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07.10.2007 at 03:58AM PDT, ID: 22685550
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7.0

Data Warehouse Design, Fact table with 40 attributes

Asked by andy_routledge in OLAP, Databases Miscellaneous, Oracle Database

Tags: , , , ,

I am designing a data warehouse for a telecoms company. I have read several books and articles on data warehousing including Kimballs book on Dimensional Modelling and come up with a draft design for one of the core processes.

My design has 13 Dimensions which according to kimball is perfectly legal (5 to 15 is ideal) however my fact table has a total of 40 attributes approximately half of these are facts and the others are foreign keys. Now Im using roles in my fact table where attributes are the same. For example i have 2 dimensions date and time. Each record in the fact table has 6 aliases of this

call_start_date_key
call start_time_key
call_answer_date_key
call_answer_time_key
call_end_date_key
call_end_time_key

So although theses 6 FK's theres actually only 2 dimensions. In my design i have at least 3 occasions where this sort of thing happens. My question is have I created a design that centipedes or is this perfectly fine? I'm slightly worried that although all 40 attributes in the fact table are integer or number type there are way too many. Theres no way i can drop any of them either as there things such as call duration weekend and call total retail duration. Any input on this would be greatly appreciated

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[+][-]07.10.2007 at 04:50AM PDT, ID: 19452548

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Zones: OLAP, Databases Miscellaneous, Oracle Database
Tags: fact, table, data, warehouse, design
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Solution Provided By: sujith80
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Solution Grade: B
 
 
[+][-]07.10.2007 at 01:50PM PDT, ID: 19457645

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[+][-]07.11.2007 at 04:02AM PDT, ID: 19461282

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[+][-]07.11.2007 at 11:28PM PDT, ID: 19469252

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