Fix for User already has more than max_user_connections active connections in mysql database

This is an short tutorial how to fix (42000/1203): User already has more than ‘max_user_connections’ active connections in mysql database server.

You will see an error failed to connect to database.

This errors thrown from client machine connecting to database server.

In MySQL, There is a limit on the maximum number of simultaneous connections to database server.

If maximum connecttions from the same user to database is more than defined database max_user_connections.

The solution is to increase max_user_connections at database server.

MySQL has a system variable max_user_connections that can be configured at either startup or runtime.

First check how many maximum user connections are allowed using below command

show global variables like '%connections%'

It outputs following things

max_connections	4030
max_user_connections	0
reserved_super_connections	20

As per above command max_user_connections is zero that means there is no limit on number of connections allowed.

if max_user_connections is non zero value, increase it to some value.

How can you increase max_user_connections in mysql?

There are multiple ways we can configure at startup or runtime

  • startup to change maximum connections

Go to MySQL\Data\my.ini and update with below values

max_user_connections = zero or give total connection you want

the below are possible values zero number means no limit on number of connections positive number is maximum connections

  • Runtime to change maximum connections IN the command line, You can set global system variable value to zero or positive number
SET GLOBAL max_user_connections = 0 or number;

Once you set with either startup or command line, You need to restart server to take effect.

The above changes made from client machine or database server.


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