This book has become the necessary tool for managing and storing data. It provides an up-to-date coverage of the database systems and explains the concepts in a simple, elegant and easy understandable format. Apart from theoretical explanations, it includes a practical approach and includes many diagrammatic illustrations, database security, transaction management, embedded SQL, dynamic SQL, indexing, hashing, data warehousing and data mining. The book can act as a complete reference for Oracle on line examination.