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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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Post-Log Merge Jobs - Service Class Criteria

Post-Log Merge Jobs - Service Class Criteria

In an environment with multiple z/OS LPARs, processes on different LPARs can write changes to the same VSAM file or IMS database. To capture changes in this environment, you must run a PowerExchange Logger for z/OS on each LPAR. Also configure a Post-Log Merge job or started task to retrieve change data from these Loggers and then merge the changes in chronological order during extraction processing.
When determining the WLM service class to assign to Post-Log Merge jobs, consider the resource usage characteristics and performance requirements of these jobs.
The service class of a Post-Log Merge job does not affect the performance of change capture processing but can affect the performance of PowerCenter extraction processing.
Post-Log Merge jobs have the following resource usage characteristics:
  • CPU usage is low to medium, depending on the volume of change data that the PowerExchange Logger is capturing and the volume of change data this is being read from the PowerExchange Logger log files.
  • Virtual memory use is low.
Post-Log Merge jobs have the following performance criteria, depending on the type of extraction processing:
  • If you run PowerCenter Real Time CDC sessions that use continuous extraction mode and need to deliver captured change data to the target with minimum latency, assign the Post-Log Merge job to the same service class that is used by the processes that perform the changes on the source VSAM file or IMS database. With this service class configuration, the Post-Log Merge job can keep up with the database processes that are performing the changes.
  • If you run PowerCenter CDC sessions that extract change data in batch mode, assign the Post-Log Merge job to a service class that is used by batch jobs.
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