The full form of DBMS is Database Management System.
A database management system is essentially nothing more than a computerized data-keeping system.
Users of the system are given facilities to perform several kinds of operations on such a system for either manipulation of the data in the database or the management of the database structure itself.
There are several types of databases that can be used on a mainframe to exploit inverted list, hierarchic, network, or relational.
Hierarchical and relational database systems have common benefits.
RDBMS has the additional, significant advantage over the hierarchical DB of being non-navigational.
By navigational, we mean that in a hierarchical database, the application programmer must know the structure of the database.
Relational databases include the following structures:
1.Database
2.Table
3.Indexes
4.Keys
Examples of DBMS are:
1.MySQL
2.MS-SQL
3.Postgre SQL
