A data warehouse is used to contain (Michigan web site) archived
A data warehouse is used to contain archived information, separated from the OLTP database, thus not causing performance problems with the OLTP database. Establishing Company Operations Company operations have already been established when analyzing the database model for the OLTP database structure. All that needs to be done for a data warehouse database model is to establish what are the facts (transactional information), and what are the dimensions (static data). This can be done in a number of stages, as shown in Figure 9-20, Figure 9-21, and Figure 9-22. Figure 9-20: Data warehouse data modeling denormalizes multiple hierarchical static tables into single static structures. Figure 9-21: A data warehouse star schema database model for the online auction house. Seller Category Hierarchy Time Location Buyer Product Facts All the dynamic information (the facts) Locations, times (dates) and products are common to many data warehouse database models Primary Category Secondary Category Tertiary Category Category Hierarchy 244 Chapter 9
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