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因为 MySQL 优化器在选择如何优化查询时，会根据统一信息 → 因为 MySQL 优化器在选择如何优化查询时，会根据统计信息
每个线程都有一个私有的本地内存，本地内存存储了该线程以读 / 写共享变量的副本 → 每个线程都有一个私有的本地内存，本地内存存储了该线程已读 / 写共享变量的副本
Mybatis 的 Dao 接口可以有多个重载方法，但是多个接口对应的映射必须只有一个 → Mybatis 的 Dao 接口可以有多个重载方法，但是多个方法对应的映射必须只有一个