Re: data warehousing desing - to denormalize or not to denormalize -

• Gurelei <gurelei_at_yahoo.com> on 05/10/02 12:13:27 -0800

> Jared,
>
> Thanks for the answer. I must admit my ignorance in
> terminology as for me data warehouse and data mart a
> pretty much the same thing except for size. I
> understand that data mart is smaller. The database I'm
> referring to could probably be described as data mart
> as it is going to be rather small - a gig or so maybe.

"Data Mart" == summarized data from a Warehouse used to speed up query times. Main point to a mart is that by pre-aggregating the data the volume (and keyspace) are reduced. Mart's acutally increase total storage becuase they store the data more than once (Warehouse + agg'd into the Mart). Advantage is speed for the 90% of all queries that use agg'd data in the first place.

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