Database management systems are programs that are written to store, update, and retrieve information from a database. There are many databases management system available in the market. The most popular are the Oracle, SQL Server and MS Access. The Oracle database is from the Oracle Corporation, the SQL Server and MS Access is from the Microsoft Corporation. There are freely available database like My SQL, MS Access one of the best common and free user database. These are open source databases. Database Management Systems are available for personal computers and for huge systems like mainframes. DB2 is a database from IBM for Mainframe systems.
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