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Re: Help optimizing query/index
Posted by: Peter Brawley
Date: March 08, 2012 02:53PM

The only plausible way to speed up grouping by columns across two tables is to put those two columns in one table.

Many OLAP impleentations maintain the reporting tables in real time (or close to it eg doing much of the processing in off-peak hours), the obvious purpose being what you cite, that it would otherwise take too long to assemble the fact table.

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Re: Help optimizing query/index
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