When do we prefer Data Federator to be used

Dear SCNers,
I read some blogs and forums about Data Federator. I got information process of working with Federator . But I didnt get When do we go for Data Federator.Before creating any Universe first we do have to create the data source using this data federator. (is it Prefered Process) .
Even without a data federator also we can create or connect to data source and design a universe. So when do we go for this Data Federator?
Thanks,
Swathi.

Hi,
In the single  Data Federator project you can create multiple data source , merge data in the single target table ,create two DF projects ,drag tables from both DF Projects  in the single universe and can  join in the universe.
All things are dependent on the requirement and situation like you can merge data on DF level ,you can link universes in designer or you can merge data in the webi by creating multiple query.
Please go through the References and links tab in the below link.these will give the better idea how you can create DF project,universe.
http://wiki.sdn.sap.com/wiki/display/BOBJ/ImplementingDataFederatorNWBWConnectorforWebiReporting
Below link will give you the prons and cons  of creating DF project on top of SAP Cube.
http://wiki.sdn.sap.com/wiki/display/BOBJ/LeveragingDataFederatorinSAP+integrations
Thanks,
Amit

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