How to set max connections in mysql permanently? - mysql

Question

I need some help to set MAX connections value permanently in MySql. I have tried but I can't find a permanent solution. Now, I am using temporary solution by changing in command prompt like in this article.

Answer 1

Since this question shows up on the search results when people search for a solution, and now that the solution has changed, I felt it necessary to post an answer.
Ubuntu 15.04+ no longer respects the limits set in /etc/security/limits.conf. So if you set max connections and you don't see any effect, have a look at the log file at sudo vim /var/log/mysql/error.log and you'll see Changed limits: max_connections: 214 (requested 5000).
Solution:
Copy the limits for mysql from the systemd config file to /etc/systemd using:
sudo cp /lib/systemd/system/mysql.service /etc/systemd/system/
sudo vim /etc/systemd/system/mysql.service
Then add the following lines to the bottom of the file:
LimitNOFILE=infinity
LimitMEMLOCK=infinity
You could also use a finite number instead of infinity.
Now reload systemd config:
sudo systemctl daemon-reload

Answer 2

Thank you Very much i inserted the code into the MY.ini file and it solved the problem.
in c:/xampp/mysql/bin/my.ini file under the [mysqld] section i inserted the following line
**
max_connections = 250
**
Later restart the xampp server to take effect.
if we give set-variable=max_connections=250 Mysql server is not starting.
Once again thank you very much.

Answer 3

I had the same problem using Ubuntu 16.04.
Had to do it this way:
sudo vim /etc/systemd/system/mysql.service
Added the lines at the bottom of the file:
LimitNOFILE=infinity
LimitMEMLOCK=infinity
Reloaded systemd config:
sudo systemctl daemon-reload
Increased the number of files the system could open:
ulimit -n 4096
Edited my.cnf like this:
vi /etc/mysql/mysql.conf.d/mysqld.cnf
Looked for the max_connections and changed it´s value to 20000.
To make sure the settings become permanent performed a mysql service restart:
sudo service mysql restart
Went to phpmyadmin and checked the max_connections global variable using:
SHOW VARIABLES like '%max_connections';
It worked - Now when the daemon restarts I have the same max_connections that I had before.

Answer 4

you can set that in my.cnf, Mysql Doc
I quote
You can increase this value in main config file (e.g., /etc/my.cnf or /etc/mysql/my.cnf) using this syntax:
[mysqld]
set-variable=max_connections=250
i think you need to restart mysql after changes to take effect.