Why Data warehouse?

Why do we need a data warehouse?

Heterogeneities are everywhere

Enterprises tend to rely on different databases, files, external sources and even the internet and social media for all the information. This means:

Different interfaces
Different data representations
Duplicate and inconsistent information

Data Management in Large Enterprises
Vertical fragmentation of informational systems (vertical stove pipes)
Result of application (user)-driven development of operational systems

The goal of building a warehouse is to have a system that:
Collects and combines information
Provides integrated view, uniform user interface
Supports sharing

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