Percona Server 5.5.44

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　　Percona Server 5.5.44-37.3 发布，此版本基于 MySQL 5.5.44，包括其所有 bug 修复，是当前 5.5 系列最新的稳定版本。此版本现已提供下载，也提供在 Percona Software Repositories。
　　Bugs 修复
　　

• 　　Symlinks to libmysqlclient libraries were missing on CentOS 6. Bug fixed #1408500.
  
• 
  　　RHEL/CentOS 6.6 OpenSSL package (1.0.1e-30.el6_6.9), containing a fix for CVE-2015-4000, changed the DH key>MySQL as it uses 512 bit keys. Fixed by backporting an upstream 5.7 fix that increases the key>
  
• 　　innochecksum would fail to check tablespaces in compressed format. The fix for this bug has been ported from Facebook MySQL 5.1 patch. Bug fixed #1100652 (upstream #66779).
  
• 　　Issuing SHOW BINLOG EVENTS with an invalid starting binlog position would cause a potentially misleading message in the server error log. Bug fixed #1409652 (upstream #75480).
  
• 　　While using max_slowlog_size,the slow query log was rotated every time slow query log was enabled, not really checking if the current slow log is indeed bigger than max_slowlog_size or not. Bug fixed #1416582.
  
• 　　If query_response_time_range_basevariable was set as a command line option or in a configuration file, its value would not take effect until the first flush was made. Bug fixed #1453277 (Preston Bennes).
  
• 　　Prepared XA transactions with update undo logs were not properly recovered. Bug fixed #1468301.
  
• 　　Variable log_slow_sp_statements now supports skipping the logging of stored procedures into the slow log entirely with new OFF_NO_CALLS option. Bug fixed #1432846.
  

　　其他 bug 修复： #1380895 (upstream #72322)。更多改进内容请看发行说明。
　　Percona Server 5.6.25-73.0 发布，此版本现已提供在 Percona web site 和 Software Repositories。
　　此版本基于 MySQL 5.6.25，包括其所有 bug 修复，是当前 5.6 系列最新的 GA 版本。
　　新特性

• 　　Percona Server 实现了对 PROXY 协议的支持。
  

　　Bugs 修复
　　

• 　　Symlinks to libmysqlclient libraries were missing on CentOS 6. Bug fixed #1408500.
  
• 
  　　RHEL/CentOS 6.6 OpenSSL package (1.0.1e-30.el6_6.9), containing a fix for CVE-2015-4000, changed the DH key>MySQL as it uses 512 bit keys. Fixed by backporting an upstream 5.7 fix that increases the key>
  
• 　　Some compressed InnoDB data pages could be mistakenly considered corrupted, crashing the server. Bug fixed #1467760 (upstream #73689) Justin Tolmer.
  
• 　　innochecksum would fail to check tablespaces in compressed format. The fix for this bug has been ported from Facebook MySQL 5.6 patch. Bug fixed #1100652 (upstream #66779).
  
• 　　Using concurrent REPLACE, LOAD DATA REPLACE or INSERT ON DUPLICATE KEY UPDATE statements in the READ COMMITTED isolation level or with the innodb_locks_unsafe_for_binlog option enabled could lead to a unique-key constraint violation. Bug fixed #1308016 (upstream #76927).
  
• 　　Issuing SHOW BINLOG EVENTS with an invalid starting binlog position would cause a potentially misleading message in the server error log. Bug fixed #1409652 (upstream #75480).
  
• 　　While using max_slowlog_size,the slow query log was rotated every time slow query log was enabled, not really checking if the current slow log is indeed bigger than max_slowlog_size or not. Bug fixed #1416582.
  
• 　　Fixed possible server assertions when Backup Locks are used. Bug fixed #1432494.
  
• 　　If query_response_time_range_basevariable was set as a command line option or in a configuration file, its value would not take effect until the first flush was made. Bug fixed #1453277 (Preston Bennes).
  
• 　　mysqld_safe script is now searching for libjemalloc.so.1 library, needed by TokuDB, in the basedir directory as well. Bug fixed #1462338.
  
• 　　Prepared XA transactions could cause a debug assertion failure during the shutdown. Bug fixed #1468326.
  
• 　　Variable log_slow_sp_statements now supports skipping the logging of stored procedures into the slow log entirely with new OFF_NO_CALLS option. Bug fixed #1432846.
  
• 　　TokuDB HotBackup library is now automatically loaded with mysqld_safe script. Bug fixed #1467443.
  

　　其他 bug 修复 #1457113, #1380895, and #1413836。更多改进内容请看发行说明。
　　Percona 为 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。
　　Percona Server 使用了一些 google-mysql-tools, Proven Scaling, Open Query 对 MySQL 进行改造。