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修改MYSQL最大连接数的3种方法分享_MySQL

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Release: 2016-06-01 13:20:59
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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

推荐第一种方法,修改比较方便。

方法二:MySQL的最大连接数默认是100客户端登录:mysql -uusername -ppassword

设置新的最大连接数为200:mysql> set GLOBAL max_connections=200

显示当前运行的Query:mysql> show processlist

显示当前状态:mysql> show status

退出客户端:mysql> exit

查看当前最大连接数: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:

vi /usr/local/mysql/bin/mysqld_safe

找到safe_mysqld编辑它,找到mysqld启动的那两行,在后面加上参数 :

-O max_connections=1500

具体一点就是下面的位置:

用红字特别说明:

then $NOHUP_NICENESS $ledir/$MYSQLD

$defaults --basedir=$MY_BASEDIR_VERSION

--datadir=$DATADIR $USER_OPTION

--pid-file=$pid_file

--skip-external-locking

-O max_connections=1500

>> $err_log 2>&1 else

eval "$NOHUP_NICENESS $ledir/$MYSQLD

$defaults --basedir=$MY_BASEDIR_VERSION

--datadir=$DATADIR $USER_OPTION

--pid-file=$pid_file

--skip-external-locking $args

-O max_connections=1500 >>

$err_log 2>&1"

保存。

# service mysqld restart

# /usr/local/mysql/bin/mysqladmin -uroot -p variables

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:

{"max_connections", OPT_MAX_CONNECTIONS,

"The number of simultaneous clients allowed.", (gptr*) &max_connections,

(gptr*) &max_connections, 0, GET_ULONG, REQUIRED_ARG, 100, 1, 16384, 0, 1,

0},

把它改为:

{"max_connections", OPT_MAX_CONNECTIONS,

"The number of simultaneous clients allowed.", (gptr*) &max_connections,

(gptr*) &max_connections, 0, GET_ULONG, REQUIRED_ARG, 1500, 1, 16384, 0, 1,

0},

存盘退出,然后./configure ;make;make install可以获得同样的效果。

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