Note: You are currently viewing documentation for Moodle 2.2. Up-to-date documentation for the latest stable version is available here: MySQL.
MySQL is one of the supported databases that underpins a Moodle installation.
MySQL describes itself as "the most popular Open Source SQL database management system, is developed, distributed, and supported by MySQL AB. MySQL AB is a commercial company, founded by the MySQL developers. It is a second generation Open Source company that unites Open Source values and methodology with a successful business model."