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Percona Server 5.1.55-12.6 is now the current stable release version. It is is based on MySQL 5.1.55.
- Fixed compiler warnings in both the core server and in XtraDB. (Alexey Kopytov, Yasufumi Kinoshita)
- Bug #602047 - The ROWS_READ columns of TABLE_STATISTICS and INDEX_STATISTICS were not properly updated when a query involved index lookups on an InnoDB table. (Yasufumi Kinoshita)
- Bug #707742 - The server could crash when trying to import a table which had not been previously prepared using xtrabackup –prepare –export. Also, on servers with huge buffer pools, adding or removing an index even on an empty InnoDB table could take a long time due to excessive locking when innodb_dict_size_limit was non-zero. Locking was relaxed to alleviate this. (Yasufumi Kinoshita)
- Bug #724674 - Ported an updated version of the original implementation of the Remove Excessive Function Calls (fcntl) feature, which removes some fcntl calls to improve performance. (Oleg Tsarev)