Data Warehouse is a "Subject-Oriented, Integrated, Time-Variant Nonvolatile collection of data in support of decision making". In terms of design data warehouse and data mart are almost the same.
In general a Data Warehouse is used on an enterprise level and a Data Marts is used on a business division/department level.
Subject Oriented:
Data that gives information about a particular subject instead of about a company's ongoing operations.
Integrated:
Data that is gathered into the data warehouse from a variety of sources and merged into a coherent whole.
Time-variant:
All data in the data warehouse is identified with a particular time period.
Non-volatile:
Data is stable in a data warehouse. More data is added but data is never removed.
No comments:
Post a Comment