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MySQL is free and opensource software under the terms of the GNU General Public License. MySQL was owned by the Swedish company MySQLAB. 

Sun Microsystem acquire Mysql in 2008, and in 2009 Oracle acquire Sun Microsystem. 

·       Some more databases which are uses in the Linux are,

o   MONGODB

o   MARIADB

o   CASSENDRA

o   POSTGRESQL

·       Service: /etc/init.d/mysqld

·       Configuration file: /etc/my.cnf

·       Database Directory: /var/lib/mysql

·       User of MySql: root

·       Port Number: 3306