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

Working with Caches

Working with Caches

The Integration Service creates index and data caches for the Aggregator, Rank, Joiner, Sorter, and Lookup transformations. When the session contains more than one partition, the transformation threads may be distributed to more than one node in the grid. To create a single data and index cache for these transformation threads, verify that the root directory and cache directory point to the same location for all nodes in the grid.
When the Integration Service creates a cache for a Lookup transformation in a shared location, it builds a cache for the first partition group, and subsequent partition groups use this cache. When you do not configure a shared location for the Lookup transformation cache files, each service process on a separate node fetches data from the database or source files to create a cache. If the source data changes frequently, the caches created on separate nodes can be inconsistent.


Updated July 04, 2018