This book provides users of IMS with a complete understanding of the product in order to maximize its efficiency and ease of use. It presents the tasks, design choices, tuning, and coding options that produce the best results. Throughout the book, the emphasis is on the interplay between data base design and programming. Key guidelines that enhance data base performance tuning are given, including many examples of how simple changes can make a big difference in performance. The book offers expert advice for beginners as well as advanced users of the IMS system, and will be of benefit to data base designers, programmers, analysts, support personnel, data processors and DL/I programmers.