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  1. Preface
  2. Understanding Pipeline Partitioning
  3. Partition Points
  4. Partition Types
  5. Pushdown Optimization
  6. Pushdown Optimization Transformations
  7. Real-time Processing
  8. Commit Points
  9. Row Error Logging
  10. Workflow Recovery
  11. Stopping and Aborting
  12. Concurrent Workflows
  13. Grid Processing
  14. Load Balancer
  15. Workflow Variables
  16. Parameters and Variables in Sessions
  17. Parameter Files
  18. FastExport
  19. External Loading
  20. FTP
  21. Session Caches
  22. Incremental Aggregation
  23. Session Log Interface
  24. Understanding Buffer Memory
  25. High Precision Data
  26. POWERCENTERHELP

Advanced Workflow Guide

Advanced Workflow Guide

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Working with Slowly Changing Dimensions

Working with Slowly Changing Dimensions

You can push Type 1 and Type 3 slowly changing dimensions logic to a database. The slowly changing dimensions logic in a mapping can be comprised of multiple transformations. The rules and guidelines of each transformation determine how much slowly changing dimensions logic you can push to a database.
Use the following rules and guidelines when you configure the Integration Service to push slowly changing dimensions transformation logic to a database:
  • You can push transformations included in Type 1 and Type 3 slowly changing dimensions mapping to an Oracle or IBM DB2 database.
  • The source data must not have duplicate rows. The database can become deadlocked if it makes multiple updates to the same row.
  • You must create the slowly changing dimensions mapping using the Slowly Changing Dimensions Wizard version 8.5 or higher. You cannot push the slowly changing dimensions logic to the database if it was created by the Slowly Changing Dimensions Wizard from a previous version.