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Message Posted: Thu, 01 Dec 2011 @ 21:09:20 GMT

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Subj:   Re: The "Group By" slows down the result in a query
From:   Joe Gleason

What version of Teradata are you running? I might be wrong, but I think in TD 13.10 counts are taken from the dictionary which may explain the count performance. Are you applying any kind of a filter to your query? I agree it looks like an Aggregate join index candidate if the cost associated with updates is not too great. Of course it is kind of hard to tell without knowing the pi's, explain, joins, etc.


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