Web hosting bandwidth - Figure 9-22: Analyzing the facts in a data
Figure 9-22: Analyzing the facts in a data warehouse database model. In Figure 9-20, the three categories in the OLTP database model can be amalgamated into a single hierarchical category table. The merge of the three tables is done by including a parent reference in the new category table, allowing a direct link from tertiary to secondary, and from secondary to primary. A primary category has no parent category. Also, a secondary category may contain no tertiary categories (it has no child tertiary categories). Those tertiary category records simply will not exist if they are not required. Figure 9-21 shows a developing star schema for the online auction company data warehouse database model. All the dimensions (static information containers) surround the facts (transactional information) in the form of a star schema. Seller Category Hierarchy Time Location Buyer Product Listing Bids Listing - Bids Buyer History Seller History History 245 Planning and Preparation Through Analysis
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