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记录一个mysql连接慢的问题

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Jun 01, 2016 pm 01:08 PM

问题现象是这样的：

我在一台机器上（61.183.23.23）启动了一个mysql，然后开通一个账号可以从127.0.0.1或者从61.183.23.23访问。但是遇到一个问题就是使用下面两个命令行访问的时候，速度差别非常大：

mysql –h 127.0.0.1 –u user

mysql –h 61.183.23.23 –u user

然后我使用ping，判断两个IP的速度差不多。

使用127.0.0.1的IP速度比另一个快太多了。虽然说这里的61.183.23.23需要去外网走一圈，但是速度差别怎么会差这么多。

解决办法：

mysql使用skip-name-resolve禁止掉DNS的查询。

mysql会在用户登录过程中对客户端IP进行DNS反查，不管你是使用IP登录还是域名登录，这个反查的过程都是在的。所以如果你的mysql所在的服务器的DNS有问题或者质量不好，那么就有可能造成我遇到的这个问题，DNS解析出现问题。

修改mysql配置文件

[mysqld]

skip-name-resolve

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