2. Evolution of Database Management Systems

Databases have been in use since the earliest days of electronic computing, but the vast majority of these were custom programs written to access custom databases. Unlike modern systems which can be applied to a wide range of databases and needs, these systems were tightly linked to the database in order to gain speed at the price of flexibility.

 The major DBMS that evolved are as follows:

•              Navigational DBMS

•              Relational DBMS

•              Multidimensional DBMS

•              Object DBMS