There are four different kinds of stages that are required in data warehousing and they are:

Offline Operational Databases: This is the top most and initial stage that allows the database to be viewed offline without going to online. This copy the database to the operational system and an offline server that processes the load of the online and offline and allow the performance to be balanced.

Offline Data Warehouse: This is the second stage where the updation of the time cycle that is regular takes place. The settings are given through which the data can be set like daily, weekly, monthly and yearly. This data is taken from the operational system. The data is stored in the report oriented data structure.

Real Time Data Warehouse: This allows the transaction update on the event basis. It means on an event an updation occurs. The transaction is performed in the operational system as well.

Integrated Data Warehouse: This is the final stage and it is used to generate activity or transactions. After generation they are again put back to the operational system to be used by the user on the daily basis