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Table of Contents

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  1. Preface
  2. Mappings
  3. Mapplets
  4. Mapping Parameters
  5. Where to Assign Parameters
  6. Mapping Outputs
  7. Generate a Mapping from an SQL Query
  8. Dynamic Mappings
  9. How to Develop and Run a Dynamic Mapping
  10. Dynamic Mapping Use Cases
  11. Mapping Administration
  12. Export to PowerCenter
  13. Import From PowerCenter
  14. Performance Tuning
  15. Pushdown Optimization
  16. Partitioned Mappings
  17. Developer Tool Naming Conventions

Developer Mapping Guide

Developer Mapping Guide

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Disable Partitioning for a Transformation

Disable Partitioning for a Transformation

A partitioned Decision, Java, or SQL transformation might not return the same result for each mapping run. You can disable partitioning for these transformations so that the Data Integration Service uses one thread to process the transformation. The Data Integration Service can use multiple threads to process the remaining mapping pipeline stages.
In a Java or SQL transformation, the
Partitionable
 advanced property is selected by default. Clear the advanced property to disable partitioning for the transformation.
In a Decision transformation, the
Partitionable
 advanced property is cleared by default. Select the advanced property to enable partitioning for the transformation.
The reason that you might want to disable partitioning for a transformation depends on the transformation type.

Decision Transformation

You might want to disable partitioning for a Decision transformation that uses a numeric function. The numeric functions CUME, MOVINGSUM, and MOVINGAVG calculate running totals and averages on a row-by-row basis. If a partitioned Decision transformation includes one of these functions, each thread processes the function separately. Each function calculates the result using a subset of the data instead of all of the data. Therefore, a partitioned transformation that uses CUME, MOVINGSUM, or MOVINGAVG functions might not return the same calculated result with each mapping run.

Java Transformation

Disable partitioning for a Java transformation when the Java code requires that the transformation be processed with one thread.

SQL Transformation

Disable partitioning for an SQL transformation when the SQL queries require that the transformation be processed with one thread. Or, you might want to disable partitioning for an SQL transformation so that only one connection is made to the database.
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