技巧文集：php的mysql性能优化
php在连接mysql数据库的时候我们可以采用临时的连接，当然我们也可以采用永久连接，采用永久连接的时候因为有一次连接的开销，所以时间就大大的减少了 ，但是我们才用永久连接的时候一定要注意一下的一些问题？
永久连接在数据库崩溃或者别的原因的话，永久连接不知道数据库已经关闭，然后在去连接数据库的时候就会出错，解决的办法只有写一个方法定时的检查数据库的状态，如果出错就从新连接。
php与mysql数据库的连接的永久连接是创建一些线程，然后每一次都连接的时候就在线程池中找到一个闲置的连接，然后返回，但是apache服务器只支持一定数目的线程，当服务器的访问量特别大的时候，数据库的连接线程可能就会超出apache服务器支持的数目，这样可能回造成服务器的崩溃，所以我门要在apache服务器的配制文件中修改线程的最大数目，来保证服务器的稳定。
当有多个用户同时使用一个永久连接的时候，可能回出现数据的错误，或者是读脏数据等其他的情况，这也是我们经常要主义的问题！
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