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How To Solve MySQL max_user_connections Error With Reasons?

How-To-Solve-MySQL-max_user_connections-Error-With-Reasons
Read max_connections document to solve your problem. If clients encounter Too many connection errors when attempting to connect to the MySQL server, all available connections are in use by other clients. The permitted number of connections is controlled by the max_connections system variable. The default value is 151 to improve performance when MySQL is used with the Apache Web server. To support more connections, set max_connections to a larger value.

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How To Solve MySQL max_user_connections Error With Reasons?

First: Check your current database max_connection variable

SHOW VARIABLES LIKE 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 151   |
+-----------------+-------+

Then Try to increase the max_connection parameter either with running command like:

 SET GLOBAL max_connections = 300;

Or set this parameter in my.cnf that mostly is located at /etc/my.cnf

vi /etc/my.cnf
max_connections = 300

Finally: Restart MySQL service
you can also check max_user_connections. however, they are related like this:

max_connections set the total connection limit
max_user_connections set limit per user

General Question: Can this be caused by low RAM?

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Short Answer: No

Long Answer: Yes, If Ram Size is low and MySQL can’t respond as fast as needed there will be many open connections and you can easily hit the max connection.
The estimated number of max connections per 1GB of ram is 100 (if you don’t have any other process using ram at the same time). I usually use ~75 for max_connection per 1GB of RAM. Increase the RAM for a long term feasible solution.

RAM      max_connection
1GB      70      
2GB      150      
4GB      300      
8GB      500

Customization:

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Troubleshooting the Errors:

Do it with concentration and patience. Check your all steps again and all codes or scripts. If you find any error you can contact us anytime via comment or better via email, We are always here to help you.

Final Words:

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