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  • Common Content for Data Integration 10.5.8
  • All Products

Table of Contents

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  1. Preface
  2. Performance Tuning Overview
  3. Target Optimization
  4. Source Optimization
  5. Transformation Optimization
  6. Mapping Optimization
  7. Partitioned Mapping Optimization
  8. Run-time Optimization
  9. SQL Data Service Optimization
  10. Web Service Optimization
  11. Connections Optimization
  12. Data Transformation Optimization

Performance Tuning Guide

Performance Tuning Guide

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Early Selection Optimization with the SQL Transformation

Early Selection Optimization with the SQL Transformation

The Data Integration Service can perform early selection optimization with an SQL transformation if the filter condition references only pass-through ports and the SQL transformation does not have side effects.
The SQL transformation has side effects under the following circumstances:
  • The SQL query updates a database. The SQL query contains a statement such as as CREATE, DROP, INSERT, UPDATE, GRANT, or REVOKE.
  • The transformation returns NULL rows for SELECT statements that return no results. The rows might contain pass-through port values, SQL error information, or the NUMRowsAffected field.
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