What is a data Warehouse? Defined in many different ways non-rigorously A DB for decision support Maintained separately from an organizations operational database a data warehouse is a subjiect-oriented integrated time-variant, and nonvolatile collection of data in support of management's decision-making process.-- W.H. Inmon o Data warehousing The process of constructing and using data warehouses11 What is a Data Warehouse? • Defined in many different ways non-rigorously. – A DB for decision support. – Maintained separately from an organization’s operational database. • A data warehouse is a subject-oriented, integrated, time-variant, and nonvolatile collection of data in support of management’s decision-making process.— W. H. Inmon • Data warehousing: – The process of constructing and using data warehouses