Most of the fields in the tables shown (Web hosting uk)
Most of the fields in the tables shown in Figure 9-25 have already been discussed for the OLTP database model analysis. The only fields not covered are the additional locations, time stamp, and product content dimensions: . Locations Locations are a hierarchy of region, country, state, and city, as shown ion Figure 9-26. Figure 9-26: Some example locations records. . Times Times are month, quarter, and year, as shown in Figure 9-27. Time stamp dimensions can contain days, hours, and possibly even minutes; however, that level of detail can generate a very large time dimension, and is probably not worth it in general. There would be too many records to maintain SQL code join query efficiency. Figure 9-27: Some example time stamp records. . Products Products are a bit of a misfit in the online auction house data warehouse database model. Products are essentially the same as the online auction house categories. Also, the price PRODUCT table PRICE field is irrelevant because there are no fixed prices for each listing category. Prices are flexible, determined by a multitude of different sellers, and ultimately the buyers making the bids. The PRODUCT table is, therefore, irrelevant to the data warehouse database model for the online auction house. The ERD in Figure 9-25 would be adjusted as shown in Figure 9-28. Time Stamp Elements MONTH 1 1 1 1 1 1 1 1 1 1 1 1 2 2 QUARTER 1 1 1 1 1 1 1 1 1 1 1 1 1 1 YEAR 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 1995 1996 Locations REGION North America North America North America North America North America North America North America North America North America North America North America North America North America North America COUNTRY Canada Canada Canada Canada Canada Canada United States United States United States United States United States United States United States United States STATE NS QB ON QB ON BC NY NM IA AK NC GA ME TX CITY Halifax Montreal Ottawa Quebec City Toronto Vancouver Albany Albuquerque Ames Anchorage Asheville Atlanta Augusta Austin 250 Chapter 9
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