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Monday, 6 March 2017

Definition of a Data Warehouse


By on 04:00:00

A data warehouse is a subject oriented, integrated, non-volatile, and time-variant collection of data to support management decisions

                                                                                          — Bill Inmon

Definition of a Data Warehouse

Subject-Oriented


Data is categorized and stored by business subject rather than by application.


Subject-Oriented


Integrated



Data on a given subject is collected from various sources and stored once.



Time-Variant

Time-Variant

Data is stored as a series of snapshots, each representing a period of time


 

Non-volatile


Typically data in the data warehouse is not updated or deleted.
 
Non-Volatile

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