A data mart (DM) is a specialized version of a data warehouse (DW).
Like data warehouses, data marts contain a snapshot of operational data that helps business people to strategize based on analyses of past trends and experiences.
The key difference is that the creation of a data mart is predicated on a specific, predefined need for a certain grouping and configuration of select data.
A data mart configuration emphasizes easy access to relevant information (Reference : Wiki).
Data Marts are designed to help manager make strategic decisions about their business.
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