VSAM Demystified

An IBM Redbooks publication

Published 05 March 2013, updated 24 August 2022

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ISBN-10: 0738437433
ISBN-13: 9780738437439
IBM Form #: SG24-6105-02
(458 pages)

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Authors: Mary Lovelace, Jose Dovidauskas, Alvaro Salla, Valeria Sokal


Virtual Storage Access Method (VSAM) is one of the access methods used to process data. Many of us have used VSAM and work with VSAM data sets daily, but exactly how it works and why we use it instead of another access method is a mystery.

This book helps to demystify VSAM and gives you the information necessary to understand, evaluate, and use VSAM properly. This book also builds upon the subject of Record Level Sharing and DFSMStvs. It clarifies VSAM functions for application programmers who work with VSAM. The practical, straightforward approach should dispel much of the complexity associated with VSAM. Wherever possible an example is used to reinforce a description of a VSAM function.

This IBM® Redbooks® publication is intended as a supplement to existing product manuals. It is intended to be used as an initial point of reference for VSAM functions.

Table of contents

Chapter 1. VSAM basics
Chapter 2. Managing your VSAM data sets
Chapter 3 .Guidelines for ICF catalog and VSAM
Chapter 4. VSAM performance
Chapter 5. VSAM Record Level Sharing
Chapter 5. DFSMStvs
Chapter 6. VSAM problem determination and recovery
Appendix A. Sample code
Appendix B. Miscellaneous performance items

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