Table of Contents

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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

Sequence Creation Example

Sequence Creation Example

You create the following mapping that uses a Sequence Generator transformation to generate primary keys for a relational target:
In this mapping, a Source Qualifier transformation and a Sequence Generator transformation connect to an Expression transformation.
When the Integration Service pushes transformation logic to the database, it executes the following SQL statement to create the sequence object in the source database:
CREATE SEQUENCE PM_S6UHW42OGXTY7NICHYIOSRMC5XQ START WITH 1 INCREMENT BY 1 MINVALUE 0 MAXVALUE 9223372036854775807 NOCYCLE CACHE 9223372036854775807
After the Integration Service creates the sequence object, the Integration Service executes the SQL query to process the transformation logic contained in the mapping:
INSERT INTO STORE_SALES(PRIMARYKEY, QUARTER, SALES, STORE_ID) SELECT CAST(PM_S6UHW42OGXTY7NICHYIOSRMC5XQ.NEXTVAL AS FLOAT), CAST(CAST(SALES_BYSTOREQUARTER_SRC.QUARTER AS FLOAT) AS VARCHAR2(10)), CAST(CAST(SALES_BYSTOREQUARTER_SRC.SALES AS NUMBER(10, 2)) AS NUMBER(25, 2)), CAST(SALES_BYSTOREQUARTER_SRC.STORE_ID AS NUMBER(0, 0)) FROM SALES_BYSTOREQUARTER_SRC
After the session completes, the Integration Service drops the sequence object from the database. If the session fails, the Integration Service drops and recreates the sequence object before performing recovery tasks.


Updated July 04, 2018