Mysql "too many connections"网站持续连接数据库失败。。
今天下午网站持续出现数据库连接不上的问题，重启一下mysql会好一些，但是过一段时间后又会出现数据库连接不上的问题。
查看monitorix发现有一异常，请技术大拿帮忙指点，初次遇到这样的问题，GoogleAnalytics 显示实时流量大约100左右，正常情况下不会出现这种现象。
求指教！
回复内容：
今天下午网站持续出现数据库连接不上的问题，重启一下mysql会好一些，但是过一段时间后又会出现数据库连接不上的问题。
查看monitorix发现有一异常，请技术大拿帮忙指点，初次遇到这样的问题，GoogleAnalytics 显示实时流量大约100左右，正常情况下不会出现这种现象。
求指教！
如果你的PHP采用持久连接访问MySQL(一个PHP-FPM进程保持一个MySQL持久连接,省去每次请求重复建立连接的开销),那么PHP-FPM的进程数pm.max_children不要多于MySQL的最大连接数max_connections(默认151).如果你用的是Apache,httpd的进程数也不要多于MySQL的最大连接数.
有可能某个（某些）查询随着数据的增加出现了性能问题，导致很多SQL被堵住了。可以通过下面命令查看当时的SQL情况
<code>show full processlist; </code>
另外可以开启MySQL的慢查询日志记录下那些耗时的查询，然后针对他们进行优化。
还有一种情况：硬盘写满了。
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