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禁止死锁检测来提升高并发MySQL性能_MySQL

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Release： 2016-06-01 13:44:20
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在一个高并发的MySQL服务器上，事务会递归检测死锁，当超过一定的深度时，性能的下降会变的不可接受。FACEBOOK早就提出了禁止死锁检测。

我们做了一个实验，在禁止死锁检测后，TPS得到了极大的提升，如下图所示：

/

 

禁止死锁检测后，即使死锁发生，也不会回滚事务，而是全部等待到超时

Patch比较简单，直接在死锁检测前加一层判断即可：

if (innobase_deadlock_check && UNIV_UNLIKELY(lock_deadlock_occurs(lock, trx))) 

。。。。

innobase_deadlock_check是在innodb里新加的系统变量，用于控制是否打开死锁检测

 

摘自 zhaiwx1987

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