Table of Contents

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  1. Preface
  2. Transformations
  3. Source transformation
  4. Target transformation
  5. Access Policy transformation
  6. Aggregator transformation
  7. B2B transformation
  8. Chunking transformation
  9. Cleanse transformation
  10. Data Masking transformation
  11. Data Services transformation
  12. Deduplicate transformation
  13. Expression transformation
  14. Filter transformation
  15. Hierarchy Builder transformation
  16. Hierarchy Parser transformation
  17. Hierarchy Processor transformation
  18. Input transformation
  19. Java transformation
  20. Java transformation API reference
  21. Joiner transformation
  22. Labeler transformation
  23. Lookup transformation
  24. Machine Learning transformation
  25. Mapplet transformation
  26. Normalizer transformation
  27. Output transformation
  28. Parse transformation
  29. Python transformation
  30. Rank transformation
  31. Router transformation
  32. Rule Specification transformation
  33. Sequence transformation
  34. Sorter transformation
  35. SQL transformation
  36. Structure Parser transformation
  37. Transaction Control transformation
  38. Union transformation
  39. Vector Embedding transformation
  40. Velocity transformation
  41. Verifier transformation
  42. 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

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