Table of Contents

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  1. Preface
  2. Understanding Pipeline Partitioning
  3. Partition Points
  4. Partition Types
  5. Pushdown Optimization
  6. Pushdown Optimization Transformations
  7. Real-time Processing
  8. Commit Points
  9. Row Error Logging
  10. Workflow Recovery
  11. Stopping and Aborting
  12. Concurrent Workflows
  13. Grid Processing
  14. Load Balancer
  15. Workflow Variables
  16. Parameters and Variables in Sessions
  17. Parameter Files
  18. FastExport
  19. External Loading
  20. FTP
  21. Session Caches
  22. Incremental Aggregation
  23. Session Log Interface
  24. Understanding Buffer Memory
  25. High Precision Data
  26. POWERCENTERHELP

Advanced Workflow Guide

Advanced Workflow Guide

Automatic Buffer Memory Settings

Automatic Buffer Memory Settings

At initialization, the DTM allocates the buffer memory that the session will use at run time. You can configure the Integration Service to automatically allocate the buffer memory size or you can set the memory buffer and block size.
By default, the PowerCenter Integration Service automatically calculates the buffer memory required for a session based on the transformation requirements and the sources and targets in the mapping. The calculation is not based on the amount of memory on the host machine or on how much of that memory is available. In some cases, the PowerCenter Integration Service might allocate only a small portion of the available memory to the session.
If the buffer memory automatically calculated by the PowerCenter Integration Service does not appear to produce the memory footprint that you expect for a session, you can specify the size of the buffer memory and the size of the blocks that the PowerCenter Integration Service allocates to the session.


Updated July 04, 2018