What is DataWarehouse?

A data warehouse is a central integrated database containing data from all the operational sources and archive systems in an organization. It contains a copy of transaction data specifically structured for query analysis. This database can be accessed by all users, ensuring that each group in an organization is accessing valuable, stable data
Data Warehouse
A Data Warehouse Is A Structured Repository of Historic Data.
It Is Developed in an Evolutionary Process by Integrating Data from Non-integrated Legacy Systems.
It Is Usually:
ü    Subject Oriented
ü    Integrated
ü    Time Variant
ü    Non-volatile

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