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IBM® Database 2, commonly referred to as DB2, and became generally available in the fall of 1983. DB2 was marketed as a relational database management system for the MVS operating system.

A more complete description is that DB2 is a relational database management system that uses the industry standard Structured Query Language (SQL) as a central component. A relational database system presents all information in the form of tables

 

Links:

DB2 V9.1 for z/OS SQL Reference

DB2 V9.1 for z/OS Application Programming and SQL Guide

DB2 V9.1 for z/OS Command Reference

DB2 V9.1 for z/OS Utility Guide and Reference