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
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
Provides integrated view, uniform user interface
Supports sharing
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