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Two bits of Information I picked up from our principal Informatica Architect. When I used these, it did really work wonders.

  • Aggregators and joiners should have sorted input.   The Sorter Transformation sorts rows more efficiently that the Aggregator Transformation.   This helps improve the performance of the workflow.
  • Limit the number of Aggregators in a mapping. A high number of Aggregators can increase I/O activity on the cache directory. Unless the seek/access time is fast on the directory itself, having too many Aggregators can cause a bottleneck. Similarly, too many Lookups in a mapping causes contention of disk and memory, which can lead to thrashing, leaving insufficient memory to run a mapping efficiently.
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