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.
- Jared.Still_at_radisys.com wrote:
> One philosophy of DW states that you build a DW that
> is
> fairly normalized, much like an OLTP database,
> albeit one
> with a temporal component and complete logging of
> transactions
> within the data.
>
> This is then used as a warehouse. The data from the
> DW is used
> to assemble data marts. These data marts are queried
> by users.
>
> They never look at the data warehouse.
>
> So to answer your question: It depends.
>
> * On how much time you have
> * do you want the ability to create new data marts
> without adding to
> the ETL system ? ( it should already be getting
> everything you need )
>
> Since you already have something that looks like a
> DW, why not
> use that to build data marts that employ star
> schemas and bitmap
> indexes? They are easier to query, and faster.
>
> I believe both Kimball and Inmon subscribe to this
> philosphy.
>
> Jared
>
>
>
>
>
>
> Gurelei <gurelei_at_yahoo.com>
> Sent by: root_at_fatcity.com
> 05/10/2002 11:43 AM
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> cc:
> Subject: data warehousing desing - to
> denormalize or not to denormalize - that is
> the question
>
>
> Hi.
>
> We are designing a small database using a data
> warehousing desing. We have created a 3rd normal
> form
> and are now debating whether and how to denormalize
> it. I see the pluses of denormalization - easier
> queries creation and tuning. What are the
> disadvantages that we should be aware of? Wasted
> space
> is not an issue because the tables a pretty small.
> What else should we consider as a potential issue?
>
> thank you
>
> __________________________________________________
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Received on Fri May 10 2002 - 15:13:28 CDT
