DATABASE MANAGEMENT SYSTEM (DBMS) technically speaking, is a software system that uses a standard method of cataloging, retrieving, and running queries on data. The DBMS manages incoming data, organizes it, and provides ways for the data to be modified or extracted by users of other programs. This book titled Database Management Systems concentrates on the technical issues of the database system. The book includes SQL and PL/SQL programming concepts. The reader using the book can become familiar with all the concepts of SQL query language. In addition the book also includes the transaction concepts and database design and storage structures.