Why does the data warehouse need to be separate from the operational databases?
The conclusion that a data warehouse must be maintained separately from the operational database reflects several issues. The transaction processing system needs a data structure that supports performance. A normalized database aids users by adding complexity that can yield performance inefficiency. Data mining systems need an organization that permits broad queries. The data warehouse permits the integration of data still maintained in legacy systems. And the complexities of modern business can benefit from the ability to analyze data extensively in ways not permitted in traditional databases.
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