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Aggregator Transformations in Informatica

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The Aggregator transformation allows you to perform aggregate calculations, such as averages and sums. The Aggregator transformation is unlike the Expression transformation, in that you can use the Aggregator transformation to perform calculations on groups. The Expression transformation permits you to perform calculations on a row-by-row basis only.

When using the transformation language to create aggregate expressions, you can use conditional clauses to filter records, providing more flexibility than SQL language.

The Informatica Server performs aggregate calculations as it reads, and stores necessary data group and row data in an aggregate cache.


After you create a session that includes an Aggregator transformation, you can enable the session option, Incremental Aggregation. When the Informatica Server performs incremental aggregation, it passes new source data through the mapping and uses historical cache data to perform new aggregation calculations incrementally. 
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