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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

Multiple Instances of the PowerExchange Logger for z/OS

Multiple Instances of the PowerExchange Logger for z/OS

You can run multiple instances of the PowerExchange Logger for z/OS simultaneously in a single PowerExchange system. The number of instances that you use depends on your performance needs and your data-management processes.
For example, you might want to use separate instances of the PowerExchange Logger to capture changes from different branch offices of an organization.
The following situations are possible reasons for using multiple instances of the PowerExchange Logger:
  • High volume of data
  • Multiple environments. Although not required, you may want to dedicate a separate PowerExchange Logger for each data-resource type. For example, one for IMS and one for VSAM.
  • Application requirements
Up to 50 PowerExchange Loggers can attach to a PowerExchange Agent. The value of the TaskLimit parameter in the AGENTCTL parameters limits the number of PowerExchange Loggers that can attach to a PowerExchange Agent. Each PowerExchange Logger requires a minimum of 12 tasks, and uses additional tasks for log readers and archive processes.
A Post-Log Merge group can be comprised of a maximum of eight PowerExchange Loggers.

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