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 and 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

Integration Service Handling with Source Database Partitioning

Integration Service Handling with Source Database Partitioning

The Integration Service uses the following rules for database partitioning:
  • If you specify database partitioning for a database other than Oracle or IBM DB2, the Integration Service reads the data in a single partition and writes a message to the session log.
  • If the number of session partitions is more than the number of partitions for the table in the database, the excess partitions receive no data. The session log describes which partitions do not receive data.
  • If the number of session partitions is less than the number of partitions for the table in the database, the Integration Service distributes the data equally to the session partitions. Some session partitions receive data from more than one database partition.
  • When you use database partitioning with dynamic partitioning, the Integration Service determines the number of session partitions when the session begins.
  • Session performance with partitioning depends on the data distribution in the database partitions. The Integration Service generates SQL queries to the database partitions. The SQL queries perform union or join commands, which can result in large query statements that have a performance impact.


Updated July 04, 2018