DB2 is a database
product from IBM.DB2
for z/OS is a relational database management system
that runs on the mainframe. It is a Relational
Database Management System (RDBMS). DB2 is designed to store, analyze and
retrieve the data efficiently.
A relational database is
a database in which all of the data is logically contained in tables. These
databases are organized according to the relational model. In a relational
database, referential integrity ensures data integrity by enforcing rules with
referential constraints, check constraints, and
triggers.
Evolution of DB2
In
1983, DB2 for MVS Version 1 was born. “DB2” was used toindicate a shift from hierarchical
databases—such as the Information Management System(IMS) popular at the
time—to the new relational databases. DB2 development continued onmainframe
platforms as well as on distributed platforms
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