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hash aggregate

Blocking/non-blocking aggregate operators

2014-06-152014-06-05 / Daniel Hutmacher / 6 Comments

Some database operations can be performed in distinctly different manners, with different impacts on query performance. One important example of such an operation is calculating an aggregate. In this article, we’ll take a look at how aggregates can be “blocking” or “non-blocking”, how it affects memory allocation, and ultimately, what impact this has on your query.

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