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Comment: Published by Scroll Versions from space ML1 and version 9.2

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Most primary databases do not have Massively Parallel Processing, so all aggregation happens on the single node that is receiving the query. This is how Oracle, NuoDB and MongoDB work. Obviously, this This moves a lot more data and cannot , is unable to use the resources of more than one machine – this approach machine, and does not scale well. 

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