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  1. Preface
  2. Performance Tuning Overview
  3. Bottlenecks
  4. Optimizing the Target
  5. Optimizing the Source
  6. Optimizing Mappings
  7. Optimizing Transformations
  8. Optimizing Sessions
  9. Optimizing Grid Deployments
  10. Optimizing the PowerCenter Components
  11. Optimizing the System
  12. Using Pipeline Partitions
  13. Appendix A: Performance Counters

Performance Tuning Guide

Performance Tuning Guide

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Using Operators Instead of Functions

Using Operators Instead of Functions

The Integration Service reads expressions written with operators faster than expressions with functions. Where possible, use operators to write expressions. For example, you have the following expression that contains nested CONCAT functions:
CONCAT( CONCAT( CUSTOMERS.FIRST_NAME, ‘ ’) CUSTOMERS.LAST_NAME)
You can rewrite that expression with the || operator as follows:
CUSTOMERS.FIRST_NAME || ‘ ’ || CUSTOMERS.LAST_NAME