Home Database Mysql Tutorial 修改MYSQL最大连接数的3种方法分享

修改MYSQL最大连接数的3种方法分享

Jun 07, 2016 pm 06:03 PM
mysql Maximum number of connections

修改MYSQL最大连接数的3种方法分享,需要的朋友可以参考下。

mysql -uusername -ppassword
mysqladmin -uroot -pwshengzhan variables;
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 |find "max_con"
MYSQL数据库安装完成后,默认最大连接数是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*) amp;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*) amp;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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