Optimizing MySQL database using mysqltuner.pl

MySQLTuner is a script written in perl which based to MySQL logs, it generates some pretty safe suggestions about which variables can be changed in MySQL config file for a little extra performance First, we download the script and make it executable: Then we run it: It is for best, that MySQL has not little uptime when running the script, the longer the more accurate suggestions it will be able to output. As opposed to the "MySQL started within last 24 hours – recommendations may be inaccurate." error message if you attempt to run the script right after a MySQL restart. You should carefully read the results, especially the recommendations at the end which shows exactly which variables you should adjust in the [mysqld] section of your my.cnf file (/etc/mysql/my.cnf for Debian and Ubuntu). Whenever you change your my.cnf, make sure that you restart MySQL service. After changes to my.cnf file, you can come back after 2 or 3 days and run mysqltuner.pl again, in order to see if there are any additional suggestions to improve the MySQL performance. This way you are able to optimize your MySQL's settings step by step. Give extra attention to "Query cache efficiency" percentage and note down it's change. This method is ideal for learning as well, while you may come up with random configurations across the Internet matching your server's specification, they could become confusing when you have to change a bunch of variables at once or it wouldn't give you the time to study how every variable change affects your MySQL server performance. Please note: We hold no responsibility for any changes you make to your my.cnf config file. Also we strongly suggest you to take backups not only from my.cnf config file itself but take whole database backups as well.