how to estimate the size of the aggregates in a DW environment

From: Gurelei <gurelei_at_yahoo.com>
Date: Fri, 23 May 2003 06:32:07 -0800
Message-ID: <F001.005A165E.20030523063207@fatcity.com>

Hi.

I'm looking for a ballpark estimate of a size of aggregates for a DW. I have estimates for the sizes of the tables. I know what agregation will be needed
(daily, weekly, monthly) and for how long the
aggregate data will be retained. I'm struggling though with estimating the number of rows in an aggregate table. The base tables will have data on a half-hourly level. I thought that I would divide the number of rows by 48 to get to a daily aggregate. But that will assume that I will have the same key data througout the month - the same users, the same products etc. And this is not likely to be the case. Is there other approach I can use in this situation?

thanks

Gene

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Author: Gurelei
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Received on Fri May 23 2003 - 09:32:07 CDT