How to set the maximum number of connections of MySQL

MySQLAfter the database is installed, the defaultMax connectionThe number is 100. Generally, forum orWebsiteThis number of connections is far from enough. There are two ways to increase the default number of MySQL connections.

Method 1: Go to the MySQL installation directory and open the MySQL configuration file my. ini or my. CNF to find max_connections = 100 and change it to max_connections = 1000 to restart MySQL.

Method 2: the maximum number of connections of MySQL is 100 by default. Client Logon: mysql-uusername-ppassword

Set the new maximum number of connections to 200: mysql> set global max_connections = 200

Display the currently running query: mysql> show processlist

Display Current status: mysql> show status

Exit the client: mysql> exit

View the current maximum number of connections: mysqladmin-uusername-ppassword Variables

 

Method 3: Take MySQL 5.0.33 in centos 4.4 as an example:

VI/usr/local/MySQL/bin/mysqld_safe

Find safe_mysqld and edit it. Find the two lines started by mysqld and add the following parameters:

-O max_connections = 1500

The specific point is the following position:

Note in Red:

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"

Save.

# Service mysqld restart

#/Usr/local/MySQL/bin/mysqladmin-uroot-P Variables

Enter the password of the root database account.

Max_connections 1500 indicates that the new change has taken effect.

There is another method,

Modify originalCode:

Unlock the original MySQL code and go to the SQL directory to modify mysqld. CC. Find the following line:

{"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 },

Change it:

{"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 },

Save the disk and exit./configure; Make; make install to achieve the same effect.