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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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Relational Source

Relational Source

A relational source might produce data that is not the same or in the same order between workflow runs. When you configure recovery to resume from the last checkpoint, the Integration Service stores the SQL result in a cache file to guarantee the output order for recovery.
If you know the SQL result will be the same between workflow runs, you can configure the source qualifier to indicate that the data is repeatable and deterministic. When the relational source output is deterministic and the output is always repeatable, the Integration Service does not store the SQL result in a cache file. When the relational output is not repeatable, the Integration Service can skip creating the cache file if a transformation in the mapping always produces ordered data.