为何连接 MySQL 数据库失败频繁
连接mySQL数据库失败频繁，主要是什么原因造成的? 一年前，我开发了一个网站，租用的是linux下PHP+mySQL的虚拟空间，之前一直工作正常。 近半年来，却频繁出现连接数据库失败错误(一周1~2次)，需要找空间商重启mysql服务才行： Warning: mysql_connect(): Ca
连接mySQL数据库失败频繁，主要是什么原因造成的? 一年前，我开发了一个网站，租用的是linux下PHP+mySQL的虚拟空间，之前一直工作正常。
近半年来，却频繁出现连接数据库失败错误(一周1~2次)，需要找空间商重启mysql服务才行：
Warning: mysql_connect(): Can 't connect to MySQL server on 'xx.xx.xx.xx ' (4) in /www/users/1b2g.com/xxxx.php on line xxxx
找空间商投诉，空间商说是我自己的问题，，说同主机的其他网站没有类似问题。
在网上搜索，似乎有些网友说，操作数据库不能用mysql_connect()和mysql_close()开关。照文中指示，将mysql_connect()改成了mysql_pconnect(),似乎正常了半个月时间。但是这半个月恰好因为百度调整，我的网站流量下降了。这2天，流量恢复，问题再度出现，而且不再是1周1~2，是天天出现:
Warning: mysql_pconnect(): Can 't connect to MySQL server on 'xx.xx.xx.xx ' (4) in /www/users/1b2g.com/xxxx.php on line xxxx
特别是今天，重启了也没用，又坏了，又联系不到客服，急死了。
请大家帮忙找找，到底是啥原因?是否和流量大小相关?应该怎么解决，谢谢!
回答：对于这个疑问，当时有人提出建议：优化一下程序,每页不要有过多的查询. 特别是循环体里面,尽量不要再有查询,否则很容易堵塞。应该考虑使用连接池
但是提问者又出现了问题：我已经尽可能减少每个页面的数据库连接数了。
曾经最开始的时候有个页面的连接数是比较多(因为开始为了代码复用，用了iframe嵌套)，后来经优化最多的1个页面已经减到4个;其他一般1~2个。
昨天我已经把所有页面的连接数都降到2个以下，用户访问最多的页面(占访问总量的80%)只有1个连接。
但是今天中午问题又出现了。
从现象来看， 'xx.xx.xx.xx '应该你是用了域名或者IP作为host名，这样一旦DNS或者网关出问题，就会连不上本机端口，建议你使用localhost作为host名。localhost还会在不支持socket的时候自动使用管道连接本机，不会出现连接问题。
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