本号为 5.5.11-20.2 的 Percona Server 5.5 第一个稳定版终于发布了，该版本同时包含 MacOS 下的一个体验构建版。
Percona Server 5.5 的新特性：
- HandlerSocket, NoSQL 插件
- InnoDB 快速创建索引 已支持 mysqldump, ALTER TABLE 和 OPTIMIZE TABLE.
修复的bug：
- Bug #757749 – Using ALTER TABLE to convert an InnoDB table to a MEMORY table could fail due to a bug in innodb_expand_fast_index_creation.patch. (Alexey Kopytov)
- Bug #764395 – InnoDB crashed with an assertion failure when receiving a signal on pwrite(). The problem was that InnoDB I/O code was not fully conforming to the standard on POSIX systems. Calls to fsync(), pread(), and pwrite() can be interrupted by a signal. In such cases, InnoDB would crash with an assertion failure, rather than just restarting the interrupted call. (Alexey Kopytov)
- Bug #766236 – A crash was occurring in some cases when innodb_lazy_drop_table was enabled with very large buffer pools. (Yasufumi Kinoshita)
- Bug #733317 – SYS_STATS internal table of XtraDB has been expanded for supporting ‘innodb_stats_method’ from InnoDB-plugin. (Yasufumi Kinoshita)
相关链接地址：
- 下载: Binary distributions, Percona Software Repositories and Experimental build for MacOS
- Installation instructions
- Consulting, support, training, and custom development
- Release notes
- Documentation
- Developer discussion group
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