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LOBs with DB2 for z/OS: Stronger and Faster

An IBM Redbooks publication

Note: This is publication is now archived. For reference only.


Published on 29 November 2006, updated 14 November 2007

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ISBN-10: 0738496936
ISBN-13: 9780738496931
IBM Form #: SG24-7270-00

Authors: Paolo Bruni, Patric Becker, Tim Bohlsen, Burkhard Diekmann, Dima Etkin and Davy Goethals

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    The requirements for a database management system (DBMS) have included support for very large and complex data objects.

    DB2 UDB for OS/390 Version 6 introduced the support for large objects (LOBs): they can contain text documents, images, or movies, and can be stored directly in the DBMS with sizes up to 2 gigabytes per object and 65,536 TB for a single LOB column in a 4,096 partition table. The introduction of these new data types has implied some changes in the administration processes and programming techniques. The book Large Objects with DB2 for z/OS and OS/390, SG24-6571, introduced and described the usage of LOBs with DB2 for z/OS at Version 7 level.

    Major enhancements for LOB manipulation have been introduced with DB2 UDB for z/OS Version 8 and DB2 Version 9.1 for z/OS (DB2 9 in this book). These enhancements include performance functions such as the avoidance of LOB locks and DRDA LOB flow optimization, usability functions such as file reference variables, FETCH CONTINUE, and the automatic creation of objects. DB2 utilities provide integrated support with LOAD and UNLOAD, Cross Loader, REORG, CHECK DATA, and CHECK LOB.

    In this IBM Redbooks publication, we provide a totally revised description of the DB2 functions for LOB support as well as useful information about how to design and implement LOBs. We also offer examples of their use, programming considerations, and the enhanced processes used for their administration and maintenance. We also detail how SAP solutions use LOBs.

    This book replaces the previous book, Large Objects with DB2 for z/OS and OS/390, SG24-6571, for DB2 Version 8 and Version 9.1.

    Table of Contents

    Chapter 1. Introduction

    Chapter 2. Large objects with DB2

    Chapter 3. Creating LOBs

    Chapter 4. Using LOBs

    Chapter 5. SAP and LOBs

    Chapter 6. Utilities with LOBs

    Chapter 7. Data administration with LOBs

    Chapter 8. Performance with LOBs

    Appendix A. Additional material


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