Common database management system
Oracle (Oracle): The database started, the world's most powerful database management system. In 2008, Sun acquired MySQL AB. In 2009, it acquired Sun (Sun Microelectronics) for $7.4 billion. Since then, the Java language has been upgraded and maintained by Oracle. MySQL also belongs to Oralce, but MySQL is an open source and free database management system.
Common database management systems are:
Oracle, MySQL, DB2, Sybase, Microsoft SqlServer (database management system supporting standard sql), SQL Server, interbase, PostgreSql
Generally Internet companies use MySQL database management systems for more reasons: their databases need to be clustered, and one database is not enough. MySQL is lightweight, open source and free, and MySQL is easy to install. The installation package is only tens to a few tens of megabytes. Hundred trillion. The Oracle database management system is a heavyweight, it is charged, and the Oracle installation is slow, and the Oracle installation package has several Gs.
Oracle database management systems are mostly used in traditional industries (such as banking systems) and government departments, because such software systems require a high level of security.