Percona Server 5.5.42-37.1 发布，此版本是基于 MySQL 5.5.42 版本，包括其所有 bug 修复，是 5.5. 系列最新的稳定版本。
RPMpre-install script assumed that the
PIDfile was always located in the
datadir. If it was not, during installation, wrong assumption could be made if the server was running or not. Bug fixed #1201896.
SHOW GRANTSdisplayed only the privileges granted explicitly to the named account. Other effectively available privileges were not displayed. Fixed by implementing Extended SHOW GRANTS feature. Bug fixed #1354988 (upstream #53645).
- InnoDB lock monitor output was printed even if it was not requested. Bug fixed #1418996.
- The stored procedure key was made consistent with other keys in the Slow Query Log by replacing space with an underscore. Bug fixed #1419230.
同时发布的还有 Percona Server 5.6.23-72.1
Percona 为 mysql”>MySQL 数据库服务器进行了改进，在功能和性能上较 MySQL 有着很显著的提升。该版本提升了在高负载情况下的 InnoDB 的性能、为 DBA 提供一些非常有用的性能诊断工具；另外有更多的参数和命令来控制服务器行为。
Percona Server 只包含 MySQL 的服务器版，并没有提供相应对 MySQL 的 Connector 和 GUI 工具进行改进。