Dataware House: A data warehouse is a subject-oriented, integrated, time-variant and non-volatile collection of data in support of management's decision making process. In computing, a data warehouse (DW or DWH), also known as an enterprise data warehouse (EDW), is a system used for reporting and data analysis, and is considered a core component of business intelligence. DWs are central repositories of integrated data from one or more disparate sources. A data warehouse is constructed by integrating data from multiple heterogeneous sources that support analytical reporting, structured and/or ad hoc queries, and decision making. Data warehousing involves data cleaning, data integration, and data consolidations. The key characteristics of a data warehouse are as follows: Some data is de-normalized for simplification and to improve performance. Large amounts of historical data are use...