MariaDB 项目刚刚发布了 5.3.1 Beta 版，这是一个bug修复版本。MariaDB 5.3 系列引入了很多新特性，该版本同样还是基于 MySQL 5.1 构建的，主要特性包括：
- 子查询优化：subquery optimizations that finally make subqueries usable
- 修改很多查询优化处理：many optimizer changes, including Classic Hash Join, Batched Key Access, a new implementation of Multi-Range-Read optimizations as well as Index Condition Pushdown
- 支持 HanderSocket 提供 NoSQL 访问：NoSQL-style interfaces via the HandlerSocket plugin as well as dynamic columns
- 启用 XtraDB 的分组提交：group commit in XtraDB when the binary log is enabled
- 提升 Windows 平台下的性能
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