Data warehousing (DW) is a method for collecting and managing information from varied sources to produce purposeful business insights. The data warehouse is often accustomed to connect and analyze business data from heterogeneous sources and forms the core of the metal BI system that is made for data analysis and reports.
Data Warehousing provides us with large benefits :
1) Better Decision Making
2) Quick Data Access
3) Data Quality and Consistency
Properties of Data warehouse:
1) Subject-Oriented: Data is categorized and stored by business subject rather than by application
2) Integrated: Data on a given subject is collected from disparate sources and stored in single pieces
3) Time-Variant: Data is stored as a series of snapshots, each representing a period of time
4) Non-Volatile: Typically data in the data warehouse is not updated or deleted
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