Data Warehousing:
The term data warehouse was coined by Bill Inmon, who is called as the father of data warehouse in 1990. According to him, "A warehouse is a subject-oriented, time-variant, integrated and non-volatile collection of data in support of management's decision making process.
Data warehouse architecture represents the overall structure of data and has three components, namely, data source, data loaders and DBMS, and query and analysis tools. Data is entered into the DBMS with the help of data loaders and the desired data is extracted from the DBMS with the query and analysis tools. Data warehousing involves a number of techniques such as data cleansing (validating and correcting the data before inserting it into the warehouse), data mining and business intelligence, and metadata management. Metadata is referred to as ‘data about data'. Metadata management helps companies to make an analysis of the impact of changes to database tables and track the owners of individual data elements; metadata management also helps in building the data warehouse.
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