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mysql大树据表update很慢解决_MySQL

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Release： 2016-06-01 13:29:33
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mysql大树据表update很慢解决

 

问题描述：

 

数据表千万量级，update  where gid="adadfadsfasdf"，返回结果显示耗时70ms到1s之间

 

分析：

 

表很大，那么update,可能先要取索引，再取页面，但是即使都是磁盘操作，每次磁盘操作耗费5ms，大概花费20，30ms足矣

 

所以时间肯定是花在io等待上了。

 

使用 iostat   -x  -d 1   3 显示等待时间几十毫秒

 

所以时间确实花在io等待上了

 

解决方法：

 

减少io

 

增大mysql内存，原来是10G，现在搞成50G

 

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mysql update data sheet
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