* Data warehouse is a repository for information,
It integrate data and gives broader access to different kind of data user from many different management level/division.
* Data warehouse guarantee integrity and quality of data.
This integrity is important since data warehouse is designed to provides a historical perspective/views.
* Data warehouse designed to reduce reporting and analysis process in main operational system.
Operational system is dedicated to support daily business process.
* Data warehouse is to serve backoffice and management reporting and analysis requirement, and decision suppport system if any.
This last feature make data warehouse requires a major system integration effort.
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