Data Marts is used on a business division/department level.

A data mart only contains the required subject specific

data for local analysis.

A database, or collection of databases, designed to help

managers make strategic decisions about their business.

data marts are usually smaller and focus on a particular

subject or department. Some data marts, called dependent

data marts, are subsets of larger data warehouses. A data

mart is a simpler form of a data warehouse focused on a

single subject (or functional area) such as sales, finance,

marketing, HR etc. Data Mart represents data from single

business process.

Data mart is a subject oriented data base which support the business requirement of the indivisual business department.Data mart is a sub set of the Dataware house.Since it improves the perfomance of the Dataware house,it also known as High Performance Query Structure(HPQS).

Subject means Business of Interest like HR,Finance,Sales department etc