DB2 10 for z/OS Performance Topics

An IBM Redbooks publication

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Published on June 22, 2011, updated August 23, 2013

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ISBN-10: 0738435716
ISBN-13: 9780738435718
IBM Form #: SG24-7942-00


Authors: Paolo Bruni, Felipe Bortoletto, Ravikumar Kalyanasundaram, Glenn McGeoch, Roger Miller, Cristian Molaro, Yasuhiro Ohmori and Michael Parbs

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    Abstract

    DB2® 10 for z/OS can reduce the total DB2 CPU demand from 5-20%, compared to DB2 9, when you take advantage of all the enhancements. Many CPU reductions are built in directly to DB2, requiring no application changes. Some enhancements are implemented through normal DB2 activities through rebinding, restructuring database definitions, improving applications, and utility processing. The CPU demand reduction features have the potential to provide significant total cost of ownership savings based on the application mix and transaction types.

    Improvements in optimization reduce costs by processing SQL automatically with more efficient data access paths. Improvements through a range-list index scan access method, list prefetch for IN-list, more parallelism for select and index insert processing, better work file usage, better record identifier (RID) pool overflow management, improved sequential detection, faster log I/O, access path certainty evaluation for static SQL, and improved distributed data facility (DDF) transaction flow all provide more efficiency without changes to applications. These enhancements can reduce total CPU enterprise costs because of improved efficiency in the DB2 10 for z/OS.

    DB2 10 includes numerous performance enhancements for Large Objects (LOBs) that save disk space for small LOBs and that provide dramatically better performance for LOB retrieval, inserts, load, and import/export using DB2 utilities. DB210 can also more effectively REORG partitions that contain LOBs.

    This IBM Redbooks® publication® provides an overview of the performance impact of DB2 10 for z/OS discussing the overall performance and possible impacts when moving from version to version. We include performance measurements that were made in the laboratory and provide some estimates.

    Keep in mind that your results are likely to vary, as the conditions and work will differ.

    In this book, we assume that you are somewhat familiar with DB2 10 for z/OS.

    See DB2 10 for z/OS Technical Overview, SG24-7892-00, for an introduction to the new functions.

    Table of Contents

    Chapter 1. Introduction

    Chapter 2. Subsystem

    Chapter 3. Synergy with z platform

    Chapter 4. Table space design options

    Chapter 5. Sample workloads

    Chapter 6. SQL

    Chapter 7. Application enablement

    Chapter 8. Distributed environment

    Chapter 9. Utilities

    Chapter 10. Security

    Chapter 11. Installation and migration

    Chapter 12. Monitoring and Extended Insight

    Appendix A. Recent maintenance

     

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