Zeus web server - Figure 10-32 refines the database model with denormalization.
Figure 10-32 refines the database model with denormalization. All the nasty detailed Normal Forms are removed. The VENUE is retained since venues are static (dimensional) and shows are dynamic (fact data). Figure 10-32: Refining the database model with denormalization. Case Study: Refining a Data Warehouse Database Model Figure 10-12 shows the most recent version of the data warehouse database model for the online auction house. From an operational perspective, you identified categories, sellers, buyers, locations, times, and a large fact table. Where do you go from here? What you need to do is probably to normalize the fact table somewhat, into separate fact tables. Separate fact tables become separate star schemas, and thus separate data marts. Figure 10-33 shows an initial split of facts into three separate fact tables (see Figure 10-12). Instrument section_id (FK) instrument instrument_id Genre parent_id (FK) genre genre_id Musician instrument_id (FK) band_id (FK) musician phone email skills musician_id Band genre_id (FK) band founding_date band_id Discography band_id (FK) cd_name release_date price discography_id Merchandise band_id (FK) type price merchandise_id Venue location address directions phone venue_id Show venue_id (FK) band_id (FK) date time show_id Advertisement band_id (FK) musician_id (FK) ad_date ad_text advertisement_id 308 Chapter 10
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