(a) any accidental further access to it
(b) throwing an exception if the client code calls close() more than once

Fix for a bug where we would sometimes use the wrong unique constraint to validate foreign key constraints.

Stand-alone command line version of the profiling tool (will be merged with the profiling tool later on).

PostgreSQL compatibility: support for EXTRACT(WEEK FROM dateColumn). Thanks to Prashant Bhat for the patch!

PostgreSQL compatibility: support for EXTRACT(WEEK FROM dateColumn). Thanks to Prashant Bhat for the patch!

The ResultSetMetaData methods getSchemaName and getTableName could return null instead of "" (an empty string) as specified in the JDBC API.

The CreateCluster tool could not be used if the source database contained a CLOB or BLOB. The root cause was that the TCP server did not synchronize on the session, which caused a problem when using the exclusive mode.