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。
Percona Server 发布了 5.5.8-20.0 版本，这是对 MySQL 5.5.8 正式版的第一个增强版本，主要亮点有：
* 通过对服务器和存储引擎的改善提升了性能和可伸缩性
* 优化闪存存储，例如 SSD, Virident, and FusionIO
* 为元计算作出的优化
* 提供 HandlerSocket 插件用于 NoSQL 访问
* There’s an Amazon OS repository, as well as Yum and Apt repositories
* 改善了复制、分区和存储过程等功能
* 更详细的诊断和可调整性
* 更强的可嵌入式开发，包括可嵌入式的认证
在 MySQL 5.5 的基础上，详细的改进内容包括：
新功能
* InnoDB adaptive hash function searches can now be spread across multiple partitions (see Multiple Adaptive Hash Search Partitions. Bug fixed: #688866. (Yasufumi Kinoshita)
* Information from SHOW INNODB STATUS was made available in new status variables in InnoDB Show Status. Bug fixed:#698797.
变量更改
* New variable innodb_adaptive_flushing_method was added.
* New variable innodb_use_global_flush_log_at_trx_commit was added. Bug fixed: #635399. (Yasufumi Kinoshita)
* New variable log_warnings_silence replaced old variable suppress_log_warning_1592. Bug fixed: #692413. (Oleg Tsarev)
* Old variable innodb_adaptive_checkpoint was deleted. Bug fixed: #689450. (Yasufumi Kinoshita)
* Old variable innodb_flush_log_at_trx_commit_session was deleted. Bug fixed: #635399. (Yasufumi Kinoshita)
* Old variable use_global_long_query_time was deleted. (Oleg Tsarev) Bug fixed: #692415.
* Old variable variable innodb_ibuf_accel_rate was renamed to innodb_ibuf_merge_rate. Bug fixed: #695906 (Yasufumi Kinoshita)
* Old variable variable innodb_ibuf_active_contract was renamed to innodb_ibuf_active_merge. Bug fixed: #695906 (Yasufumi Kinoshita)
* Old variable enable_query_response_time_stats was renamed to query_response_time_stats. (Oleg Tsarev)
* Existing variable log_slow_verbosity had two new values added:profiling and profiling_use_getrusage. (Oleg Tsarev)
* Existing variables profiling_server and profiling_use_getrusage were merged into the Slow Query Log page. (Oleg Tsarev)
其他更改
* Additional information was added to the LOG section of the SHOW STATUS command. Bug fixed: #693269. (Yasufumi Kinoshita)
* The SHOW PATCHES command was removed. (Vadim Tkachenko)
* The INFORMATION_SCHEMA table XTRADB_ENHANCEMENTS was removed. (Yasufumi Kinoshita)
* Several fields in the INFORMATION_SCHEMA table INNODB_INDEX_STATS were renamed. Bug fixed: #691777. (Yasufumi Kinoshita)
* The XtraDB version was set to 20.0. (Aleksandr Kuzminsky)
* Many InnoDB compilation warnings were fixed. Bug fixed:#695273. (Yasufumi Kinoshita)
* An Amazon OS repository was created. Bug fixed: #691996. (Aleksandr Kuzminsky)