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Data mart

Updated: Jul 1, 2020

What is data mart ?

A data mart (DM) can be seen as a small data warehouse, covering a certain subject area and offering more detailed information about the market (or department) in question..

A data mart can be created in two ways:

  • Capturing data directly from transnational systems, each data mart is seeking the relevant information for its market;

  • Capturing data from all transnational systems in a central data warehouse, which in turn feed all data marts.

The first option will provide a faster data mart, but without considering the cross-information between the other subject areas. The second option tends to be more efficient, but it will require more time to deliver results.

A top-down perspective considers that a full, centralized DW should be developed before parts of it, summarized, can be derived in the form of Data Marts. On the other side, a bottom-up perspective considers that a DW can be composed from previously developed data marts.

Difference between Data warehouse and Data mart:

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