On out of disk space, the database could get corrupt sometimes, if later write operations succeeded. Now the file is closed on the first unsuccessful write operation, so that later requests fail consistently. DatabaseEventListener.diskSpaceIsLow() is no longer supported because it can't be guaranteed that it always works correctly.

In the server mode, BLOB and CLOB objects are no longer closed when the result set is closed (as required by the JDBC spec).

The following system properties are no longer supported:, h2.allowBigDecimalExtensions, h2.emptyPassword, h2.minColumnNameMap, h2.returnLobObjects, h2.webMaxValueLength.

It is now possible to control the port that the server uses by passing in an AUTO_SERVER_PORT parameter.

New experimental system property "h2.modifyOnWrite": when enabled, the database file is only modified when writing to the database. This should speed up the serialized file lock.

Issue 180: when deserializing objects, the context class loader is used instead of the default class loader if the system property "h2.useThreadContextClassLoader" is set. Thanks a lot to Noah Fontes for the patch!

Issue 326: improved support for case sensitive (mixed case) identifiers without quotes when using DATABASE_TO_UPPER=FALSE.

Issue 351: MySQL mode: can not create a table with the column "KEY", and can not open databases where such a table already exists. (KEY is _not_ a keyword.)

Issue 351: MySQL mode: can not create a table with the column "KEY", and can not open databases where such a table already exists. (KEY is now a keyword.)

Issue 354: when using the multi-threaded kernel option, and multiple threads concurrently prepared SQL statements that use the same view or the same index of a view, then in some cases an infinite loop could occur.

Updateable result sets: if the value is not set when inserting a new row, the default value is now used (the same behavior as MySQL, PostgreSQL, and Apache Derby) instead of NULL.