MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation. - MySQL is a database management system. - MySQL databases are relational. - MySQL software is Open Source. - The MySQL Database Server is very fast, reliable, scalable, and easy to use. - MySQL Server works in client/server or embedded systems. - A large amount of contributed MySQL software is available. MySQL is installed under /opt/mysql and doesn't conflict with mariadb. The unix socket is /opt/mysql/var/run/mysql.sock by default.