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Much of the conversation about what constitutes a data warehouse has been driven by two influential thought leaders Bill Inmon and Ralph Kimball who have

Much of the conversation about what constitutes a data warehouse has been driven by two influential thought leaders Bill Inmon and Ralph Kimball who have different approaches to modeling and developing warehouses. Inmon defines a data warehouse as a subject-oriented, integrated, time-variant and non-volatile collection of data in support of managements decision-making process.64 A normalized relational model is used to store and manage data. Kimball defines a warehouse as a copy of transaction data specifically structured for query and analysis. Kimballs approach calls for a dimensional model.

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