Table of Contents

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  1. Preface
  2. Working with Transformations
  3. Aggregator Transformation
  4. Custom Transformation
  5. Custom Transformation Functions
  6. Data Masking Transformation
  7. Data Masking Examples
  8. Expression Transformation
  9. External Procedure Transformation
  10. Filter Transformation
  11. HTTP Transformation
  12. Identity Resolution Transformation
  13. Java Transformation
  14. Java Transformation API Reference
  15. Java Expressions
  16. Java Transformation Example
  17. Joiner Transformation
  18. Lookup Transformation
  19. Lookup Caches
  20. Dynamic Lookup Cache
  21. Normalizer Transformation
  22. Rank Transformation
  23. Router Transformation
  24. Sequence Generator Transformation
  25. Sorter Transformation
  26. Source Qualifier Transformation
  27. SQL Transformation
  28. Using the SQL Transformation in a Mapping
  29. Stored Procedure Transformation
  30. Transaction Control Transformation
  31. Union Transformation
  32. Unstructured Data Transformation
  33. Update Strategy Transformation
  34. XML Transformations

Transformation Guide

Transformation Guide

Lookup Caches

Lookup Caches

You can configure a Lookup transformation to cache the lookup file or table. The Integration Service builds a cache in memory when it processes the first row of data in a cached Lookup transformation. It allocates memory for the cache based on the amount you configure in the transformation or session properties. The Integration Service stores condition values in the index cache and output values in the data cache. The Integration Service queries the cache for each row that enters the transformation.
The Integration Service also creates cache files by default in the $PMCacheDir. If the data does not fit in the memory cache, the Integration Service stores the overflow values in the cache files. When the session completes, the Integration Service releases cache memory and deletes the cache files unless you configure the Lookup transformation to use a persistent cache.
When configuring a lookup cache, you can configure the following options:
  • Persistent cache
  • Recache from lookup source
  • Static cache
  • Dynamic cache
  • Shared cache
  • Pre-build lookup cache
You can use a dynamic cache for relational or flat file lookups.

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