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

Unconnected Lookup Transformation

Unconnected Lookup Transformation

Use the following rules and guidelines when you configure the Integration Service to push an unconnected Lookup transformation to a database:
  • The database might perform slower than the Integration Service if the session contains multiple unconnected lookups. The generated SQL might be complex because the Integration Service creates an outer join each time it invokes an unconnected lookup. Test the session with and without pushdown optimization to determine which session has better performance.
  • Configure the session for pushdown optimization with a view.
The Integration Service processes the unconnected Lookup transformation if any of the following conditions are true:
  • The lookup connection is not pushdown compatible with the source connection.
  • You configure target-side pushdown optimization.
  • The transformation is downstream from an Aggregator transformation.
  • The transformation is active and looks up from a Netezza database.


Updated July 04, 2018