Wednesday, September 26, 2007


Data Warehouse

Data warehouse is a collection of historical data as well as current data.

Data warehouse is defined with the help of subject-oriented, time-variant, non-volatile and integrated data.

The data in the database is organized so that all the data elements relating to the same real-world event or object are linked together;
The changes to the data in the database are tracked and recorded so that reports can be produced showing changes over time;
Data in the database is never over-written or deleted - once committed, the data is static, read-only, but retained for future reporting; and
The database contains data from most or all of an organization's operational applications, and that this data is made consistent.

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