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Message Posted: Tue, 25 May 2004 @ 11:47:52 GMT
I have enjoyed and learned a lot from reading this forum, this is my first post.
Daily we "generate" (build from scratch) a lot of aggregate tables from base-tables. Of course, performance is crucial.
The aggregation always involves a join to one or more (small) dimension tables.
Initially I didn't think I could influence the sum-step in any way. But it makes a lot of difference whether aggregates are computed locally or globally.
We achieve "locally" computation if the PI of the base- and aggregate-table are identical (and the join is local).
1) What exactly is going on when aggregates are computed globally?
2) Will aggregates be computed locally only if PI is the same?
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