Data warehouse provides architectures and tools for business executives to systematically organise understand and use their data to make strategic decisions. A data warehouse refers to a database that is maintained separately from an organisation's operational databases. Data warehouse systems allow for the integration of a variety of application systems.
- Subject-Oriented - A data warehouse focuses on the modeling and analysis of data for decision makers.
- Integrated - As the data warehouse is usually constructed by integrating multiple heterogeneous sources.
- Time-Variant - Data are stored to provide information from a historical perspective.
- Non-Volatile - A data warehouse is always a physically separate store of data transformed from the application data found in the operational environment.
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