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English
  • PowerExchange for CDC and Mainframe 10.4.0
  • 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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Using VSAM Control Interval Access

Using VSAM Control Interval Access

Control interval (CI) access is a read option that causes the VSAM access method to use direct control interval reads to retrieve data records.
If you extract all data from the VSAM data set, this option might improve sequential read performance. If you specify a WHERE clause when retrieving the data, CI access provides no performance benefit.
To select CI access at the data map level, select the CI ACCESS option on the
Access Method
 tab in the
Data Map Properties
 dialog box. The
CI ACCESS
 option is valid for KSDS, ESDS, and RRDS access methods.
CI access is not supported for compressed VSAM data sets or VSAM data sets with spanned records.
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