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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Data Warehouse design
Inder - Offhand I'd say everything depends on how much data you are loading,
and the available time window. We do the type of validation you suggest on
our DW, but it is relatively small in the universe of DWs and we only load
it on the weekend. On a really large DW, your scheme might cause the load
times to be unreasonably large. What I have heard from the really large
sites is that they often use Unix utilities to perform data cleaning before
loading.
Often the main advantage of primary keys is to help prevent someone at your site from accidentally loading the same data twice.
Dennis Williams
DBA, 20% OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Wednesday, June 12, 2002 11:03 AM
To: Multiple recipients of list ORACLE-L
Hi,
I am in the process of designing the data warehouse. My Question is can I define the relationship between dimension tables. Like I have country,customer and time zone dimension tables. Can I add relationship between customer,country and time zone just to validate the data before load whether the country and zip code is correct or should I integrate the country and time zone with customer itself. If I integrate this. Is it going to affect the performance. 'cos for every record it is going to validate all these things before load.
Can I create sequences for primary keys(fact tables and for some of the dimenasion tables also). Is it OK to have a sequence as primary key.
I need your expert views on this.
Regards,
--
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Author:
INET: Inder.Singh_at_gecits.ge.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed Jun 12 2002 - 11:45:36 CDT
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