A DDS is a database that stores the data warehouse data in a different format than OLTP.
The reason for getting the data from the source system into the DDS and then querying the DDS instead of querying the source system directly is that in a DDS the data is arranged in a dimensional format that is more suitable for analysis.
The second reason is because a DDS contains integrated data from several source systems.
and we can take risk of querying source systems... source systems may go down
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