Database Management Systems is a core subject which explains how data is managed for applications which are used in our day to day life such as Banking Systems, Railway Reservation Systems etc The book DATABASE MANAGEMENT SYSTEMS has been written for B.Tech 3rd year students of Dr. A.P.J. Abdul Kalam Technical University. The book has been written according to the syllabus of the subject Database Management Systems and concepts have been explained well through the help of examples and diagrams. The book contains Introduction, Entity-Relationship Model, Relational Algebra, SQL, Functional Dependencies and Normalization, Distributed Databases, Transaction Processing and Concurrency Control.