
@changelog_1184_li
@changelog_1202_li
When using ORDER BY and there are both ascending and descending indexes, the database used the first index even when the second one could be used for sorting.
@changelog_1185_li
@changelog_1203_li
Conditions of the form columnName IS NULL now use an index. To disable this feature, set the system property h2.optimizeIsNull to false.
@changelog_1186_li
@changelog_1204_li
H2 Console: when the settings were not stored yet (for example when running for the first time), the last recently used settings were not stored. A workaround was to create the file ".h2.server.properties" manually in the current user home directory, with the contents: webAllowOthers=false, webPort=8082, webSSL=false, 0=Generic H2 (Embedded)|org.h2.Driver|jdbc\:h2\:~/test|sa (where a comma is a newline).
@changelog_1187_li
@changelog_1205_li
The source code is now switched to Java 6 (JDK 1.6) by default. Java 5 (JDK 1.5) is still supported, and the jar file is still compiled for Java 5.
@changelog_1188_li
@changelog_1206_li
The BOM (the byte-order-mark) character 0xfeff at the beginning of the file is ignored. This is for compatibility with Microsoft Excel.
@changelog_1189_li
@changelog_1207_li
When opening an existing database, the cache size is set to at most half the amount of memory available for the virtual machine (Runtime.getRuntime().maxMemory()), even if the cache size setting stored in the database is larger. Setting the cache size in the database URL or explicitly using SET CACHE_SIZE overrides this value (even if larger than the physical memory).
@changelog_1190_li
@changelog_1208_li
INFORMATION_SCHEMA.SETTINGS: the cache size is now returned in KB.
@changelog_1191_li
@changelog_1209_li
New system property h2.selectForUpdateMvcc, the default is false (the feature is disabled). When enabled, SELECT ... FOR UPDATE only locks the selected rows in the MVCC mode. Aggregate or GROUP BY queries are not allowed in this case.
@changelog_1192_li
@changelog_1210_li
Profiler: improved message if there was no stack trace.
@changelog_1193_li
@changelog_1211_li
The H2 Console can now be used within another application, in a frame or iframe. Issue 197.
@changelog_1194_li
@changelog_1212_li
Recover tool: the statistics section now includes page type counts again.
@changelog_1195_li
@changelog_1213_li
Queries with multiple IN(...) conditions sometimes return the wrong results when there was a multi-column index for the column.
@changelog_1196_li
@changelog_1214_li
Queries with IN(..., NULL) did sometimes return the wrong results when there was a index for the column.
@changelog_1197_li
@changelog_1215_li
DECIMAL: faster precision and memory usage calculations.
@changelog_1198_li
@changelog_1216_li
A new class org.h2.tools.TriggerAdapter allows to use the ResultSet interface within trigger implementations.
@changelog_1199_li
@changelog_1217_li
A subselect which used an index could lead to wrong results. Fixed.
@changelog_1200_li
@changelog_1218_li
Creating a cached temporary non persistent table with a primary key threw a NullPointerException.
@changelog_1201_h2
@changelog_1219_h2
Version 1.2.135 (2010-05-08)
@changelog_1202_li
@changelog_1220_li
Temporary files were not deleted when using large transactions, disabling autocommit, and closing the session without committing.
@changelog_1203_li
@changelog_1221_li
Queries using multiple IN(..) conditions on the same table could cause repeated rows in the result set.
@changelog_1204_li
@changelog_1222_li
Translation: Lubomir Grajciar translated the H2 Console as well as all error message to Slovensky. Thanks a lot!
@changelog_1205_li
@changelog_1223_li
There was a possible Java level deadlock when opening an uninitialized database and using a file system that also opened a database.
@changelog_1206_li
@changelog_1224_li
When killing the process while the database was writing a checkpoint, while it was closing, or while running recovery (while removing temporary tables from a previous run), the database could become corrupt. A new test case has been implemented to ensure such problems can not occur in the future.
@changelog_1207_li
@changelog_1225_li
File system: new method FileSystem.setReadOnly.
@changelog_1208_li
@changelog_1226_li
The page size for new databases can now be set in the database URL using ;PAGE_SIZE=512. Currently this feature is only used to simplify testing.
@changelog_1209_li
@changelog_1227_li
New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1210_li
@changelog_1228_li
Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1211_li
@changelog_1229_li
Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1212_li
@changelog_1230_li
Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1213_li
@changelog_1231_li
Auto-reconnect: if another connection uses the database in exclusive mode then this connection will try to re-connect until the exclusive mode ends. This is important when using the cluster mode.
@changelog_1214_li
@changelog_1232_li
SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1215_li
@changelog_1233_li
Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1216_li
@changelog_1234_li
Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1217_li
@changelog_1235_li
The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1218_li
@changelog_1236_li
The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1219_li
@changelog_1237_li
The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1220_li
@changelog_1238_li
Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1221_li
@changelog_1239_li
Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1222_li
@changelog_1240_li
The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1223_li
@changelog_1241_li
When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1224_li
@changelog_1242_li
Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1225_li
@changelog_1243_li
UNIQUE was not listed as a keyword.
@changelog_1226_li
@changelog_1244_li
Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1227_li
@changelog_1245_li
For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1228_li
@changelog_1246_li
The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1229_li
@changelog_1247_li
If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1230_li
@changelog_1248_li
New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1231_li
@changelog_1249_li
INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1232_h2
@changelog_1250_h2
Version 1.2.134 (2010-04-23)
@changelog_1233_li
@changelog_1251_li
New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1234_li
@changelog_1252_li
JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1235_li
@changelog_1253_li
MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1236_li
@changelog_1254_li
MERGE did not respect foreign key and check constraints.
@changelog_1237_li
@changelog_1255_li
ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1238_li
@changelog_1256_li
When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1239_li
@changelog_1257_li
Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1240_li
@changelog_1258_li
H2 Console: the built-in commands are now documented.
@changelog_1241_li
@changelog_1259_li
REPLACE: if any parameter is null, the result is null.
@changelog_1242_li
@changelog_1260_li
Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1243_li
@changelog_1261_li
The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1244_li
@changelog_1262_li
H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1245_li
@changelog_1263_li
The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1246_li
@changelog_1264_li
The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1247_li
@changelog_1265_li
Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1248_li
@changelog_1266_li
If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1249_h2
@changelog_1267_h2
Version 1.2.133 (2010-04-10)
@changelog_1250_li
@changelog_1268_li
A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1251_li
@changelog_1269_li
The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1252_li
@changelog_1270_li
The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1253_li
@changelog_1271_li
Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1254_li
@changelog_1272_li
The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1255_li
@changelog_1273_li
New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1256_li
@changelog_1274_li
ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1257_li
@changelog_1275_li
Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1258_li
@changelog_1276_li
Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1259_li
@changelog_1277_li
When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1260_li
@changelog_1278_li
Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1261_li
@changelog_1279_li
H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1262_li
@changelog_1280_li
H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1263_h2
@changelog_1281_h2
Version 1.2.132 (2010-03-21)
@changelog_1264_li
@changelog_1282_li
The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1265_li
@changelog_1283_li
User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1266_li
@changelog_1284_li
Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1267_li
@changelog_1285_li
When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1268_li
@changelog_1286_li
The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1269_li
@changelog_1287_li
Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1270_li
@changelog_1288_li
When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1271_li
@changelog_1289_li
The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1272_li
@changelog_1290_li
CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1273_li
@changelog_1291_li
Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1274_li
@changelog_1292_li
The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1275_li
@changelog_1293_li
When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1276_li
@changelog_1294_li
Literals of type BIGINT now have the correct data type.
@changelog_1277_h2
@changelog_1295_h2
Version 1.2.131 (2010-03-05)
@changelog_1278_li
@changelog_1296_li
Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1279_li
@changelog_1297_li
In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1280_li
@changelog_1298_li
After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1281_li
@changelog_1299_li
An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1282_h2
@changelog_1300_h2
Version 1.2.130 (2010-02-26)
@changelog_1283_li
@changelog_1301_li
EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1284_li
@changelog_1302_li
IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1285_li
@changelog_1303_li
IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1286_li
@changelog_1304_li
For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1287_li
@changelog_1305_li
PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1288_li
@changelog_1306_li
A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1289_li
@changelog_1307_li
When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1290_li
@changelog_1308_li
Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1291_li
@changelog_1309_li
The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1292_li
@changelog_1310_li
Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1293_li
@changelog_1311_li
Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1294_h2
@changelog_1312_h2
Version 1.2.129 (2010-02-19)
@changelog_1295_li
@changelog_1313_li
The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
@changelog_1296_li
@changelog_1314_li
CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1297_li
@changelog_1315_li
MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1298_li
@changelog_1316_li
Hash indexes now are only used for single column indexes.
@changelog_1299_li
@changelog_1317_li
The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
@changelog_1300_li
@changelog_1318_li
The file system abstraction no longer throws SQL exceptions.
@changelog_1301_li
@changelog_1319_li
DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1302_li
@changelog_1320_li
The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1303_li
@changelog_1321_li
SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1304_li
@changelog_1322_li
When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
@changelog_1305_li
@changelog_1323_li
The BNF parser now uses the visitor pattern.
@changelog_1306_li
@changelog_1324_li
Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1307_li
@changelog_1325_li
The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
@changelog_1308_li
@changelog_1326_li
H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1309_li
@changelog_1327_li
A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1310_li
@changelog_1328_li
The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1311_li
@changelog_1329_li
Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1312_li
@changelog_1330_li
Server.startWebServer(Connection) was not working as expected.
@changelog_1313_li
@changelog_1331_li
The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1314_li
@changelog_1332_li
The database URL option RECOVER has currently no effect.
@changelog_1315_li
@changelog_1333_li
Converting an old (non-page store) database is no longer supported using this version.
@changelog_1316_li
@changelog_1334_li
The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
@changelog_1317_li
@changelog_1335_li
The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1318_li
@changelog_1336_li
Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
@changelog_1319_li
@changelog_1337_li
The translated resources are now stored in UTF-8 format.
@changelog_1320_li
@changelog_1338_li
The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1321_h2
@changelog_1339_h2
Version 1.2.128 (2010-01-30)
@changelog_1322_li
@changelog_1340_li
There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
@changelog_1323_li
@changelog_1341_li
The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1324_li
@changelog_1342_li
Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1325_li
@changelog_1343_li
Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1326_li
@changelog_1344_li
If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
@changelog_1327_li
@changelog_1345_li
Less classes are loaded when using the database in embedded mode.
@changelog_1328_li
@changelog_1346_li
The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
@changelog_1329_li
@changelog_1347_li
Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
@changelog_1330_li
@changelog_1348_li
Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
@changelog_1331_li
@changelog_1349_li
Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1332_li
@changelog_1350_li
Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1333_li
@changelog_1351_li
MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
@changelog_1334_li
@changelog_1352_li
If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1335_li
@changelog_1353_li
Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1336_li
@changelog_1354_li
New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1337_li
@changelog_1355_li
Slightly improved performance if the table is already locked.
@changelog_1338_li
@changelog_1356_li
CompressLZF: faster decompression.
@changelog_1339_li
@changelog_1357_li
PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1340_li
@changelog_1358_li
Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1341_h2
@changelog_1359_h2
Version 1.2.127 (2010-01-15)
@changelog_1342_li
@changelog_1360_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_1343_li
@changelog_1361_li
Page store: new databases can not be opened with older versions.
@changelog_1344_li
@changelog_1362_li
Page store: adding data to new database is now faster.
@changelog_1345_li
@changelog_1363_li
File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1346_li
@changelog_1364_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_1347_li
@changelog_1365_li
SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1348_li
@changelog_1366_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_1349_li
@changelog_1367_li
Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1350_li
@changelog_1368_li
If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1351_li
@changelog_1369_li
Alter table is now supported even if a table has views defined. (Patch from Kerry Sainsbury).
@changelog_1352_li
@changelog_1370_li
Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1353_li
@changelog_1371_li
The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1354_li
@changelog_1372_li
Trigger can now be called on rollback.
@changelog_1355_li
@changelog_1373_li
The shell script h2.sh ignored command line line arguments.
@changelog_1356_li
@changelog_1374_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_1357_li
@changelog_1375_li
The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1358_li
@changelog_1376_li
Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1359_li
@changelog_1377_li
The .trace.db file is now only created if required.
@changelog_1360_li
@changelog_1378_li
Shell tool: improved PostgreSQL compatibility.
@changelog_1361_li
@changelog_1379_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_1362_li
@changelog_1380_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_1363_li
@changelog_1381_li
Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1364_li
@changelog_1382_li
Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1365_li
@changelog_1383_li
CompressLZF: Faster decompress and improved javadocs
@changelog_1366_h2
@changelog_1384_h2
Version 1.2.126 (2009-12-18)
@changelog_1367_li
@changelog_1385_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_1368_li
@changelog_1386_li
CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1369_li
@changelog_1387_li
Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1370_li
@changelog_1388_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_1371_li
@changelog_1389_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_1372_li
@changelog_1390_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_1373_li
@changelog_1391_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_1374_li
@changelog_1392_li
JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1375_li
@changelog_1393_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_1376_li
@changelog_1394_li
The reserve heap memory is no longer used.
@changelog_1377_li
@changelog_1395_li
Database.checkpoint() could throw a NullPointerException.
@changelog_1378_h2
@changelog_1396_h2
Version 1.2.125 (2009-12-06)
@changelog_1379_li
@changelog_1397_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_1380_li
@changelog_1398_li
The shell tool now has a very simple statement history.
@changelog_1381_li
@changelog_1399_li
The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1382_li
@changelog_1400_li
Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1383_li
@changelog_1401_li
Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1384_li
@changelog_1402_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_1385_li
@changelog_1403_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_1386_li
@changelog_1404_li
Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1387_li
@changelog_1405_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_1388_li
@changelog_1406_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_1389_li
@changelog_1407_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_1390_li
@changelog_1408_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_1391_li
@changelog_1409_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_1392_li
@changelog_1410_li
The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1393_li
@changelog_1411_li
More bugs in the server-less multi-connection mode have been fixed.
@changelog_1394_li
@changelog_1412_li
When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1395_li
@changelog_1413_li
JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1396_li
@changelog_1414_li
User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1397_li
@changelog_1415_li
User defined functions with source code didn't work after re-opening the database.
@changelog_1398_li
@changelog_1416_li
The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1399_li
@changelog_1417_li
The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1400_li
@changelog_1418_li
Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1401_li
@changelog_1419_li
Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1402_h2
@changelog_1420_h2
Version 1.2.124 (2009-11-20)
@changelog_1403_li
@changelog_1421_li
Clustering: there is now a way to detect which cluster instances are running.
@changelog_1404_li
@changelog_1422_li
ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1405_li
@changelog_1423_li
The file lock thread is now stopped when the database is closed.
@changelog_1406_li
@changelog_1424_li
Issue 140: the Script tool now supports writing to a stream.
@changelog_1407_li
@changelog_1425_li
Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1408_li
@changelog_1426_li
Page store: new databases can not be opened with older versions.
@changelog_1409_li
@changelog_1427_li
Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1410_li
@changelog_1428_li
Page store: opening a database could theoretically result in an endless loop.
@changelog_1411_li
@changelog_1429_li
Page store: adding large indexed columns could get very slow.
@changelog_1412_li
@changelog_1430_li
Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1413_li
@changelog_1431_li
Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1414_li
@changelog_1432_li
Page store: sometimes opening a read-only database failed.
@changelog_1415_li
@changelog_1433_li
Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1416_li
@changelog_1434_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_1417_li
@changelog_1435_li
Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1418_li
@changelog_1436_li
Page store: improved auto-recovery after power failure.
@changelog_1419_li
@changelog_1437_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_1420_li
@changelog_1438_li
User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1421_li
@changelog_1439_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_1422_li
@changelog_1440_li
Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1423_li
@changelog_1441_li
Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1424_li
@changelog_1442_li
Improved read-only database detection.
@changelog_1425_h2
@changelog_1443_h2
Version 1.2.123 (2009-11-08)
@changelog_1426_li
@changelog_1444_li
Page store: new databases can not be opened with older versions.
@changelog_1427_li
@changelog_1445_li
Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1428_li
@changelog_1446_li
Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1429_li
@changelog_1447_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_1430_li
@changelog_1448_li
The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1431_li
@changelog_1449_li
The Lucene fulltext search now also returns the score.
@changelog_1432_li
@changelog_1450_li
New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1433_li
@changelog_1451_li
Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1434_li
@changelog_1452_li
Improved error messages: identifiers and values are now quoted.
@changelog_1435_li
@changelog_1453_li
Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1436_li
@changelog_1454_li
Improved support for GAE for Java thanks to Vince Bonfanti.
To start the <a href="quickstart.html#h2_console">H2 Console tool</a>, double click the jar file, or run <code>java -jar h2*.jar</code>, <code>h2.bat</code>, or <code>h2.sh</code>.
...
...
@@ -2981,7 +3035,7 @@ database.H2Platform
Downloads
@download_1001_h3
Version 1.2.145 (2010-11-02)
Version 1.3.145 (2010-11-02)
@download_1002_a
Windows Installer
...
...
@@ -6890,7 +6944,7 @@ Small footprint: around 1 MB jar file size
Download
@mainWeb_1007_td
Version 1.2.145 (2010-11-02):
Version 1.3.145 (2010-11-02) Beta:
@mainWeb_1008_a
Windows Installer (4 MB)
...
...
@@ -9809,7 +9863,7 @@ The network client should better detect if the server is not an H2 server and fa
H2 Console: support CLOB/BLOB upload.
@roadmap_1400_li
Move away from system properties where possible.
Database file name suffix: a way to use no or a different suffix (for example using a slash).
@roadmap_1401_li
Database file lock: detect hibernate / standby / very slow threads (compare system time).
...
...
@@ -9908,165 +9962,162 @@ The Shell tool should support the same built-in commands as the H2 Console.
Maybe use PhantomReference instead of finalize.
@roadmap_1433_li
Database file name suffix: a way to use no or a different suffix (for example using a slash).
@roadmap_1434_li
Database file name suffix: should only have one dot by default. Example: .h2db
@roadmap_1435_li
@roadmap_1434_li
Issue 196: Function based indexes
@roadmap_1436_li
@roadmap_1435_li
Fix the disk space leak (killing the process at the exact right moment will increase the disk space usage; this space is not re-used). See TestDiskSpaceLeak.java
@roadmap_1437_li
@roadmap_1436_li
ROWNUM: Oracle compatibility when used within a subquery. Issue 198.
@roadmap_1438_li
@roadmap_1437_li
Allow to access the database over HTTP (possibly using port 80) and a servlet in a REST way.
@roadmap_1439_li
@roadmap_1438_li
ODBC: encrypted databases are not supported because the ;CIPHER= can not be set.
@roadmap_1440_li
@roadmap_1439_li
Support CLOB and BLOB update, specially conn.createBlob().setBinaryStream(1);
@roadmap_1441_li
@roadmap_1440_li
Optimizer: index usage when both ascending and descending indexes are available. Issue 178.
@roadmap_1442_li
@roadmap_1441_li
Triggers: support user defined execution order. Oracle: CREATE OR REPLACE TRIGGER TEST_2 BEFORE INSERT ON TEST FOR EACH ROW FOLLOWS TEST_1. SQL specifies that multiple triggers should be fired in time-of-creation order. PostgreSQL uses name order, which was judged to be more convenient. Derby: triggers are fired in the order in which they were created.
@roadmap_1443_li
@roadmap_1442_li
PostgreSQL compatibility: combine "users" and "roles". See: http://www.postgresql.org/docs/8.1/interactive/user-manag.html
@roadmap_1444_li
@roadmap_1443_li
Improve documentation of system properties: only list the property names, default values, and description.
@roadmap_1445_li
@roadmap_1444_li
Support running totals / cumulative sum using SUM(..) OVER(..).
@roadmap_1446_li
@roadmap_1445_li
Improve object memory size calculation. Use constants for known VMs, or use reflection to call java.lang.instrument.Instrumentation.getObjectSize(Object objectToSize)
@roadmap_1447_li
@roadmap_1446_li
Triggers: NOT NULL checks should be done after running triggers (Oracle behavior, maybe others).
@roadmap_1448_li
@roadmap_1447_li
Common Table Expression (CTE) / recursive queries: support INSERT INTO ... SELECT ... Issue 219.
@roadmap_1449_li
@roadmap_1448_li
Common Table Expression (CTE) / recursive queries: support non-recursive queries. Issue 217.
Common Table Expression (CTE) / recursive queries: support multiple named queries. Issue 220.
@roadmap_1452_li
@roadmap_1451_li
Common Table Expression (CTE) / recursive queries: identifier scope may be incorrect. Issue 222.
@roadmap_1453_li
@roadmap_1452_li
Common Table Expression (CTE) / recursive queries: support parameters.
@roadmap_1454_li
@roadmap_1453_li
Log long running transactions (similar to long running statements).
@roadmap_1455_li
@roadmap_1454_li
Support schema specific domains.
@roadmap_1456_li
@roadmap_1455_li
Parameter data type is data type of other operand. Issue 205.
@roadmap_1457_li
@roadmap_1456_li
Some combinations of nested join with right outer join are not supported.
@roadmap_1458_li
@roadmap_1457_li
DatabaseEventListener.openConnection(id) and closeConnection(id).
@roadmap_1459_li
@roadmap_1458_li
Compatibility for data type CHAR (Derby, HSQLDB). Issue 212.
@roadmap_1460_li
@roadmap_1459_li
Compatibility with MySQL TIMESTAMPDIFF. Issue 209.
@roadmap_1461_li
@roadmap_1460_li
Optimizer: use a histogram of the data, specially for non-normal distributions.
@roadmap_1462_li
@roadmap_1461_li
Trigger: allow declaring as source code (like functions).
@roadmap_1463_li
@roadmap_1462_li
User defined aggregate: allow declaring as source code (like functions).
@roadmap_1464_li
@roadmap_1463_li
The error "table not found" is sometimes caused by using the wrong database. Add "(this database is empty)" to the exception message if applicable.
@roadmap_1465_li
@roadmap_1464_li
PostgreSQL compatibility: support escape with double \\.
@roadmap_1466_li
@roadmap_1465_li
Document the TCP server "management_db". Maybe include the IP address of the client.
@roadmap_1467_li
@roadmap_1466_li
Use javax.tools.JavaCompilerTool instead of com.sun.tools.javac.Main
@roadmap_1468_li
@roadmap_1467_li
If a database object was not found in the current schema, but one with the same name existed in another schema, included that in the error message.
@roadmap_1469_li
@roadmap_1468_li
Optimization to use an index for OR when using multiple keys: where (key1 = ? and key2 = ?) OR (key1 = ? and key2 = ?)
@roadmap_1470_li
@roadmap_1469_li
JaQu should support a DataSource and a way to create a Db object using a Connection (for multi-threaded usage with a connection pool).
@roadmap_1471_li
@roadmap_1470_li
Move table to a different schema (rename table to a different schema), possibly using ALTER TABLE ... SET SCHEMA ...;
@roadmap_1472_li
@roadmap_1471_li
nioMapped file system: automatically fall back to regular (non mapped) IO if there is a problem (out of memory exception for example).
@roadmap_1473_li
@roadmap_1472_li
Column as parameter of function table. Issue 228.
@roadmap_1474_li
@roadmap_1473_li
Connection pool: detect ;AUTOCOMMIT=FALSE in the database URL, and if set, disable autocommit for all connections.
@roadmap_1475_li
@roadmap_1474_li
Compatibility with MS Access: support "&" to concatenate text.
@roadmap_1476_li
@roadmap_1475_li
The BACKUP statement should not synchronize on the database, and therefore should not block other users.
@roadmap_1477_li
@roadmap_1476_li
Listener or authentication module for new connections, or a way to restrict the number of different connections to a tcp server, or to prevent to login with the same username and password from different IPs. Possibly using the DatabaseEventListener API, or a new API.
@roadmap_1478_li
@roadmap_1477_li
Support ALTER TABLE ADD COLUMN IF NOT EXISTS.
@roadmap_1479_li
@roadmap_1478_li
Document the database file format.
@roadmap_1480_li
@roadmap_1479_li
Support reading LOBs.
@roadmap_1481_li
@roadmap_1480_li
Require appending DANGEROUS=TRUE when using certain dangerous settings such as LOG=0, LOG=1, LOCK_MODE=0, disabling FILE_LOCK,...
@roadmap_1482_li
@roadmap_1481_li
Allow to defragment at runtime (similar to SHUTDOWN DEFRAG) in a background thread.
@roadmap_1483_h2
@roadmap_1482_h2
Not Planned
@roadmap_1484_li
@roadmap_1483_li
HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
@roadmap_1485_li
@roadmap_1484_li
String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@roadmap_1486_li
@roadmap_1485_li
In prepared statements, identifier names (table names and so on) can not be parameterized. Adding such a feature would complicate the source code without providing reasonable speedup, and would slow down regular prepared statements.
#This is a beta version. The next version will be 1.2.147. The differences between 1.2.x and 1.3.x are:
@changelog_1005_li
#In version 1.3.x, h2.lobInDatabase (store CLOB and BLOB in the database file) is enabled by default.
@changelog_1006_li
#In version 1.3.x, ANALYZE_AUTO is 2000 (automatic ANALYZE).
@changelog_1007_li
#In version 1.3.x, DB_CLOSE_ON_EXIT (the shutdown hook) is disabled by default.
@changelog_1008_li
#In version 1.3.x, DROP_RESTRICT (default action for DROP is RESTRICT) is enabled.
@changelog_1009_li
#In version 1.3.x, FUNCTIONS_IN_SCHEMA (allow to store functions in a schema) is enabled.
@changelog_1010_li
#In version 1.3.x, LARGE_TRANSACTIONS (support for very large transactions) is enabled. Changes to tables without a primary key can be buffered to disk.
@changelog_1011_li
#In version 1.3.x, MAX_MEMORY_ROWS_DISTINCT is set to a 10000.
@changelog_1012_li
#In version 1.3.x, NESTED_JOINS (nested joins and right outer joins) is enabled.
@changelog_1013_li
#In version 1.3.x, OPTIMIZE_INSERT_FROM_SELECT (speed up CREATE TABLE ... AS SELECT) is enabled.
@changelog_1014_li
#In version 1.3.x, OPTIMIZE_OR (convert OR conditions to IN(..) if possible) is enabled.
@changelog_1015_li
#In version 1.3.x, QUERY_CACHE_SIZE is enabled.
@changelog_1016_li
#In version 1.3.x, SELECT_FOR_UPDATE_MVCC (MVCC and SELECT FOR UPDATE) is enabled.
@changelog_1017_li
#In version 1.3.x, RUNSCRIPT and SCRIPT (commands and tools), use UTF-8 by default (ScriptCommand.charset).
@changelog_1018_li
#In version 1.3.x, Lucene 3 is used by default. Issue 147.
@changelog_1019_li
#When the system property h2.lobInDatabase is set, the lob tables were always created when closing the database, even if the tables were not needed.
@changelog_1020_li
#In the MySQL mode, SHOW TABLES didn't work, and meta data tables were not case insensitive. Updatable result sets didn't work as expected. Issue 249.
@changelog_1003_li
@changelog_1021_li
#Connection-created Clob and Blob objects can now be filled using Clob.setCharacterStream(1), Clob.setString(1, s), Blob.setBytes(1, x), Blob.setBinaryStream(1). Issue 235.
@changelog_1004_li
@changelog_1022_li
#Trying to convert a very small CLOB to a BLOB or a very small CLOB to a BLOB threw a NullPointerException.
@changelog_1005_li
@changelog_1023_li
#INFORMATION_SCHEMA.SETTINGS: now the current page count can be queried using select * from information_schema.settings where name = 'info.PAGE_COUNT'.
@changelog_1006_li
@changelog_1024_li
#For an invalid value exception, the parameter name and value was switched in some cases.
@changelog_1007_li
@changelog_1025_li
#When using trace level 3, opening a database no longer prints there is a EOFException (because that is the expected behavior).
@changelog_1008_li
@changelog_1026_li
#CALL calling a Java function with return type ResultSet and return value null threw a ClassCastException.
@changelog_1009_li
@changelog_1027_li
#SELECT ... FROM CSVREAD no longer creates a temporary file. Some large imports are now twice as fast.
@changelog_1010_h2
@changelog_1028_h2
#Version 1.2.145 (2010-11-02)
@changelog_1011_li
@changelog_1029_li
#A new String cache is now created at most once every 5 second, so that out of memory exceptions are not artificially delayed.
@changelog_1012_li
@changelog_1030_li
#After closing a database, the writer thread will stop after 100 ms at the latest (instead of 1 second).
@changelog_1013_li
@changelog_1031_li
#Opening a large database could fail in theory if the process was killed and then not fully compacted (because the unique transaction log key was re-used).
@changelog_1014_li
@changelog_1032_li
#Views now store the schema for Java functions if "functions in schemas" is enabled (system property h2.functionsInSchema).
@changelog_1015_li
@changelog_1033_li
#Improved error message if the LOB files are already deleted on the client side.
@changelog_1016_li
@changelog_1034_li
#Closing a Statement or PreparedStatement at the same time as executing a statement could throw a strange exception. Issue 241.
@changelog_1017_li
@changelog_1035_li
#The Recover tool did not work with compressed lob files (set compress_lob lzf). Also, sometimes the Recover tool was very slow, specially using a 64-bit JVM, because it tried to de-compress lob files even if they were not compressed (which could allocate a lot of memory).
@changelog_1018_li
@changelog_1036_li
#H2 Console: webAllowOthers and webSSL were swapped if they didn't exist in the properties file. Issue 244.
@changelog_1019_li
@changelog_1037_li
#When the system property h2.lobInDatabase is set, CREATE TABLE ... AS SELECT with a LOB column did not always work.
@changelog_1020_li
@changelog_1038_li
#Some system properties are not supported any longer, because they can already be set in the database URL. The constants are: CACHE_SIZE_DEFAULT, CACHE_TYPE_DEFAULT, DEFAULT_LOCK_MODE, LOCK_MODE_READ_COMMITTED, DEFAULT_MAX_LENGTH_INPLACE_LOB, DEFAULT_MAX_LENGTH_INPLACE_LOB2, DEFAULT_MAX_MEMORY_UNDO, DEFAULT_MAX_OPERATION_MEMORY, DEFAULT_PAGE_SIZE, DEFAULT_RESULT_SET_CONCURRENCY, MIN_WRITE_DELAY.
@changelog_1021_li
@changelog_1039_li
#Various system properties have been replaced with database level settings: ALIAS_COLUMN_NAME, ANALYZE_AUTO, ANALYZE_SAMPLE, DATABASE_TO_UPPER, DEFAULT_ESCAPE, DEFRAG_ALWAYS, DROP_RESTRICT, ESTIMATED_FUNCTION_TABLE_ROWS, FUNCTIONS_IN_SCHEMA, LARGE_RESULT_BUFFER_SIZE, LARGE_TRANSACTIONS, MAX_COMPACT_COUNT, MAX_COMPACT_TIME, MAX_MEMORY_ROWS_DISTINCT, MAX_QUERY_TIMEOUT, NESTED_JOINS, OPTIMIZE_DISTINCT, OPTIMIZE_EVALUATABLE_SUBQUERIES, OPTIMIZE_INSERT_FROM_SELECT, OPTIMIZE_IN_LIST, OPTIMIZE_IS_NULL, OPTIMIZE_OR, OPTIMIZE_SUBQUERY_CACHE, OPTIMIZE_TWO_EQUALS, OPTIMIZE_UPDATE, PAGE_STORE_INTERNAL_COUNT, PAGE_STORE_TRIM, QUERY_CACHE_SIZE, RECOMPILE_ALWAYS, RECONNECT_CHECK_DELAY, SELECT_FOR_UPDATE_MVCC, SHARE_LINKED_CONNECTIONS. See the Javadoc documentation of DbSettings for details. The system properties are still supported for backward compatibility.
@changelog_1022_li
@changelog_1040_li
#When the system property h2.nestedJoins was enabled, some outer joins returned the wrong result.
@changelog_1023_li
@changelog_1041_li
#Opening a database could throw a NullPointerException.
@changelog_1024_li
@changelog_1042_li
#After a crash, the database file did not always shrink because old transaction log pages were not removed from the file.
@changelog_1025_li
@changelog_1043_li
#Various CallableStatement methods could throw a NullPointerException.
@changelog_1026_li
@changelog_1044_li
#LOB files were not deleted when running DROP ALL OBJECTS.
@changelog_1027_li
@changelog_1045_li
#MS SQL Server compatibility: support "N" in front of string literals ("National Language" strings). Issue 240.
@changelog_1028_li
@changelog_1046_li
#CAST: when converting a string to binary, it is hex encoded (every byte two characters); a hex string can be converted to a number by first converting it to binary. Examples: CAST(CAST('FFFF' AS BINARY) AS INT) = 65535, CAST(65535 AS BINARY) = '0000FFFF'.
@changelog_1029_li
@changelog_1047_li
#When a domain (user defined data type) contained a user defined function, the database could not be opened.
@changelog_1030_li
@changelog_1048_li
#CAST('011' AS INT) will no longer use decode the value as an octal number (using Integer.decode) but now use Integer.parseInt. The same logic applied to byte, short, and long. This also means that trying to convert hex numbers (0x...) with CAST now fails.
@changelog_1031_li
@changelog_1049_li
#A table in the Recover tool script could not be imported if the script contained duplicate keys.
@changelog_1032_h2
@changelog_1050_h2
#Version 1.2.144 (2010-10-15)
@changelog_1033_li
@changelog_1051_li
#The Windows .bat files did not contain CR+LF.
@changelog_1034_li
@changelog_1052_li
#The LOB storage (when the system property h2.lobInDatabase is set) is now only initialized when needed.
@changelog_1035_li
@changelog_1053_li
#The index condition columnName IS NULL was not efficient when using a clustered index.
@changelog_1036_li
@changelog_1054_li
#The Recover tool did not work for databases larger than 2 GB.
@changelog_1037_li
@changelog_1055_li
#In memory database: outer joins with a condition "column is null" could return the wrong result.
@changelog_1038_li
@changelog_1056_li
#Temporary files were not created in the temporary directory of the system, but in the current working directory. This affected temporary undo log files for read-only databases, temporary files for large result sets when using read-only databases, and temporary LOB files when storing LOBs in the database (system property h2.lobInDatabase). When the setting h2.lobInDatabase is not set, temporary LOB files are still stored in a sub-directory (.lobs.db/) of the current working directory.
@changelog_1039_li
@changelog_1057_li
#New experimental feature to speed up CREATE TABLE ... AS SELECT. To enable the feature, set the system property h2.optimizeInsertFromSelect to true. For large queries, performance can be doubled.
@changelog_1040_li
@changelog_1058_li
#When LOB objects are stored in the database (using the experimental setting h2.lobInDatabase), and using the MVCC mode, opening a database with uncommitted transactions could throw a NullPointerException.
@changelog_1041_li
@changelog_1059_li
#Support of stored procedures with OUT parameters in CallableStatement is implemented.
@changelog_1042_li
@changelog_1060_li
#PreparedStatement.getMetaData() was not always consistent with resulting ResultSet.getMetaData().
@changelog_1043_li
@changelog_1061_li
#The build tool now uses JAVA_HOME for javac as well. Issue 233.
@changelog_1044_li
@changelog_1062_li
#Opening and closing encrypted databases is now much faster.
@changelog_1045_li
@changelog_1063_li
#H2 Console: new experimental feature to support file download and upload, but only if there is a directory called "transfer" in the current working directory. For security reasons, only very simple file names are supported. Sub-directories are not supported. To upload, use transfer.jsp; to download, use transfer/fileName.
@changelog_1046_li
@changelog_1064_li
#A new sample application that shows how to manually create an encrypted and compressed script file.
@changelog_1047_li
@changelog_1065_li
#Performance has been improved a bit.
@changelog_1048_li
@changelog_1066_li
#DatabaseMetaData.getJDBCMajorVersion now returns 4 (instead of 3) when the driver is compiled with Java 6 (the default).
@changelog_1049_li
@changelog_1067_li
#Re-added the internal utility class BitField which improves performance of opening and closing a database (because it supports setByte / getByte, unlike java.util.BitSet).
@changelog_1050_li
@changelog_1068_li
#INFORMATION_SCHEMA.SESSIONS: the start time of a SQL statement is no longer set in each case. It is only set for long running statements. This change should improve performance a bit on some devices, specially when using Android.
@changelog_1051_li
@changelog_1069_li
#A old databases without user name and password (created with H2 version 1.2.142 or older) couldn't be opened with version 1.2.143. Fixed.
@changelog_1052_li
@changelog_1070_li
#The database upgrade classes have been renamed.
@changelog_1053_li
@changelog_1071_li
#The database did not automatically upgrade when using a connection pool or data source.
@changelog_1054_li
@changelog_1072_li
#JaQu: a database object can now also be created using a DataSource. Issue 227.
@changelog_1055_li
@changelog_1073_li
#The built-in profiler now better supports the Dalvik VM.
@changelog_1056_li
@changelog_1074_li
#The jarSmall build target no longer includes assertions (SysProperties.CHECK, CHECK2, system properties h2.check and h2.check2).
@changelog_1057_li
@changelog_1075_li
#The jarSmall build target excluded the DbUpgrade classes by mistake.
@changelog_1058_h2
@changelog_1076_h2
#Version 1.2.143 (2010-09-18)
@changelog_1059_li
@changelog_1077_li
#If the user name and password are not set or empty, then the password is not hashed. To disable this behavior, set the system property h2.emptyPassword to false. TCP server: the default user name for the management database is now an empty string.
@changelog_1060_li
@changelog_1078_li
#Cluster: auto-commit was disabled after opening a connection.
@changelog_1061_li
@changelog_1079_li
#Connection.getAutoCommit() is now much faster, specially when using the server mode.
@changelog_1062_li
@changelog_1080_li
#Statement.cancel() had no effect when using the server mode.
@changelog_1063_li
@changelog_1081_li
#SCRIPT: the SQL script no longer contains settings that match the default value.
@changelog_1064_li
@changelog_1082_li
#Statement.cancel() did not work when running RUNSCRIPT and SCRIPT.
@changelog_1065_li
@changelog_1083_li
#Statement.cancel() could cause a NullPointerException.
@changelog_1066_li
@changelog_1084_li
#In some cases (specially when using a small cache size or a large database over 1 GB) for some operations like ALTER TABLE the data was written before the transaction log entries, which could cause a corrupt database if the process was killed during the ALTER TABLE operation. Thanks a lot to Victor Pyankov for helping solve this problem!
@changelog_1067_li
@changelog_1085_li
#The Recover tool could throw a ArrayIndexOutOfBoundsException when trying to recover a corrupt database file.
@changelog_1068_li
@changelog_1086_li
#The SCRIPT command and tool now uses the default file encoding for the system now instead of UTF-8 (as before). In most cases, this will not affect existing applications, as the encoding only affects how SQL identifiers (table names and so on) that contain special characters are stored. Table data is escaped, and therefore is no problem.
@changelog_1069_li
@changelog_1087_li
#The SCRIPT command and tool now also support the CHARSET option (like RUNSCRIPT).
@changelog_1070_li
@changelog_1088_li
#When closing a database, sometimes empty space in the database was not freed up.
@changelog_1071_li
@changelog_1089_li
#Trying to create a view with parameters in the query will now throw an exception. So far, creating the view was allowed, but the parameter value was not used (null was used instead).
@changelog_1072_li
@changelog_1090_li
#New experimental feature SHUTDOWN DEFRAG. This option re-orders the pages while closing the database so that table scans are faster.
@changelog_1073_li
@changelog_1091_li
#When using the MULTI_THREADED option, concurrently reading from a database (specially from a larger database, or when using a small cache size) could throw an exception.
@changelog_1074_li
@changelog_1092_li
#When adding a comment to a column that has a check constraint, the database couldn't be re-opened.
@changelog_1075_li
@changelog_1093_li
#New system property h2.lobClientMaxSizeMemory to set the maximum size of a LOB object to keep in memory on the client side when using the server mode.
@changelog_1076_h2
@changelog_1094_h2
#Version 1.2.142 (2010-08-31)
@changelog_1077_li
@changelog_1095_li
#Documentation for using H2 on Android devices has been added under Tutorial - Android.
@changelog_1078_li
@changelog_1096_li
#An ArrayIndexOutOfBoundsException was thrown when querying the table information_schema.function_aliases while there are any user defined aggregate functions.
@changelog_1079_li
@changelog_1097_li
#The jar files are now about 50 KB smaller. In the last few versions they contained superfluous classes.
@changelog_1080_li
@changelog_1098_li
#The default time to compact a database when closing (system property h2.maxCompactTime) is now 0.2 seconds instead of 1 second.
@changelog_1081_li
@changelog_1099_li
#Opening an closing a database is now faster.
@changelog_1082_li
@changelog_1100_li
#In theory, when using indexes with large index rows (or when using a very small page size), removing rows could throw an internal exception in some cases.
@changelog_1083_li
@changelog_1101_li
#Inserting rows in reverse order could throw an ArrayIndexOutOfBoundsException in some cases (specially rows larger than the page size, which is 2 KB by default). Issue 226.
@changelog_1084_li
@changelog_1102_li
#H2 Console: with Chrome and Safari, resizing the table/query frame doesn't work. Issue 225.
@changelog_1085_li
@changelog_1103_li
#New experimental database file locking mechanism "FS" to use native file locking (no *.lock.db file is created in this case, and no background thread is started). This mechanism may not work on all systems (on some systems it's possible to lock the same file multiple times within the same virtual machine, and on some system native file locking is not working or unlocking is not working).
@changelog_1086_h2
@changelog_1104_h2
#Version 1.2.141 (2010-08-22)
@changelog_1087_li
@changelog_1105_li
#New experimental pseudo-encryption algorithm "FOG". It makes the data appear to be encrypted. This algorithm is cryptographically extremely weak, and should only be used to hide data from reading the plain text using a text editor. Please let us know if you think this is useful or not.
@changelog_1088_li
@changelog_1106_li
#Documentation: the grammar and function documentation can now be easier translated.
@changelog_1089_li
@changelog_1107_li
#Password hash: in addition to connecting with the plain text password, H2 now supports connecting with the password hash. Like this you don't have to store plain text passwords in config files. For details, see the documentation at Advanced / Password Hash.
@changelog_1090_li
@changelog_1108_li
#Lucene 3.x support was added in the source code, however it is not yet enabled by default and is not yet supported when using the default h2 jar file. To enable Lucene 3.x support, the source code of H2 needs to be switched using <code>./build.sh -Dlucene=3 switchSource</code>, and then re-compile. To switch the source code back use <code>./build.sh -Dlucene=2 switchSource</code> (replace ./build.sh with build.bat on Windows). The plan is to use Lucene 3 by default in H2 version 1.3.x. Issue 147.
@changelog_1091_li
@changelog_1109_li
#The native fulltext search could cause a Java level deadlock if searching from multiple connections concurrently.
@changelog_1092_li
@changelog_1110_li
#CREATE FORCE VIEW didn't work in most cases if a referenced table didn't exist.
@changelog_1093_li
@changelog_1111_li
#MVCC: when trying to insert two rows with the same key from two connections, the second connection immediately threw the exception "Unique index or primary key violation". Instead, the second connection now waits throwing the exception until the first connection committed the change (same as when trying to concurrently update the same row).
@changelog_1094_li
@changelog_1112_li
#Server mode: if the client ran with a different timezone setting than the server, date values got shifted by the difference between the timezones. This problem affected the data types DATE, TIME, and TIMESTAMP, when using PreparedStatement.setDate / setTime / setTimestamp and ResultSet.getDate / getTime / getTimestamp. To solve the problem, both the client and the server need to be updated (otherwise the old transfer protocol is used).
@changelog_1095_li
@changelog_1113_li
#The built-in connection pool (JdbcConnectionPool) did not always honor the login timeout (the timeout could occur much too early). Thanks a lot to Dario Fassi for the patch!
@changelog_1096_li
@changelog_1114_li
#Translation: the new messages have been translated to Spanish. Thanks a lot to Dario Fassi!
@changelog_1097_li
@changelog_1115_li
#The table INFORMATION_SCHEMA.SETTINGS now contains all H2-specific system properties (the ones that start with "h2.") and that are explicitly set. Previously, some H2-specific settings (for example h2.analyzeAuto) were missing in this list.
@changelog_1098_li
@changelog_1116_li
#EXPLAIN ANALYZE with an in-memory database threw an exception. Issue 216.
@changelog_1099_li
@changelog_1117_li
#Data modifications (inserts, updates, and deletes) are now up to 5 times faster because converting objects to byte arrays is avoided if possible.
@changelog_1100_li
@changelog_1118_li
#LOG=0 is now a bit faster (previously undo log entries were still written).
@changelog_1101_li
@changelog_1119_li
#The command line tools now say so if the source directory of an option doesn't exist.
@changelog_1102_li
@changelog_1120_li
#It is now allowed to truncate a table if referential integrity has been disabled for this table or database.
@changelog_1103_li
@changelog_1121_li
#For unencrypted databases, the automatic upgrade temporary script file is now unencrypted again.
@changelog_1104_h2
@changelog_1122_h2
#Version 1.2.140 (2010-07-25)
@changelog_1105_li
@changelog_1123_li
#The default MAX_LOG_SIZE is now 16 MB instead of 2 MB. Some uses cases are 3 times faster now.
@changelog_1106_li
@changelog_1124_li
#Improved cache memory usage calculation.
@changelog_1107_li
@changelog_1125_li
#Only resources that are actually used are loaded in memory. This can reduce the memory usage by about 400 KB.
@changelog_1108_li
@changelog_1126_li
#Profiling: the jar file can now be installed as an agent using java -javaagent:h2*.jar - this was be used to more accurately calculate the memory footprint of the cache. It has no effect when using H2 (using this feature in an application is not needed and not recommended).
@changelog_1109_li
@changelog_1127_li
#The cache was not used efficiently when reading (behaving like a FIFO cache instead of an LRU cache).
@changelog_1110_li
@changelog_1128_li
#Storing lobs in the database has been changed. It is now faster. Unfortunately, the change is not backward compatible; if you have used h2.lobInDatabase before you will need to re-build the database.
@changelog_1111_li
@changelog_1129_li
#SHUTDOWN COMPACT is now faster.
@changelog_1112_li
@changelog_1130_li
#H2 Console: requesting the status did not always show the window on top of others.
@changelog_1113_li
@changelog_1131_li
#H2 Console: on some system, the browser windows got opened when requesting a new one.
@changelog_1114_li
@changelog_1132_li
#The built-in profiling tool now uses a default stack depth of 32 elements and a default interval of 10 ms.
@changelog_1115_li
@changelog_1133_li
#Database files now grows in 1 MB blocks (and at least 20% at a time), instead of always 256 KB. This speeds up loading a new database.
@changelog_1116_li
@changelog_1134_li
#H2 Console: new built-in command @sleep to help profile another session.
@changelog_1117_li
@changelog_1135_li
#For improved performance, LOG=0 and LOG=1 are again supported. LOG=0 means the transaction log is disabled completely (fastest; for loading a database). LOG=1 means the transaction log is enabled, but FileDescriptor.sync is disabled (if no protection against power failure is required). LOG=2 is the default (transaction log is enabled, FileDescriptor.sync for each checkpoint).
@changelog_1118_li
@changelog_1136_li
#After deleting a lot of data (for example by dropping or altering tables, or indexes, or after a large transaction), opening a large database was very slow. Fixed.
@changelog_1119_li
@changelog_1137_li
#When killing the process after creating and dropping many tables (specially temporary tables), the database could not be opened sometimes.
@changelog_1120_li
@changelog_1138_li
#CAST(NULL AS ...) doesn't forget the data type, precision, and scale any longer.
@changelog_1121_li
@changelog_1139_li
#Experimental support for recursive queries (see 'Advanced' - 'Recursive Queries' for details).
@changelog_1122_li
@changelog_1140_li
#Problems with JDK 1.6.0_18 have been reports in the class StringUtils.quoteRemarkSQL. This method is now changed.
@changelog_1123_li
@changelog_1141_li
#The "small jar" distribution did not include the CompressTool, which was required for some operations. Fixed.
@changelog_1124_li
@changelog_1142_li
#The build tool now supports (minimalistic) shell mode, started using ./build.sh -
@changelog_1125_li
@changelog_1143_li
#IS NULL comparison with nested queries and linked tables did not work. Example: select * from (select x from test) where x is null.
@changelog_1126_li
@changelog_1144_li
#Support for null-safe equals. This includes the ANSI SQL standard syntax A IS [NOT] DISTINCT FROM B as well as the shorter A IS [NOT] B.
@changelog_1127_li
@changelog_1145_li
#Primary key violations threw a strange exception message when using a single column INT or BIGINT key.
@changelog_1128_li
@changelog_1146_li
#EXPLAIN ANALYZE now also lists the number of pages read from the file.
@changelog_1129_li
@changelog_1147_li
#Memory mapped files: There was a bug in version 1.2.139 so that memory mapped files could only be used together with split, for example: split:nioMapped: - the problem is now solved. It is still a good idea to use split:nioMapped: to work around the 2 GB limitation of memory mapped files.
@changelog_1130_li
@changelog_1148_li
#Memory mapped files: the system property h2.nioCleanerHack is now disabled by default because it was not always working as expected. Now System.gc() is used in a loop until the buffer is garbage collected. This of course is also not a nice solution, but the only one known to work. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038
@changelog_1131_li
@changelog_1149_li
#Bugfixes for the automatic 1.1 db migration.
@changelog_1132_li
@changelog_1150_li
#If an old 1.1 database file version is found on connect, it is now possible to let the old h2 classes (v 1.2.128) connect to the database. The automatic upgrade .jar file must be present, and the url must contain NO_UPGRADE=TRUE
@changelog_1133_li
@changelog_1151_li
#The automatic upgrade temporary script file is now encrypted.
@changelog_1134_h2
@changelog_1152_h2
#Version 1.2.139 (2010-07-10)
@changelog_1135_li
@changelog_1153_li
#There was a bug in the internal IntIntHashMap. There were no known side effects however.
@changelog_1136_li
@changelog_1154_li
#ANALYZE now uses less memory.
@changelog_1137_li
@changelog_1155_li
#Memory mapped file system: improved error messages if there is a problem.
@changelog_1138_li
@changelog_1156_li
#The Lucene fulltext search did not work well when using special file systems such as split or nioMapped.
@changelog_1139_li
@changelog_1157_li
#The memory mapped file system (nioMapped: file prefix) couldn't seek past the file length.
@changelog_1140_li
@changelog_1158_li
#Some file system operations did not work with stacked file systems (for example split and nioMapped). This also affected the DeleteDbFiles tool.
@changelog_1141_li
@changelog_1159_li
#New experimental query cache. The cache is only used if the SQL statement and all parameters match. Each session has it's own cache with the given size. Only the last returned result per query is cached. Only SELECT statements are cached (excluding UNION and FOR UPDATE statements). This works for both statements and prepared statement. To enable, set the system property h2.commandCacheSize to a value larger than 0. There is currently no plan to enable this option by default in future versions.
@changelog_1142_li
@changelog_1160_li
#Conditions with many OR operations could throw an UnsupportedOperationException if h2.optimizeOr was enabled.
@changelog_1143_li
@changelog_1161_li
#XA connection: after transaction commit or rollback, the physical connection is set into autocommit mode.
@changelog_1144_li
@changelog_1162_li
#MULTI_THREADED did not work correctly and could throw the exception "try to add a record twice" for larger databases because cache access was not correctly synchronized.
@changelog_1145_li
@changelog_1163_li
#Automatic database upgrade from non page store is now possible. If the classes from the h2mig_pagestore_addon.jar file are in the classpath, the database will be converted to the current page store format automatically. The file can be found here: <a href="http://h2database.com/h2mig_pagestore_addon.jar">http://h2database.com/h2mig_pagestore_addon.jar</a>
@changelog_1146_li
@changelog_1164_li
#The MultiDimension tools was extended with a few helper methods. The API was unified a bit.
@changelog_1147_li
@changelog_1165_li
#ODBC: MS Access could not link to a table with unique index or primary key. To solve this problem, index meta data is currently disabled for ODBC. When using the new H2 version to access a database over ODBC, the PostgreSQL catalog is automatically upgraded. Using a database with an upgraded PostgreSQL catalog with an older version of H2 is still possible, but not over ODBC.
@changelog_1148_li
@changelog_1166_li
#ODBC: MS Access could not link to a table with a name containing '_'.
@changelog_1149_li
@changelog_1167_li
#ODBC: additional connection settings can now be added to the database name. Example: ~/test;cipher=xtea. Therefore, encrypted databases are supported.
@changelog_1150_li
@changelog_1168_li
#Local temporary tables can now be created without having to commit a transaction using CREATE LOCAL TEMPORARY TABLE TEMP(ID INT PRIMARY KEY) TRANSACTIONAL.
@changelog_1151_li
@changelog_1169_li
#New system property h2.dropRestrict (default false) to change the default action for DROP TABLE and DROP VIEW (false for CASCADE, true for RESTRICT). The plan is to enable this property by default in version 1.3.x.
@changelog_1152_li
@changelog_1170_li
#DROP TABLE now also supports CASCADE (still the default) and RESTRICT.
@changelog_1153_li
@changelog_1171_li
#The wrong exception was thrown when trying to connect to a server if the server was not running.
@changelog_1154_li
@changelog_1172_li
#UNION queries where the first query contains a nested query were parsed incorrectly. Example: "select 1 from (select 2 from dual) union select 3 from dual" was parsed as "select 1 from ((select 2 from dual) union select 3 from dual)". Fixed.
@changelog_1155_li
@changelog_1173_li
#Support ALTER SCHEMA name RENAME TO newName (rename schema). (patch from Kerry Sainsbury)
@changelog_1156_h2
@changelog_1174_h2
#Version 1.2.138 (2010-06-27)
@changelog_1157_li
@changelog_1175_li
#Referential integrity: it was not allowed to delete a row with NULL in the parent table, if there was a row with NULL in the child table.
@changelog_1158_li
@changelog_1176_li
#Experimental feature to support case sensitive catalog names and database names using the DATABASE() method. To use this feature, set the system property h2.databaseToUpper to false. The plan is to set the property to false by default in version 1.3.x. Issue 204 - thanks to Sylvain Cuaz (ILM Informatique) for the patch.
@changelog_1159_li
@changelog_1177_li
#Experimental feature to support nested joins. To enable, set the system property h2.nestedJoins to true. If enabled, nested joins and right outer joins should work as expected (issues 145, 177, and 203). The plan is to enable this feature by default in version 1.3.x.
#When creating functions within a schema, those functions could not be used in views, nested queries, and constraints. Fixed.
@changelog_1162_li
@changelog_1180_li
#The benchmarks have been run using recent database versions.
@changelog_1163_li
@changelog_1181_li
#Version 1.2.137 could still not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision).
@changelog_1164_li
@changelog_1182_li
#Cluster: non-admin users could not connect when one of the cluster node was stopped. Issue 206.
@changelog_1165_li
@changelog_1183_li
#DROP VIEW now supports the CASCADE and RESTRICT clauses (patch from Kerry Sainsbury)
@changelog_1166_li
@changelog_1184_li
#CREATE VIEW now supports the OR REPLACE clause (patch from Kerry Sainsbury)
@changelog_1167_li
@changelog_1185_li
#Build tool: ability to only run one test using the -Dtest=className setting. eg: build -Dtest=org.h2.test.db.TestViewDropView test (patch from Kerry Sainsbury).
@changelog_1168_h2
@changelog_1186_h2
#Version 1.2.137 (2010-06-06)
@changelog_1169_li
@changelog_1187_li
#Statements with a nested query and a condition that was always NULL threw an IndexOutOfBoundsException. Example: select * from (select null as x) where x=1
@changelog_1170_li
@changelog_1188_li
#The changes that were made to support large transactions also fixed a bug with large transactions (when the undo log file size is larger than 2 GB).
@changelog_1171_li
@changelog_1189_li
#Experimental feature to support very large transactions (except when using MVCC). To enable, set the system property h2.largeTransactions to true. If enabled, changes to tables without a primary key can be buffered to disk. The plan is to enable this feature by default in version 1.3.x.
@changelog_1172_li
@changelog_1190_li
#H2 Console: editing result sets is now also working for database other than H2, if they do support updatable result sets. Add "@edit" before the query. Only limited testing has been done on this feature, some data types may not work (please provide feedback if you find issues).
@changelog_1173_li
@changelog_1191_li
#Cluster: an open transaction was committed when a cluster node was stopped (because disabling the cluster executes SET CLUSTER '', which committed the transaction). Transaction are no longer committed when calling SET CLUSTER. Issue 199.
@changelog_1174_li
@changelog_1192_li
#Cluster: non-admin users couldn't connect to the cluster and couldn't disable the cluster. Issue 201.
@changelog_1175_li
@changelog_1193_li
#Cluster: NEXTVAL('sequence') was only called on one cluster node, therefore sequence values could get out of sync.
@changelog_1176_li
@changelog_1194_li
#Version 1.2.136 could not be converted to Java 1.4 (because the Retrotranslator doesn't support BigDecimal.precision). A workaround has been implemented.
@changelog_1177_li
@changelog_1195_li
#The error code of IO exceptions in CSV functions was incorrect.
@changelog_1178_li
@changelog_1196_li
#The TriggerPassData example now uses a prefix (the database name).
@changelog_1179_li
@changelog_1197_li
#The wrong exception was thrown when trying to reference a table that doesn't support references such as a table in the information schema.
@changelog_1180_li
@changelog_1198_li
#Server.shutdownTcpServer can now stop all TCP servers on this JVM.
@changelog_1181_li
@changelog_1199_li
#JdbcConnectionPool: the default connection timeout is now 30 seconds (it used to be 5 minutes).
@changelog_1182_li
@changelog_1200_li
#LOB storage: LOBs added with "h2.lobInDatabase" enabled couldn't be read later with this option disabled.
@changelog_1183_h2
@changelog_1201_h2
#Version 1.2.136 (2010-05-24)
@changelog_1184_li
@changelog_1202_li
#When using ORDER BY and there are both ascending and descending indexes, the database used the first index even when the second one could be used for sorting.
@changelog_1185_li
@changelog_1203_li
#Conditions of the form columnName IS NULL now use an index. To disable this feature, set the system property h2.optimizeIsNull to false.
@changelog_1186_li
@changelog_1204_li
#H2 Console: when the settings were not stored yet (for example when running for the first time), the last recently used settings were not stored. A workaround was to create the file ".h2.server.properties" manually in the current user home directory, with the contents: webAllowOthers=false, webPort=8082, webSSL=false, 0=Generic H2 (Embedded)|org.h2.Driver|jdbc\:h2\:~/test|sa (where a comma is a newline).
@changelog_1187_li
@changelog_1205_li
#The source code is now switched to Java 6 (JDK 1.6) by default. Java 5 (JDK 1.5) is still supported, and the jar file is still compiled for Java 5.
@changelog_1188_li
@changelog_1206_li
#The BOM (the byte-order-mark) character 0xfeff at the beginning of the file is ignored. This is for compatibility with Microsoft Excel.
@changelog_1189_li
@changelog_1207_li
#When opening an existing database, the cache size is set to at most half the amount of memory available for the virtual machine (Runtime.getRuntime().maxMemory()), even if the cache size setting stored in the database is larger. Setting the cache size in the database URL or explicitly using SET CACHE_SIZE overrides this value (even if larger than the physical memory).
@changelog_1190_li
@changelog_1208_li
#INFORMATION_SCHEMA.SETTINGS: the cache size is now returned in KB.
@changelog_1191_li
@changelog_1209_li
#New system property h2.selectForUpdateMvcc, the default is false (the feature is disabled). When enabled, SELECT ... FOR UPDATE only locks the selected rows in the MVCC mode. Aggregate or GROUP BY queries are not allowed in this case.
@changelog_1192_li
@changelog_1210_li
#Profiler: improved message if there was no stack trace.
@changelog_1193_li
@changelog_1211_li
#The H2 Console can now be used within another application, in a frame or iframe. Issue 197.
@changelog_1194_li
@changelog_1212_li
#Recover tool: the statistics section now includes page type counts again.
@changelog_1195_li
@changelog_1213_li
#Queries with multiple IN(...) conditions sometimes return the wrong results when there was a multi-column index for the column.
@changelog_1196_li
@changelog_1214_li
#Queries with IN(..., NULL) did sometimes return the wrong results when there was a index for the column.
@changelog_1197_li
@changelog_1215_li
#DECIMAL: faster precision and memory usage calculations.
@changelog_1198_li
@changelog_1216_li
#A new class org.h2.tools.TriggerAdapter allows to use the ResultSet interface within trigger implementations.
@changelog_1199_li
@changelog_1217_li
#A subselect which used an index could lead to wrong results. Fixed.
@changelog_1200_li
@changelog_1218_li
#Creating a cached temporary non persistent table with a primary key threw a NullPointerException.
@changelog_1201_h2
@changelog_1219_h2
#Version 1.2.135 (2010-05-08)
@changelog_1202_li
@changelog_1220_li
#Temporary files were not deleted when using large transactions, disabling autocommit, and closing the session without committing.
@changelog_1203_li
@changelog_1221_li
#Queries using multiple IN(..) conditions on the same table could cause repeated rows in the result set.
@changelog_1204_li
@changelog_1222_li
#Translation: Lubomir Grajciar translated the H2 Console as well as all error message to Slovensky. Thanks a lot!
@changelog_1205_li
@changelog_1223_li
#There was a possible Java level deadlock when opening an uninitialized database and using a file system that also opened a database.
@changelog_1206_li
@changelog_1224_li
#When killing the process while the database was writing a checkpoint, while it was closing, or while running recovery (while removing temporary tables from a previous run), the database could become corrupt. A new test case has been implemented to ensure such problems can not occur in the future.
@changelog_1207_li
@changelog_1225_li
#File system: new method FileSystem.setReadOnly.
@changelog_1208_li
@changelog_1226_li
#The page size for new databases can now be set in the database URL using ;PAGE_SIZE=512. Currently this feature is only used to simplify testing.
@changelog_1209_li
@changelog_1227_li
#New system property h2.functionsInSchema (default is false). If enabled, the SCRIPT statement always includes the schema name in the CREATE ALIAS statement (even if the schema is PUBLIC). This is not backward compatible with H2 versions 1.2.134 and older.
@changelog_1210_li
@changelog_1228_li
#Functions: it is no longer required to add a space after a comma in the parameter list. Example: CREATE ALIAS PARSE_INT FOR "java.lang.Integer.parseInt(java.lang.String,int)"
@changelog_1211_li
@changelog_1229_li
#Functions now reside within a schema, similar to sequences. If you do create such functions in schemas other than PUBLIC, then the database can not be opened with older versions of H2.
@changelog_1212_li
@changelog_1230_li
#Cluster: after a cluster node failed, the second cluster node can now be re-created and started without having to stop the first cluster node, and without having to stop running applications. To do that, append ;AUTO_RECONNECT=TRUE to the database URL.
@changelog_1213_li
@changelog_1231_li
#Auto-reconnect: if another connection uses the database in exclusive mode then this connection will try to re-connect until the exclusive mode ends. This is important when using the cluster mode.
@changelog_1214_li
@changelog_1232_li
#SET EXCLUSIVE now supports 0 (disable), 1 (enable), and 2 (enable and close all other connections).
@changelog_1215_li
@changelog_1233_li
#Installing the H2 as a service should now work on Windows 7. The batch files now explicitly set the directory using pushd "%~dp0".
@changelog_1216_li
@changelog_1234_li
#Temporary tables can now be 'cached', that means indexes of temporary tables can be persisted. This enables very large temporary tables (both local and global).
@changelog_1217_li
@changelog_1235_li
#The CreateCluster tool now sets the source database in exclusive mode before copying data to the new database.
@changelog_1218_li
@changelog_1236_li
#The H2 Console now stream results one statement / result set at a time (using chunked transfer encoding). To disable, set the system property h2.consoleStream to false. This feature is not supported when using a servlet container.
@changelog_1219_li
@changelog_1237_li
#The H2 Console did not call the CreateCluster tool with the correctly escaped parameters.
@changelog_1220_li
@changelog_1238_li
#Improved PostgreSQL compatibility for ALTER TABLE ALTER COLUMN.
@changelog_1221_li
@changelog_1239_li
#Commas at the end of INSERT ... VALUES (), (), are now supported.
@changelog_1222_li
@changelog_1240_li
#The H2 Console "Start Browser" button now works even when the IP address changes while the tool runs (for example, because a wireless connection breaks, or when enabling / disabling the network connection).
@changelog_1223_li
@changelog_1241_li
#When casting from float or double to BigDecimal, the result was sometimes unexpected, because "new BigDecimal(double val)" was used. Now "BigDecimal.valueOf(double val)" and "new BigDecimal(Float.toString(f))" are used. But it is still not recommended to use float or double for currency values (see data type documentation).
@changelog_1224_li
@changelog_1242_li
#Global temporary tables are now deleted when closing the database. Before, they were deleted when opening the database the next time.
@changelog_1225_li
@changelog_1243_li
#UNIQUE was not listed as a keyword.
@changelog_1226_li
@changelog_1244_li
#Improved error message when an non-SQL-exception occurred in a user defined function. The method name and parameters are included in the error message.
@changelog_1227_li
@changelog_1245_li
#For some queries, the exception did not include the SQL statement. Example: select x from system_range(1, 2) group by 'a'.
@changelog_1228_li
@changelog_1246_li
#The Shell tool will execute SQL statements passed as using the command line parameter -sql.
@changelog_1229_li
@changelog_1247_li
#If InetAddress.getLocalHost() fails, the database should now throw an exception.
@changelog_1230_li
@changelog_1248_li
#New columns INFORMATION_SCHEMA.INDEXES.INDEX_CLASS and INFORMATION_SCHEMA.TABLES.TABLE_CLASS.
@changelog_1231_li
@changelog_1249_li
#INFORMATION_SCHEMA.INDEXES.SQL now contains the CREATE INDEX statement instead of just the fully qualified index name.
@changelog_1232_h2
@changelog_1250_h2
#Version 1.2.134 (2010-04-23)
@changelog_1233_li
@changelog_1251_li
#New system property h2.analyzeAuto (default 0 meaning disabled) to automatically run ANALYZE after that many changes to a table. For details, see the Javadoc of this system property. The plan is to set this property to 2000 in version 1.3.x.
@changelog_1234_li
@changelog_1252_li
#JdbcXAConnection.start() does not support TMJOIN. Issue 189.
@changelog_1235_li
@changelog_1253_li
#MySQL compatibility: TIMESTAMPDIFF is now an alias for DATEDIFF.
@changelog_1236_li
@changelog_1254_li
#MERGE did not respect foreign key and check constraints.
@changelog_1237_li
@changelog_1255_li
#ALTER TABLE ALTER COLUMN: changing the data type of a column no longer makes it nullable.
@changelog_1238_li
@changelog_1256_li
#When using AUTO_SERVER=TRUE, the server is now started as a daemon thread. This was a problem when using Tomcat and a connection pool.
@changelog_1239_li
@changelog_1257_li
#Servers can now be started as a daemon thread using the command line options -tcpDaemon, -pgDaemon, and -webDaemon.
@changelog_1240_li
@changelog_1258_li
#H2 Console: the built-in commands are now documented.
@changelog_1241_li
@changelog_1259_li
#REPLACE: if any parameter is null, the result is null.
@changelog_1242_li
@changelog_1260_li
#Queries with DISTINCT and ORDER BY will now use the index on ORDER BY if possible. This is specially important for queries used inside IN(SELECT ...).
@changelog_1243_li
@changelog_1261_li
#The new statement EXPLAIN ANALYZE executes the statement, and displays the query plan with the actual row scan count for each table.
@changelog_1244_li
@changelog_1262_li
#H2 Console: the auto-complete feature didn't quote column names that need quoting. Issue 186.
@changelog_1245_li
@changelog_1263_li
#The experimental LOB storage mechanism now supports all features of the old one. To use it, set the system property "h2.lobInDatabase" to "true". If you have used this feature in version 1.2.133, you need to export and re-import the database using SCRIPT / RUNSCRIPT.
@changelog_1246_li
@changelog_1264_li
#The functions isBeforeFirst() and isAfterLast() were not compliant to the JDBC spec. If the ResultSet contains no rows, they must return false. Fixed.
@changelog_1247_li
@changelog_1265_li
#Filesystem parameters like "split:" didn't work in server mode with baseDir set.
@changelog_1248_li
@changelog_1266_li
#If baseDir is set, and a database name is given which points to a directory outside the baseDir (eg. "../dbname"), an exception is thrown.
@changelog_1249_h2
@changelog_1267_h2
#Version 1.2.133 (2010-04-10)
@changelog_1250_li
@changelog_1268_li
#A new experimental LOB storage mechanism is available. When enabled, CLOB and BLOB data is stored in hidden tables in the database. To use it, set the system property "h2.lobInDatabase" to "true". Compression is not yet implemented. Duplicate objects are only stored once. Usually writing is slower, but reading is faster (mainly because of caching).
@changelog_1251_li
@changelog_1269_li
#The Shell tool threw a NumberFormatException on a empty statement.
@changelog_1252_li
@changelog_1270_li
#The h2small-*.jar did not support "drop all objects delete files". Now it is supported (the DeleteDbFiles tool is now included).
@changelog_1253_li
@changelog_1271_li
#Operations that don't fit in memory are now faster. Temporary file handling was changed.
@changelog_1254_li
@changelog_1272_li
#The default maximum log stream size is now 2 MB. This is a good value according to some performance tests.
@changelog_1255_li
@changelog_1273_li
#New system property "h2.syncMethod" to configure what method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The default is "sync" which calls RandomAccessFile.getFD().sync().
@changelog_1256_li
@changelog_1274_li
#ROWNUM could not be used for pagination. The follow query returned no rows: select x from (select *, rownum as r from system_range(1, 3)) where r=2;
@changelog_1257_li
@changelog_1275_li
#Workaround for a java.sql.Date issue: years above 9999 are not formatted correctly. When calling ResultSet.getString() on a date value, an alternative formatting algorithm is used.
@changelog_1258_li
@changelog_1276_li
#Prepared statements with nested subqueries did not always return the correct result. Example: select ?, ?, (select count(*) from test t, (select id from test where 0=?) t2 where t2.id=t.id) from test
@changelog_1259_li
@changelog_1277_li
#When using MULTI_THREADED=TRUE, the exception following exception could be thrown: "object already exists: TABLES"
@changelog_1260_li
@changelog_1278_li
#Comparison of integer columns against float numbers was not always correct. Issue 182.
@changelog_1261_li
@changelog_1279_li
#H2 Console: Editing the result of a multi-line queries failed. Issue 183.
@changelog_1262_li
@changelog_1280_li
#H2 Console: if the settings file (.h2.properties) can't be accessed, the exception is now ignored.
@changelog_1263_h2
@changelog_1281_h2
#Version 1.2.132 (2010-03-21)
@changelog_1264_li
@changelog_1282_li
#The implementation of a Java to C (source code level) converter has been started. The plan is: it should be possible to convert H2 (or a part of it) to C so that the database can be run without a JVM. This will be a long term project (it may take a year or so).
@changelog_1265_li
@changelog_1283_li
#User defined table implementation can now be used using CREATE TABLE ... ENGINE. Thanks to Sergi Vladykin for implementing this feature!
@changelog_1266_li
@changelog_1284_li
#Improved MS SQL Server compatibility: support string concatenation using "+". Thanks to Stepan for the patch!
@changelog_1267_li
@changelog_1285_li
#When using the multi-threaded mode, running ANALYZE concurrently in multiple connections could throw an exception.
@changelog_1268_li
@changelog_1286_li
#The MERGE statement is now about 30% faster when using a PreparedStatement.
@changelog_1269_li
@changelog_1287_li
#Multi-column indexes where the second or later column was descending did not always produce correct results (rows were missing in the result set, or the result set was empty).
@changelog_1270_li
@changelog_1288_li
#When using large transactions or a small log size, the database could get very slow (profiling shows the hotspot is in FileObjectDisk.sync()).
@changelog_1271_li
@changelog_1289_li
#The Shell tool now prints the stack trace when the list mode is enabled.
@changelog_1272_li
@changelog_1290_li
#CREATE ALIAS ... AS: Compilation was incorrect if the source code contained characters that are not supported by the default file encoding.
@changelog_1273_li
@changelog_1291_li
#Issue 176: the JdbcDataSource now also supports a 'description' property.
@changelog_1274_li
@changelog_1292_li
#The Shell tool threw a ArrayIndexOutOfBoundsException after 20 statements.
@changelog_1275_li
@changelog_1293_li
#When using the small version of H2 ('jarClient'), the first call to Connection.createBlob (or similar) could throw a ClassNotFoundException because the file org.h2.store.fs.FileSystemZip is not included. This missing class is now ignored.
@changelog_1276_li
@changelog_1294_li
#Literals of type BIGINT now have the correct data type.
@changelog_1277_h2
@changelog_1295_h2
#Version 1.2.131 (2010-03-05)
@changelog_1278_li
@changelog_1296_li
#Older versions of H2 (version 1.2.127 and older) could not connect to a new version (version 1.2.129 and newer). The connection blocked when trying to connect. Now the connection no longer blocks, instead a SQL exception is thrown.
@changelog_1279_li
@changelog_1297_li
#In versions 1.2.129 and 1.2.130, a database could not be opened sometimes after dropping tables or indexes, and then creating new indexes for existing tables. The exception contained the text "parent not found" (version 1.2.129) or "Table not found" (version 1.2.130).
@changelog_1280_li
@changelog_1298_li
#After the database was closed, a null pointer exception could occur in Database.flush.
@changelog_1281_li
@changelog_1299_li
#An ArrayIndexOutOfBoundsException could occur in the page store (eg. on "delete from table"). Fixed.
@changelog_1282_h2
@changelog_1300_h2
#Version 1.2.130 (2010-02-26)
@changelog_1283_li
@changelog_1301_li
#EXPLAIN: The query plan now contains ".tableScan" if a table scan is used.
@changelog_1284_li
@changelog_1302_li
#IN(..): when combining and IN(..) condition with a condition that didn't use an index, the result could contain duplicate rows.
@changelog_1285_li
@changelog_1303_li
#IN(..): the index was not used if there were multiple IN(..) conditions.
@changelog_1286_li
@changelog_1304_li
#For foreign key constraints, the metadata column INFORMATION_SCHEMA.INDEXES.CONSTRAINT_NAME was not set for non-unique indexes.
@changelog_1287_li
@changelog_1305_li
#PostgreSQL compatibility: when using the following exception was thrown: Column "T.TYPTYPMOD" not found. Fixed. This is only when using psqlodbc_08_04*.
@changelog_1288_li
@changelog_1306_li
#A tool to migrate an old database from the non-page store format to the newest version has been added in src/tools/org/h2/dev/util/Migrate.java. This file is not included in the jar file currently.
@changelog_1289_li
@changelog_1307_li
#When using temporary tables, the database didn't shrink sometimes when closing. Also, sometimes a database could not recover normally.
@changelog_1290_li
@changelog_1308_li
#Large transactions could run out of heap space. The maximum size of a transaction is now much larger.
@changelog_1291_li
@changelog_1309_li
#The default setting for the system property h2.webMaxValueLength is now 100000 (it was 10000 before).
@changelog_1292_li
@changelog_1310_li
#Creating a database was delayed about 2 seconds if the directory didn't exist.
@changelog_1293_li
@changelog_1311_li
#Implemented INIT feature. If the database URL contains ";INIT=...;" then the DDL or DML commands following are executed on startup. Example URL: jdbc:h2:mem:test;INIT=RUNSCRIPT FROM '~/create.sql' (patch from Kerry Sainsbury).
@changelog_1294_h2
@changelog_1312_h2
#Version 1.2.129 (2010-02-19)
@changelog_1295_li
@changelog_1313_li
#The methods of the CloseListener are added to the Trigger interface. The interface CloseListener is removed. This is potentially a breaking change for existing triggers.
@changelog_1296_li
@changelog_1314_li
#CREATE ALIAS: error message when compiling Java code have been improved.
@changelog_1297_li
@changelog_1315_li
#MVCC: creating a table with an incorrect constraint could cause strange errors.
@changelog_1298_li
@changelog_1316_li
#Hash indexes now are only used for single column indexes.
@changelog_1299_li
@changelog_1317_li
#The cache types WEAK_* and TQ are no longer supported. A weak reference cache never frees up memory so it's the same as having a very large cache size. The TQ cache was not included in the jar file since a longer time, and was not tested.
@changelog_1300_li
@changelog_1318_li
#The file system abstraction no longer throws SQL exceptions.
@changelog_1301_li
@changelog_1319_li
#DatabaseEventListener.diskSpaceIsLow has changed.
@changelog_1302_li
@changelog_1320_li
#The CompressTool no longer throw as SQL exceptions. Instead, it throws runtime exceptions.
@changelog_1303_li
@changelog_1321_li
#SimpleResultSet.addColumn and addRow now can throw a IllegalStateException instead of a SQLException.
@changelog_1304_li
@changelog_1322_li
#When doing an index lookup, decimal values with the same value but different scale (for example 0.00 and 0.0) where not considered equal in version 1.2.128. Now they are (unlike BigDecimal.equals()).
@changelog_1305_li
@changelog_1323_li
#The BNF parser now uses the visitor pattern.
@changelog_1306_li
@changelog_1324_li
#Converting a UUID to bytes was incorrect. Because of that, updatable result sets on tables with UUID primary key did not work.
@changelog_1307_li
@changelog_1325_li
#The database URL property DATABASE_EVENT_LISTENER_OBJECT is no longer supported (there are problems passing objects when the PostgreSQL driver is installed as well).
@changelog_1308_li
@changelog_1326_li
#H2 Console: asynchronous login (using a DatabaseEventListener) is no longer supported.
@changelog_1309_li
@changelog_1327_li
#A workaround for a Windows socket problem has been implemented. Thanks a lot to Sergi Vladykin.
@changelog_1310_li
@changelog_1328_li
#The Recover tool did not convert correctly convert CLOB data with non-ASCII characters.
@changelog_1311_li
@changelog_1329_li
#Tools: the method run(String... args) has been renamed to runTool(String... args).
@changelog_1312_li
@changelog_1330_li
#Server.startWebServer(Connection) was not working as expected.
@changelog_1313_li
@changelog_1331_li
#The database URL option ACCESS_MODE_LOG is no longer supported.
@changelog_1314_li
@changelog_1332_li
#The database URL option RECOVER has currently no effect.
@changelog_1315_li
@changelog_1333_li
#Converting an old (non-page store) database is no longer supported using this version.
@changelog_1316_li
@changelog_1334_li
#The following system properties are no longer supported: h2.overflowExceptions, h2.optimizeDropDependencies, h2.optimizeGroupSorted, h2.optimizeMinMax, h2.optimizeNot, h2.optimizeIn, h2.optimizeInJoin, h2.reuseSpace*. Most of then were there for a long time, but always with the same value. There was no unit test with the other value. So changing them was potentially dangerous (not a lot, but still).
@changelog_1317_li
@changelog_1335_li
#The setting LOG has currently no effect (it only had an effect when the page store was disabled).
@changelog_1318_li
@changelog_1336_li
#Disabling the page store is no longer supported. The old storage mechanism has been removed, shrinking the jar file size by almost 10%.
@changelog_1319_li
@changelog_1337_li
#The translated resources are now stored in UTF-8 format.
@changelog_1320_li
@changelog_1338_li
#The Windows service wrapper now detects if multiple versions of H2 are installed.
@changelog_1321_h2
@changelog_1339_h2
#Version 1.2.128 (2010-01-30)
@changelog_1322_li
@changelog_1340_li
#There are known errors on rollback when the page store is disabled and at the same time MVCC is used. See http://code.google.com/p/h2database/issues/detail?id=158
@changelog_1323_li
@changelog_1341_li
#The DeleteDbFiles tool deleted all files in the .lob.db directory, even files that didn't belong to the database.
@changelog_1324_li
@changelog_1342_li
#Automatic conversion of old databases to the page store format failed if the database contained LOB files.
@changelog_1325_li
@changelog_1343_li
#Nested subqueries didn't work for INSERT INTO and IN(..). Example: insert into test ((select 1));
@changelog_1326_li
@changelog_1344_li
#If the database was already closed using SHUTDOWN IMMEDIATELY, closing a second connection could throw a NullPointerException if there was a local temporary table.
@changelog_1327_li
@changelog_1345_li
#Less classes are loaded when using the database in embedded mode.
@changelog_1328_li
@changelog_1346_li
#The information schema tables are only initialized when needed. This reduces memory usage and speeds up creating in-memory databases. Each in-memory database needs about 8 KB of heap memory.
@changelog_1329_li
@changelog_1347_li
#Nested UNION/INTERSECT queries with brackets could produce the wrong result if used within a subquery. Example: select count(*) from (select 1 union (select 2 intersect select 2)) x;
@changelog_1330_li
@changelog_1348_li
#Comparing an column against a constant expression with a higher precision or length than the column could give wrong results (the expression was truncated before comparing).
@changelog_1331_li
@changelog_1349_li
#Improved PostgreSQL compatibility (support SHOW DEFAULT_TRANSACTION_ISOLATION).
@changelog_1332_li
@changelog_1350_li
#Documentation: the javadocs for Csv.write and read used the wrong default charset.
@changelog_1333_li
@changelog_1351_li
#MVCC: if the table was locked in exclusive mode (such as SELECT ... FOR UPDATE), another session could query the table. This is now longer possible.
@changelog_1334_li
@changelog_1352_li
#If a FOR UPDATE query was executed twice (using a PreparedStatement), the table was not locked.
@changelog_1335_li
@changelog_1353_li
#Triggers: INSTEAD OF triggers are now supported. Such triggers can be defined on views.
@changelog_1336_li
@changelog_1354_li
#New system property h2.identifiersToUpper. If set to false, identifiers in SQL statements are case sensitive even if they are not quoted.
@changelog_1337_li
@changelog_1355_li
#Slightly improved performance if the table is already locked.
@changelog_1338_li
@changelog_1356_li
#CompressLZF: faster decompression.
@changelog_1339_li
@changelog_1357_li
#PgServer: the wrong size was sent for VARCHAR data. Thanks again to Sergi Vladykin for the patch.
@changelog_1340_li
@changelog_1358_li
#Serialized access mode (server-less multi-connection mode): fixed getGeneratedKeys() for sequences.
@changelog_1341_h2
@changelog_1359_h2
#Version 1.2.127 (2010-01-15)
@changelog_1342_li
@changelog_1360_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_1343_li
@changelog_1361_li
#Page store: new databases can not be opened with older versions.
@changelog_1344_li
@changelog_1362_li
#Page store: adding data to new database is now faster.
@changelog_1345_li
@changelog_1363_li
#File system: getting the file name from a path is now faster. This should speed up BLOB and CLOB access.
@changelog_1346_li
@changelog_1364_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_1347_li
@changelog_1365_li
#SHOW COLUMNS did not work correctly if there where multiple indexes on the same columns.
@changelog_1348_li
@changelog_1366_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_1349_li
@changelog_1367_li
#Result sets larger than 2 GB threw an exception "Negative seek offset". Fixed.
@changelog_1350_li
@changelog_1368_li
#If the system property h2.check was set to false, an ArrayIndexOutOfBoundsException could occur.
@changelog_1351_li
@changelog_1369_li
#Alter table is now supported even if a table has views defined. (Patch from Kerry Sainsbury).
@changelog_1352_li
@changelog_1370_li
#Fulltext search: exceptions within the fulltext search package had the wrong SQL state.
@changelog_1353_li
@changelog_1371_li
#The Lucene fulltext search ignored transaction rollback. Fixed using a trigger on rollback.
@changelog_1354_li
@changelog_1372_li
#Trigger can now be called on rollback.
@changelog_1355_li
@changelog_1373_li
#The shell script h2.sh ignored command line line arguments.
@changelog_1356_li
@changelog_1374_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_1357_li
@changelog_1375_li
#The user home directory prefix (~) is now only expanded when followed by a slash or backslash, or standing alone.
@changelog_1358_li
@changelog_1376_li
#Native fulltext search: before inserting or deleting data, FT_INIT() had to be called. This is no longer required.
@changelog_1359_li
@changelog_1377_li
#The .trace.db file is now only created if required.
@changelog_1360_li
@changelog_1378_li
#Shell tool: improved PostgreSQL compatibility.
@changelog_1361_li
@changelog_1379_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_1362_li
@changelog_1380_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_1363_li
@changelog_1381_li
#Faster data conversion from BIGINT or INT to DECIMAL.
@changelog_1364_li
@changelog_1382_li
#Server-less multi-connection mode: try to delete log files if switching between read/write operations.
@changelog_1365_li
@changelog_1383_li
#CompressLZF: Faster decompress and improved javadocs
@changelog_1366_h2
@changelog_1384_h2
#Version 1.2.126 (2009-12-18)
@changelog_1367_li
@changelog_1385_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_1368_li
@changelog_1386_li
#CSVREAD: when reading the column names from the CSV file, column names that contain no special characters are considered case insensitive now.
@changelog_1369_li
@changelog_1387_li
#Optimization index conditions of the form 'column=NULL' (which is always false; unlike 'column IS NULL').
@changelog_1370_li
@changelog_1388_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_1371_li
@changelog_1389_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_1372_li
@changelog_1390_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_1373_li
@changelog_1391_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_1374_li
@changelog_1392_li
#JaQu: the decompiler has been improved, and a few test cases already work. It is still incomplete however.
@changelog_1375_li
@changelog_1393_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_1376_li
@changelog_1394_li
#The reserve heap memory is no longer used.
@changelog_1377_li
@changelog_1395_li
#Database.checkpoint() could throw a NullPointerException.
@changelog_1378_h2
@changelog_1396_h2
#Version 1.2.125 (2009-12-06)
@changelog_1379_li
@changelog_1397_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_1380_li
@changelog_1398_li
#The shell tool now has a very simple statement history.
@changelog_1381_li
@changelog_1399_li
#The zip file system implementation now supports the '~' home directory prefix. Example database URL: jdbc:h2:zip:~/test.zip!/test
@changelog_1382_li
@changelog_1400_li
#Right outer joins on tables that were already 'inner joined' was processed incorrectly.
@changelog_1383_li
@changelog_1401_li
#Temporary files from LOB objects were not deleted early enough when using the server mode.
@changelog_1384_li
@changelog_1402_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_1385_li
@changelog_1403_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_1386_li
@changelog_1404_li
#Trigger that are called before a select statement are now supported. This allows to create tables that work like materialized views.
@changelog_1387_li
@changelog_1405_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_1388_li
@changelog_1406_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_1389_li
@changelog_1407_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_1390_li
@changelog_1408_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_1391_li
@changelog_1409_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_1392_li
@changelog_1410_li
#The test cases don't access the file system directly, this simplifies GAE for Java testing. Thanks to Vince Bonfanti.
@changelog_1393_li
@changelog_1411_li
#More bugs in the server-less multi-connection mode have been fixed.
@changelog_1394_li
@changelog_1412_li
#When running against an old database, the SCRIPT statement could generate a SQL script that contained duplicate indexes (PRIMARY_KEY_E).
@changelog_1395_li
@changelog_1413_li
#JdbcConnectionPool.getConnection() could throw a NullPointerException.
@changelog_1396_li
@changelog_1414_li
#User defined functions: the source code is now available using SELECT SOURCE FROM INFORMATION_SCHEMA.FUNCTION_ALIASES.
@changelog_1397_li
@changelog_1415_li
#User defined functions with source code didn't work after re-opening the database.
@changelog_1398_li
@changelog_1416_li
#The newsfeeds are now Atom 1.0 standard compliant.
@changelog_1399_li
@changelog_1417_li
#The database is now closed after an out of memory exception, because the database could get corrupt otherwise.
@changelog_1400_li
@changelog_1418_li
#Better error message if both AUTO_SERVER and SERIALIZED parameters are set to TRUE.
@changelog_1401_li
@changelog_1419_li
#Drop table did not delete lob files in old file store (not PAGE_STORE).
@changelog_1402_h2
@changelog_1420_h2
#Version 1.2.124 (2009-11-20)
@changelog_1403_li
@changelog_1421_li
#Clustering: there is now a way to detect which cluster instances are running.
@changelog_1404_li
@changelog_1422_li
#ConvertTraceFile: the SQL statement statistics are better formatted (newline are removed).
@changelog_1405_li
@changelog_1423_li
#The file lock thread is now stopped when the database is closed.
@changelog_1406_li
@changelog_1424_li
#Issue 140: the Script tool now supports writing to a stream.
@changelog_1407_li
@changelog_1425_li
#Issue 138: the trace output of Statement.execute(String, int) and executeUpdate was incorrect.
@changelog_1408_li
@changelog_1426_li
#Page store: new databases can not be opened with older versions.
@changelog_1409_li
@changelog_1427_li
#Page store: multi-column indexes didn't work if the cache was very small.
@changelog_1410_li
@changelog_1428_li
#Page store: opening a database could theoretically result in an endless loop.
@changelog_1411_li
@changelog_1429_li
#Page store: adding large indexed columns could get very slow.
@changelog_1412_li
@changelog_1430_li
#Page store: after a duplicate key exception, an ArrayIndexOutOfBoundsException could be thrown (only for very large rows).
@changelog_1413_li
@changelog_1431_li
#Page store: the recover tool sometimes generated a script file that contained duplicate data.
@changelog_1414_li
@changelog_1432_li
#Page store: sometimes opening a read-only database failed.
@changelog_1415_li
@changelog_1433_li
#Page store: opening a database sometimes failed if large rows where updated, or if a table was truncated before.
@changelog_1416_li
@changelog_1434_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_1417_li
@changelog_1435_li
#Page store: getting the min value from a descending index with NULL entries could return the wrong result.
@changelog_1418_li
@changelog_1436_li
#Page store: improved auto-recovery after power failure.
@changelog_1419_li
@changelog_1437_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_1420_li
@changelog_1438_li
#User defined functions can be created with source code. Example: CREATE ALIAS HI AS 'String hi() { return "Hello"; }'
@changelog_1421_li
@changelog_1439_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_1422_li
@changelog_1440_li
#Inserting LOBs got slower each time the process was restarted. It could loop endlessly after about 1000 process restarts.
@changelog_1423_li
@changelog_1441_li
#Issue 117: Multi-version concurrency: concurrent MERGE statements now work.
@changelog_1424_li
@changelog_1442_li
#Improved read-only database detection.
@changelog_1425_h2
@changelog_1443_h2
#Version 1.2.123 (2009-11-08)
@changelog_1426_li
@changelog_1444_li
#Page store: new databases can not be opened with older versions.
@changelog_1427_li
@changelog_1445_li
#Page store: updating large rows (rows with more than 2000 bytes of data) could corrupt the database.
@changelog_1428_li
@changelog_1446_li
#Page store: inserting very large rows failed with ArrayIndexOutOfBoundsException.
@changelog_1429_li
@changelog_1447_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_1430_li
@changelog_1448_li
#The fulltext search methods and fields are now protected instead of private, to make the classes more easily extensible.
@changelog_1431_li
@changelog_1449_li
#The Lucene fulltext search now also returns the score.
@changelog_1432_li
@changelog_1450_li
# New function SCOPE_IDENTITY() to avoid problems when inserting rows in a trigger.
@changelog_1433_li
@changelog_1451_li
#Statement.getGeneratedKeys() returned the wrong value if a trigger changed the identity value after inserting the row.
@changelog_1434_li
@changelog_1452_li
#Improved error messages: identifiers and values are now quoted.
@changelog_1435_li
@changelog_1453_li
#Improved error message when casting a value failed: the column name and type is included in the message.
@changelog_1436_li
@changelog_1454_li
#Improved support for GAE for Java thanks to Vince Bonfanti.
#To start the <a href="quickstart.html#h2_console">H2 Console tool</a>, double click the jar file, or run <code>java -jar h2*.jar</code>, <code>h2.bat</code>, or <code>h2.sh</code>.
...
...
@@ -2981,7 +3035,7 @@ jdbc:h2:mem:
ダウンロード
@download_1001_h3
#Version 1.2.145 (2010-11-02)
#Version 1.3.145 (2010-11-02)
@download_1002_a
Windows Installer
...
...
@@ -6890,7 +6944,7 @@ H2 データベース エンジン
ダウンロード
@mainWeb_1007_td
# Version 1.2.145 (2010-11-02):
# Version 1.3.145 (2010-11-02) Beta:
@mainWeb_1008_a
#Windows Installer (4 MB)
...
...
@@ -9809,7 +9863,7 @@ H2 コンソール アプリケーション
#H2 Console: support CLOB/BLOB upload.
@roadmap_1400_li
#Move away from system properties where possible.
#Database file name suffix: a way to use no or a different suffix (for example using a slash).
@roadmap_1401_li
#Database file lock: detect hibernate / standby / very slow threads (compare system time).
...
...
@@ -9908,165 +9962,162 @@ H2 コンソール アプリケーション
#Maybe use PhantomReference instead of finalize.
@roadmap_1433_li
#Database file name suffix: a way to use no or a different suffix (for example using a slash).
@roadmap_1434_li
#Database file name suffix: should only have one dot by default. Example: .h2db
@roadmap_1435_li
@roadmap_1434_li
#Issue 196: Function based indexes
@roadmap_1436_li
@roadmap_1435_li
#Fix the disk space leak (killing the process at the exact right moment will increase the disk space usage; this space is not re-used). See TestDiskSpaceLeak.java
@roadmap_1437_li
@roadmap_1436_li
#ROWNUM: Oracle compatibility when used within a subquery. Issue 198.
@roadmap_1438_li
@roadmap_1437_li
#Allow to access the database over HTTP (possibly using port 80) and a servlet in a REST way.
@roadmap_1439_li
@roadmap_1438_li
#ODBC: encrypted databases are not supported because the ;CIPHER= can not be set.
@roadmap_1440_li
@roadmap_1439_li
#Support CLOB and BLOB update, specially conn.createBlob().setBinaryStream(1);
@roadmap_1441_li
@roadmap_1440_li
#Optimizer: index usage when both ascending and descending indexes are available. Issue 178.
@roadmap_1442_li
@roadmap_1441_li
#Triggers: support user defined execution order. Oracle: CREATE OR REPLACE TRIGGER TEST_2 BEFORE INSERT ON TEST FOR EACH ROW FOLLOWS TEST_1. SQL specifies that multiple triggers should be fired in time-of-creation order. PostgreSQL uses name order, which was judged to be more convenient. Derby: triggers are fired in the order in which they were created.
@roadmap_1443_li
@roadmap_1442_li
#PostgreSQL compatibility: combine "users" and "roles". See: http://www.postgresql.org/docs/8.1/interactive/user-manag.html
@roadmap_1444_li
@roadmap_1443_li
#Improve documentation of system properties: only list the property names, default values, and description.
@roadmap_1445_li
@roadmap_1444_li
#Support running totals / cumulative sum using SUM(..) OVER(..).
@roadmap_1446_li
@roadmap_1445_li
#Improve object memory size calculation. Use constants for known VMs, or use reflection to call java.lang.instrument.Instrumentation.getObjectSize(Object objectToSize)
@roadmap_1447_li
@roadmap_1446_li
#Triggers: NOT NULL checks should be done after running triggers (Oracle behavior, maybe others).
@roadmap_1448_li
@roadmap_1447_li
#Common Table Expression (CTE) / recursive queries: support INSERT INTO ... SELECT ... Issue 219.
#Common Table Expression (CTE) / recursive queries: support multiple named queries. Issue 220.
@roadmap_1452_li
@roadmap_1451_li
#Common Table Expression (CTE) / recursive queries: identifier scope may be incorrect. Issue 222.
@roadmap_1453_li
@roadmap_1452_li
#Common Table Expression (CTE) / recursive queries: support parameters.
@roadmap_1454_li
@roadmap_1453_li
#Log long running transactions (similar to long running statements).
@roadmap_1455_li
@roadmap_1454_li
#Support schema specific domains.
@roadmap_1456_li
@roadmap_1455_li
#Parameter data type is data type of other operand. Issue 205.
@roadmap_1457_li
@roadmap_1456_li
#Some combinations of nested join with right outer join are not supported.
@roadmap_1458_li
@roadmap_1457_li
#DatabaseEventListener.openConnection(id) and closeConnection(id).
@roadmap_1459_li
@roadmap_1458_li
#Compatibility for data type CHAR (Derby, HSQLDB). Issue 212.
@roadmap_1460_li
@roadmap_1459_li
#Compatibility with MySQL TIMESTAMPDIFF. Issue 209.
@roadmap_1461_li
@roadmap_1460_li
#Optimizer: use a histogram of the data, specially for non-normal distributions.
@roadmap_1462_li
@roadmap_1461_li
#Trigger: allow declaring as source code (like functions).
@roadmap_1463_li
@roadmap_1462_li
#User defined aggregate: allow declaring as source code (like functions).
@roadmap_1464_li
@roadmap_1463_li
#The error "table not found" is sometimes caused by using the wrong database. Add "(this database is empty)" to the exception message if applicable.
@roadmap_1465_li
@roadmap_1464_li
#PostgreSQL compatibility: support escape with double \\.
@roadmap_1466_li
@roadmap_1465_li
#Document the TCP server "management_db". Maybe include the IP address of the client.
@roadmap_1467_li
@roadmap_1466_li
#Use javax.tools.JavaCompilerTool instead of com.sun.tools.javac.Main
@roadmap_1468_li
@roadmap_1467_li
#If a database object was not found in the current schema, but one with the same name existed in another schema, included that in the error message.
@roadmap_1469_li
@roadmap_1468_li
#Optimization to use an index for OR when using multiple keys: where (key1 = ? and key2 = ?) OR (key1 = ? and key2 = ?)
@roadmap_1470_li
@roadmap_1469_li
#JaQu should support a DataSource and a way to create a Db object using a Connection (for multi-threaded usage with a connection pool).
@roadmap_1471_li
@roadmap_1470_li
#Move table to a different schema (rename table to a different schema), possibly using ALTER TABLE ... SET SCHEMA ...;
@roadmap_1472_li
@roadmap_1471_li
#nioMapped file system: automatically fall back to regular (non mapped) IO if there is a problem (out of memory exception for example).
@roadmap_1473_li
@roadmap_1472_li
#Column as parameter of function table. Issue 228.
@roadmap_1474_li
@roadmap_1473_li
#Connection pool: detect ;AUTOCOMMIT=FALSE in the database URL, and if set, disable autocommit for all connections.
@roadmap_1475_li
@roadmap_1474_li
#Compatibility with MS Access: support "&" to concatenate text.
@roadmap_1476_li
@roadmap_1475_li
#The BACKUP statement should not synchronize on the database, and therefore should not block other users.
@roadmap_1477_li
@roadmap_1476_li
#Listener or authentication module for new connections, or a way to restrict the number of different connections to a tcp server, or to prevent to login with the same username and password from different IPs. Possibly using the DatabaseEventListener API, or a new API.
@roadmap_1478_li
@roadmap_1477_li
#Support ALTER TABLE ADD COLUMN IF NOT EXISTS.
@roadmap_1479_li
@roadmap_1478_li
#Document the database file format.
@roadmap_1480_li
@roadmap_1479_li
#Support reading LOBs.
@roadmap_1481_li
@roadmap_1480_li
#Require appending DANGEROUS=TRUE when using certain dangerous settings such as LOG=0, LOG=1, LOCK_MODE=0, disabling FILE_LOCK,...
@roadmap_1482_li
@roadmap_1481_li
#Allow to defragment at runtime (similar to SHUTDOWN DEFRAG) in a background thread.
@roadmap_1483_h2
@roadmap_1482_h2
#Not Planned
@roadmap_1484_li
@roadmap_1483_li
#HSQLDB (did) support this: select id i from test where i<0 (other databases don't). Supporting it may break compatibility.
@roadmap_1485_li
@roadmap_1484_li
#String.intern (so that Strings can be compared with ==) will not be used because some VMs have problems when used extensively.
@roadmap_1486_li
@roadmap_1485_li
#In prepared statements, identifier names (table names and so on) can not be parameterized. Adding such a feature would complicate the source code without providing reasonable speedup, and would slow down regular prepared statements.
