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  • PowerExchange for CDC and Mainframe 10.4.0
  • All Products

Table of Contents

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  1. Preface
  2. Part 1: PowerExchange Change Data Capture Introduction
  3. Part 2: CDC Components Configuration and Management
  4. Part 3: CDC Sources Configuration and Management
  5. Part 4: Change Data Extraction
  6. Part 5: Monitoring and Tuning
  7. Appendix A: CDC for z/OS Troubleshooting
  8. Appendix B: DTL__CAPXTIMESTAMP Time Stamps

CDC Guide for z/OS

CDC Guide for z/OS

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Reducing the Amount of Data Sent to the DB2 ECCR

Reducing the Amount of Data Sent to the DB2 ECCR

By default, DB2 sends all log records to the DB2 ECCR. The ECCR inspects the log records to find change data for registered tables of interest. This ECCR activity might cause high levels of CPU usage and I/O.
If DATA CAPTURE CHANGES is defined on many or all of the tables in the DB2 subsystem, you cannot substantially reduce the amount of data that DB2 sends to the DB2 ECCR.
If DATA CAPTURE CHANGES is defined on only a few tables, you can specify the IFI306 statement with the OPT keyword set to Y or F in the REPL2OPT DD data set to reduce the amount of data that DB2 sends to the ECCR. However, when OPT is set to Y or F, the DB2 ECCR cannot detect DB2 QUIESCE operations for tables that are registered for change data capture and cannot create event markers for these operations in the PowerExchange Logger for z/OS log files.
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