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

Cache Comparison

Cache Comparison

The Integration Service performs differently based on the type of lookup cache that you configure.
The following table compares Lookup transformations with an uncached lookup, a static cache, and a dynamic cache:
Uncached
Static Cache
Dynamic Cache
The Integration Service does not insert or update the cache.
The Integration Service does not insert or update the cache.
The Integration Service can insert or update rows in the cache as it passes rows to the target.
You can use a relational lookup.
You can use a relational, flat file, or pipeline lookup.
You can use a relational, flat file, or Source Qualifier lookup.
When the condition is true, the Integration Service returns a value from the lookup table or cache.
When the condition is not true, the Integration Service returns the default value for connected transformations and NULL for unconnected transformations.
When the condition is true, the Integration Service returns a value from the lookup table or cache.
When the condition is not true, the Integration Service returns the default value for connected transformations and NULL for unconnected transformations.
When the condition is true, the Integration Service either updates rows in the cache or leaves the cache unchanged, based on the row type. This indicates that the row is in the cache and target table. You can pass updated rows to a target.
When the condition is not true, the Integration Service either inserts rows into the cache or leaves the cache unchanged, based on the row type. This indicates that the row is not in the cache or target. You can pass inserted rows to a target table.

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