Transformations like , Aggregate , and Fuzzy Lookup are "Fully Blocking." They must read every single row into memory before they can output a single row.
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Transformations like Sort and Aggregate are asynchronous, meaning they block the data flow until every single row is read into memory. To optimize a pipeline running lookup or windowed data, perform sorting at the database engine source level using an ORDER BY statement rather than using the SSIS Sort Transformation widget. Troubleshooting Runtime Bottlenecks Transformations like , Aggregate , and Fuzzy Lookup