2台做事器，一台跑iis+php，一台跑mysql，和以往一样配置好环境，测试页面统统OK
跑运用的时候创造php访问mysql速率很慢，这种情形在以前从未创造过，虽然2台做事器并非在同一网段中，但是ping数值基本上都在1,2ms之间，tcp连接该当不是问题关健，google往后找到答案，在my.ini文件的[mysqld]部分加入:skip-name-resolve，保存文件，重启mysql，统统OK啦，速率象飞一样了
新版本的mysql配置起来不象以前的那个傻瓜化了，这个问题折腾了我一上午的韶光，晚上回来总算是办理了，嘿嘿，又学到一些东西。
Windows 2003下的MySQL 5做事器，本机连接到MySQL做事非常快，局域网内有两台Linux机器，有一台连接很快，其余一台输入密码后要等好几秒钟才能连上。
办理办法：
在MySQL做事器的配置中增加一个如下配置后速率飞快。
[mysqld]
skip-name-resolve
附录：( How MySQL uses DNS )
When a new thread connects to mysqld, mysqld will spawn a new thread to handle the request. This thread will first check if the hostname is in the hostname cache. If not the thread will call gethostbyaddr_r() and gethostbyname_r() to resolve the hostname.
If the operating system doesn’t support the above thread-safe calls, the thread will lock a mutex and call gethostbyaddr() and gethostbyname() instead. Note that in this case no other thread can resolve other hostnames that is not in the hostname cache until the first thread is ready.
You can disable DNS host lookup by starting mysqld with -skip-name-resolve. In this case you can however only use IP names in the MySQL privilege tables.
If you have a very slow DNS and many hosts, you can get more performance by either disabling DNS lookop with -skip-name-resolve or by increasing the HOST_CACHE_SIZE define (default: 128) and recompile mysqld.
You can disable the hostname cache with -skip-host-cache. You can clear the hostname cache with FLUSH HOSTS or mysqladmin flush-hosts.
If you don’t want to allow connections over TCP/IP, you can do this by starting mysqld with -skip-networking.
PHP远程连接MYSQL速率慢,有时远程连接到MYSQL用时4-20秒不等,本地连接MYSQL正常,涌现这种问题的紧张缘故原由是,默认安装的MYSQL开启了DNS的反向解析,在MY.INI(WINDOWS系统下)或MY.CNF(UNIX或LINUX系统下)文件的[mysqld]下加入skip-name-resolve这一句。
MYSQL远程连接速率慢的办理方法
在局域网内连接其他机器的MYSQL,创造速率慢的很,不知道什么缘故原由,总有几秒的延迟.
后来在网上创造办理方法,my.ini里面添加
[mysqld]
skip-name-resolve
skip-grant-tables
这样速率就快了!
skip-name-resolve
选项就能禁用DNS解析，连接速率会快很多。不过，这样的话就不能在MySQL的授权表中利用主机名了而只能用ip格式。
若利用-skip-grant-tables系统将对任何用户的访问不做任何访问掌握，但可以用 mysqladmin flush-privileges或mysqladmin reload来开启访问掌握;默认情形是show databases语句对所有用户开放，
如果mysql做事器没有开远程帐户，就在my.ini里面加上skip-grant-tables
