问题现象研发同学执行下列语句序列 stop slave; set global slave_parallel_workers=0; start slave; 后程序 hang 住，不一会返回了2013 错误，即服务器连接异常中断，检查 mysqld error log, 发现在mysqld在将并行复制转化为串行复制的过程中异常 crash，其中错误信息为： [ERROR] Error rea.....

文章 2016-05-23 来自：开发者社区

数据库内核月报－ 2015 / 10-MySQL · 特性分析 · 跟踪Metadata lock

背景 MySQL 从5.5.3版本，对Metadata lock进行了调整，主要是MDL锁持有的周期从语句变成了事务，其原因主要是解决两个问题：问题1: 破坏事务隔离级别在repeatable read的隔离级别下，多次的select语句执行过程中，会因为其它session的DDL语句，而导致select语句执行的结果不相同，破坏了RR的隔离级别。问题2: 破坏binlog的顺序在对表....

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更新时间 2024-02-01 11:41:01

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