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Learn Data Warehouse from best Institutes in Nanded. Data warehousing is a relational or multidimensional database management system designed to support management decision making and it is a technique for assembling and managing data from various sources for the purpose of answering business questions. Thus making decisions that were not previous possible. It is a copy of transaction data specifically structured for querying and reporting.

They are central repositories of integrated data from one or more disparate sources. They store current and historical data in one single place and are used for creating analytical reports for knowledge workers throughout the enterprise. The data stored in the warehouse is uploaded from the operational systems (such as marketing or sales). The data may pass through an operational data store and may require data cleansing[2] for additional operations to ensure data quality before it is used in the DW for reporting.

The typical Extract, transform, load (ETL)-based data warehouse uses staging, data integration, and access layers to house its key functions. A data mart is a simple form of a data warehouse that is focused on a single subject (or functional area), hence they draw data from a limited number of sources such as sales, finance or marketing. Types of data marts include dependent, independent, and hybrid data marts.
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