Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Aggregator transformation
  6. Cleanse transformation
  7. Data Masking transformation
  8. Deduplicate transformation
  9. Expression transformation
  10. Filter transformation
  11. Hierarchy Builder transformation
  12. Hierarchy Parser transformation
  13. Hierarchy Processor transformation
  14. Input transformation
  15. Java transformation
  16. Java transformation API reference
  17. Joiner transformation
  18. Labeler transformation
  19. Lookup transformation
  20. Mapplet transformation
  21. Normalizer transformation
  22. Output transformation
  23. Parse transformation
  24. Python transformation
  25. Rank transformation
  26. Router transformation
  27. Rule Specification transformation
  28. Sequence Generator transformation
  29. Sorter transformation
  30. SQL transformation
  31. Structure Parser transformation
  32. Transaction Control transformation
  33. Union transformation
  34. Velocity transformation
  35. Verifier transformation
  36. Web Services transformation

Transformations

Transformations

Rebuilding the lookup cache

Rebuilding the lookup cache

You can rebuild the lookup cache if you think the lookup source changed since the last time
Data Integration
built the persistent cache.
When you rebuild a cache,
Data Integration
creates new cache files, overwriting existing persistent cache files.
Data Integration
writes a message to the session log when it rebuilds the cache.
If
Data Integration
cannot reuse the cache, it rebuilds the cache or fails the
mapping
task. The behavior can differ based on whether the cache is named or unnamed.
The following table summarizes how
Data Integration
handles named and unnamed persistent caches when the mapping changes between runs:
Mapping changes between runs
Named cache
Unnamed cache
Data Integration
cannot locate cache files. For example, the file no longer exists.
Rebuilds cache
Rebuilds cache
Enable or disable the Enable High Precision option in the
mapping
task advanced session properties.
Fails
mapping
task
Rebuilds cache
Edit the transformation in the Mapping Designer or Mapplet Designer, excluding editing the transformation description.
Fails
mapping
task
Rebuilds cache
Edit the mapping, excluding the Lookup transformation.
Reuses cache
Rebuilds cache
Change the number of partitions in the pipeline that contains the Lookup transformation.
Fails
mapping
task
Rebuilds cache
Change database connection or the file location used to access the lookup table.
Fails
mapping
task
Rebuilds cache