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  • PowerExchange for CDC and Mainframe 10.5.6
  • All Products

Table of Contents

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  1. Preface
  2. PowerExchange Navigator Introduction
  3. Data Maps
  4. Data Maps for Specific Data Sources
  5. Copybooks
  6. Registration Groups and Capture Registrations
  7. Extraction Groups and Extraction Maps
  8. Personal Metadata
  9. Database Row Test
  10. PowerExchange Navigator Examples
  11. Appendix A: PowerExchange Functions for User-Defined Fields
  12. Appendix B: User Access Method Programs
  13. Appendix C: Application Groups and Applications
  14. Appendix D: Data Map Properties
  15. Appendix E: Record, Field, and Table Properties
  16. Appendix F: DTL__CAPXTIMESTAMP Time Stamps
  17. Appendix G: Trace for Creating a Memory Map When Importing a COBOL Copybook

Navigator User Guide

Navigator User Guide

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Number of VSAM Index Buffers

Number of VSAM Index Buffers

Specifies the number of I/O buffers that VSAM uses to transmit the contents of index entries between virtual and auxiliary storage for keyed access.
A buffer is the size of a control interval in the index. Valid values for the number of index buffers (BUFNI) are from 0 through 65535. Minimum number is the number specified for STRNO. If you omit STRNO, BUFNI must be at least 1, because the default for STRNO is 1. The default is the minimum number required.
Additional index buffers improve performance by providing for the residency of some, or all, of the high-level index, which minimizes the number of high-level index records retrieved from DASD for key-direct processing.
Change the number of buffers used at a PowerExchange system level by including a VSAM statement in the DBMOVER configuration member. The value in this statement overrides any entry in the data map.
Maximum number of buffers is 255, which includes 254 data buffers and one insert buffer. Default is the minimum number required.
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