How do data warehouses get their data?

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Data warehouses are designed for quick access to large amounts of historical data. Read operations dominate over write operations. Under these conditions, normalization takes a back seat to...

historic and current internal data

Not a lot really. They are just different names for the same thing. Some might argue that a data centre would house IT equipment that process data so would have a lot of servers. A data warehouse...

There are four key characteristics which separate the data warehouse from other major operational systems: Subject Orientation: Data organized by subject Integration: Consistency of defining...