A database[2], or collection of databases, designed to help managers make strategic decisions about their business. Whereas a data warehouse[1] combines databases across an entire enterprise, data[3] 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.
The combining of many different databases across an entire enterprise. It is A collection of data designed to support management decision-making. Data warehouses contain a wide variety of data that present a coherent picture of business conditions at a single point in time. Development of a data warehouse includes development of systems to extract data from operating systems plus installation of a warehouse database system that provides managers flexible access to the data.
