MySQL Database maximum connection number 100 how to increase the number of connections

MySQL database installation is complete, the default maximum number of connections is 100, the general flow slightly larger forum or Web site This connection number is far from enough, increase the default number of MySQL connection methods have two

Method One: Enter the MySQL installation directory to open the MySQL profile My.ini or my.cnf find max_connections=100 Modify for max_connections=1000 service to restart MySQL

Method Two: MySQL maximum number of connections default is 100 client login: Mysql-uusername-ppassword

Sets the new maximum number of connections to 200:mysql> set GLOBAL max_connections=200

Displays the currently running query:mysql> show processlist

Display current status:mysql> show status

Exit Client:mysql> Exit

View the current maximum number of connections: Mysqladmin-uusername-ppassword variables

Method Three: CentOS 4.4 under the MySQL 5.0.33 manually compiled version as an example to illustrate:

Vi/usr/local/mysql/bin/mysqld_safe

Find Safe_mysqld edit it, find the two lines where the mysqld starts, and then add the arguments back:

-O max_connections=1500

The specific point is the following location:

In the Red Word special Description:

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 for the root database account to see

Max_connections 1500 that the new changes have taken effect.

There is another way,

To modify the original code:

Unlock the original MySQL code, into the inside of the SQL directory modification mysqld.cc found 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 to:

{"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 to exit, and then./configure Make;make Install can achieve the same effect.