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Data Mart

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What is a data mart?

A data mart is best regarded as a subset of a data warehouse. Oftentimes its use is oriented towards one specific business unit. They are useful to store summarized data, easily accessible to business users within that specific business unit.

A data mart has several benefits:

  • Faster response time due to the lower volume of data.
  • Provides access to often requested aggregated statistics.
  • There should only be one subject matter expert, drastically reducing organizational complexity.

There are some drawbacks, however. The main one is that the maintenance of a multitude of data marts can be cumbersome and time-consuming.

Both IBM and Talend have a good introductory piece on data marts, here and here.