Rule Definition
A Sorter Transformation is commonly used before a Joiner or an Aggregator to improve drastically performance, when sufficient real memory is available. If "Sorted Input" property of the Joiner or Aggregator is not checked, a second sort is performed, with CPU and memory consumption, which could have a strong impact on Performance.
Remediation
Whenever possible, check "Sorted Input" property for Aggregator and Joiner following Sorter Transformation.
Reference
Informatica Velocity Methodology
Related Technologies
Technical Criterion
Efficiency - SQL and Data Handling Performance
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