Bill Inmon and Ralph Kimball are the two pioneers that stated different philosophies in enterprise-wide information gathering, information management, and analytics for decision support. They have formed a great debate about data warehousing. They approach the problem with different viewpoints, design techniques, and implementation strategies. Inmon suggests creating a single enterprise by data warehouse for producing an overall business intelligence system. Kimbal suggests creating several small data marts for producing department level analysis and reporting.

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