There are many functionalities BW itself provides, but BW also makes efficient use of the functionalities of databases, like Oracle. This makes it easier to manage and access historical data, irrespective of the volume.
Also, BW infoproviders like Infocubes and ODS help store data in different forms, from a summarized level to the most detailed level, which makes it possible to complete DSS complex queries or daily operational level reporting.
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