In computing, data warehousing, is often a system used for reporting and info analysis. Data Warehousing are generally central repositories involving integrated data from several disparate sources. They store existing and historical data and they are used for creating trending reports for senior management reporting like annual and quarterly comparisons. Data warehousing includes a collection of important, new concepts and tools which have evolved into any technology. This makes it possible to counter the problems involved with providing all the real key information, to the particular concerned people.