Why are data in a data warehouse stored in unnormalized tables?
Normalizing data in an operational database is necessary to reflect accurately the dynamic interactions among entities. While a fully normalized database provides the flexible model needed for supporting multiple users in operations environment, it also adds to complexity that translate into performance inefficiency. Because of the vast size of a data warehouse, such inefficiency can be devastating. A three-way join between tables in a large data warehouse may take an unacceptably long time to complete and may be unnecessary. In the data warehouse model, the relationship among attributes does not change. Because historical data are static in nature, nothing is gained by constructing normalized tables with dynamic links.
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