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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 and 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

Advanced Workflow Guide

Advanced Workflow Guide

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Sharing Caches

Sharing Caches

The Integration Service handles shared lookup caches differently depending on whether the cache is static or dynamic:
  • Static cache.
    If two Lookup transformations share a static cache, the Integration Service does
    not
     allocate additional memory for shared transformations in the same pipeline stage. For shared transformations in different pipeline stages, the Integration Service
    does
     allocate additional memory.
    Static Lookup transformations that use the same data or a subset of data to create a disk cache can share the disk cache. However, the lookup keys may be different, so the transformations must have separate memory caches.
  • Dynamic cache.
    When Lookup transformations share a dynamic cache, the Integration Service updates the memory cache and disk cache. To keep the caches synchronized, the Integration Service must share the disk cache and the corresponding memory cache between the transformations.