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 Source Filter

Lookup Source Filter

You can configure a Lookup source filter for a relational Lookup transformation that has caching enabled. Add the lookup source filter to limit the number of lookups that the Integration Service performs on a lookup source table.
When you configure a Lookup source filter, the Integration Service performs lookups based on the results of the filter statement. For example, you might need to retrieve the last name of every employee whose ID is greater than 510.
You configure the following lookup source filter on the EmployeeID column:
EmployeeID >= 510
EmployeeID is an input port in the Lookup transformation. When the Integration Service reads the source row, it performs a lookup on the cache when the value of EmployeeID is greater than 510. When EmployeeID is less than or equal to 510, the Lookup transformation does not retrieve the last name.
When you add a lookup source filter to the Lookup query for a session configured for pushdown optimization, the Integration Service creates a view to represent the SQL override. The Integration Service runs an SQL query against this view to push the transformation logic to the database.

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