data mart (datamart)

This definition is part of our Essential Guide: Cloud data warehouse guide: Using Redshift, rival platforms
Contributor(s): Dan Gallagher, Tim D. Nelson, and Steve Proctor

A data mart is a repository of data that is designed to serve a particular community of knowledge workers.

The difference between a data warehouse and a data mart can be confusing because the two terms are sometimes used incorrectly as synonyms. A data warehouse is a central repository for all an organization's data. The goal of a data mart, however, is to meet the particular demands of a specific group of users within the organization, such as human resource management (HRM). Generally, an organization's data marts are subsets of the organization's data warehouse.

Because data marts are optimized to look at data in a unique way, the design process tends to start with an analysis of user needs. In contrast, a data warehouse's design process tends to start with an analysis of what data already exists and how it can be collected and managed in such a way that it can be used later on. A data warehouse tends to be a strategic but somewhat unfinished concept; a data mart tends to be tactical and aimed at meeting an immediate need.

Today, data virtualization software can be used to create virtual data marts, pulling data from disparate sources and combining it with other data as necessary to meet the needs of specific business users. A virtual data mart provides knowledge workers with access to the data they need while preventing data silos and giving the organization's data management team a level of control over the organization's data throughout its lifecycle.

See also: knowledge warehouse, spreadmart, master data management, data lifecycle management, data curation, data stewardship

This was last updated in May 2014

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Good definition of data mart.
The "data virtualization" link actually points at the definition for "data visualization"
Can anyone explain what is actuarial data mart?



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