以下的文章主要介绍的是正确修改MySQL最大连接数的三种好用方案,我们大家都知道MySQL数据库在安装完之后,默认的MySQL数据库,其最大连接数为100,一般流量稍微大一点的论坛或网站这个连接数是远远不够的,增加默认MySQL连接数的方法有两个。 方法一: 进入
以下的文章主要介绍的是正确修改MySQL最大连接数的三种好用方案,我们大家都知道MySQL数据库在安装完之后,默认的MySQL数据库,其最大连接数为100,一般流量稍微大一点的论坛或网站这个连接数是远远不够的,增加默认MySQL连接数的方法有两个。
方法一:
进入MySQL安装目录 打开MySQL配置文件 my.ini 或 my.cnf查找 max_connections=100 修改为 max_connections=1000 服务里重起MySQL即可
方法二:
MySQL最大连接数默认是100客户端登录:
<ol class="dp-xml"><li class="alt">MySQL<span> -uusername -ppassword </span> </li></ol>
设置新的MySQL最大连接数为200:
<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> set GLOBAL </span><span class="attribute">max_connections</span><span>=</span><span class="attribute-value">200</span><span> </span></span> </li></ol>
显示当前运行的Query:
<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> show processlist </span></span> </li></ol>
显示当前状态:
<ol class="dp-xml"><li class="alt">MySQL<span><span class="tag">></span><span> show status </span></span> </li></ol>
退出客户端:MySQL> exit
查看当前MySQL最大连接数:MySQLadmin -uusername -ppassword variables
方法三:
以centos 4.4 下面的MySQL 5.0.33 手工编译版本为例说明:
<ol class="dp-xml"><li class="alt"> <span>vi /usr/local/MySQL/bin/</span>MySQL<span>d_safe </span> </li></ol>
找到safe_MySQLd编辑它,找到MySQLd启动的那两行,在后面加上参数 :
<ol class="dp-xml"><li class="alt"><span><span>-O </span><span class="attribute">max_connections</span><span>=</span><span class="attribute-value">1500</span><span> </span></span></li></ol>
具体一点就是下面的位置:
用红字特别说明:
<ol class="dp-xml"> <li class="alt"><span>then $NOHUP_NICENESS $ledir/$MySQLD </span></li> <li> <span>$defaults </span><span class="attribute">--basedir</span><span>=$MY_BASEDIR_VERSION </span> </li> <li class="alt"> <span class="attribute">--datadir</span><span>=$DATADIR $USER_OPTION </span> </li> <li> <span class="attribute">--pid-file</span><span>=$pid_file </span> </li> <li class="alt"><span>--skip-external-locking </span></li> <li> <span>-O </span><span class="attribute">max_connections</span><span>=</span><span class="attribute-value">1500</span><span> </span> </li> <li class="alt"> <span class="tag">></span><span class="tag">></span><span> $err_log 2</span><span class="tag">></span><span>&1 else </span> </li> <li> <span>eval "$NOHUP_NICENESS $ledir/$</span>MySQL<span>D </span> </li> <li class="alt"> <span>$defaults </span><span class="attribute">--basedir</span><span>=$MY_BASEDIR_VERSION </span> </li> <li> <span class="attribute">--datadir</span><span>=$DATADIR $USER_OPTION </span> </li> <li class="alt"> <span class="attribute">--pid-file</span><span>=$pid_file </span> </li> <li><span>--skip-external-locking $args </span></li> <li class="alt"> <span>-O </span><span class="attribute">max_connections</span><span>=</span><span class="attribute-value">1500</span><span> </span><span class="tag">></span><span class="tag">></span><span> </span> </li> <li> <span>$err_log 2</span><span class="tag">></span><span>&1" </span> </li> </ol>
保存。
<ol class="dp-xml"> <li class="alt"><span># service MySQLd restart </span></li> <li> <span># /usr/local/</span>MySQL<span>/bin/</span>MySQL<span>admin -uroot -p variables </span> </li> </ol>
输入root数据库账号的密码后可看到
max_connections 1500 即新改动已经生效。
还有一种方法,
修改原代码:
解开MySQL的原代码,进入里面的sql目录修改MySQLd.cc找到下面一行:
<ol class="dp-xml"> <li class="alt"><span><span>{"max_connections", OPT_MAX_CONNECTIONS, </span></span></li> <li><span>"The number of simultaneous clients allowed.", (gptr*) &max_connections, </span></li> <li class="alt"><span>(gptr*) &max_connections, 0, GET_ULONG, REQUIRED_ARG, 100, 1, 16384, 0, 1, </span></li> <li><span>0}, </span></li> </ol>
把它改为:
<ol class="dp-xml"> <li class="alt"><span><span>{"max_connections", OPT_MAX_CONNECTIONS, </span></span></li> <li><span>"The number of simultaneous clients allowed.", (gptr*) &max_connections, </span></li> <li class="alt"><span>(gptr*) &max_connections, 0, GET_ULONG, REQUIRED_ARG, 1500, 1, 16384, 0, 1, </span></li> <li><span>0}, </span></li> </ol>
存盘退出,然后./configure ;make;make install可以获得同样的效果。以上的相关内容就是对修改MySQL最大连接数的3种方法的介绍,望你能有所收获。