A Data Warehouse is a collection of an organization’s historical data especially used for reporting and analysis purpose. By William Inmon A data warehouse have following characteristics.
Subject oriented: Data Warehouse is designed to help analyze different department of business.
Integrated: A data warehouse integrates data from multiple data sources.
Nonvolatile: Nonvolatile means that, once entered into the warehouse, data should not change.
Time Variant: Historical data is available in a data warehouse.
Data Warehousing is architecture for collecting, storing and delivering data in data warehouse for an organization.
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