怎么增大MYSQL数据库连接数_MySQL
怎么增大MySQL数据库连接数,MYSQL数据库安装完成后,默认连接数是100,流量稍微大一点的论坛或网站这个连接数是不够哟用的,那么怎么才能增加默认MYSQL连接数呢?这里给大家介绍一下具体的方法与操作步骤!
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*) &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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