The data corruption issue in PostgreSQL 9.3 affects binary replication standbys, servers being recovered from point-in-time-recovery backup, and standalone servers which recover from a system crash. The bug causes unrecoverable index corruption during recovery due to incorrect replay of row locking operations. This can then cause query results to be inconsistent depending on whether or not an index is used, and eventually lead to primary key violations and similar issues. For this reason, users are encouraged to replace each of their standby databases with a new base backup after applying the update.
Other PostgreSQL 9.3-only fixes in this update include:
Make sure that statistics files for dropped databases get deleted
Allow materialized views to be referenced in UPDATE and DELETE queries
Add read-only data_checksum parameter
Prevent erroneous operator push-down in postgres_fdw
This release resolves some other issues in all versions of PostgreSQL, including:
Fix timing consistency issue with NOTIFY
Allow regular expression execution to be cancelled
Improve performance of index checks for newly added rows
Prevent premature walsender disconnection
Prevent memory errors on newer Windows versions
Update timezone files
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