Aggregation and Fragmentation

Hi Gurus,
what is meant by aggregation and fragmentation in OBIEE .Do we use these only when we want to improve the performance of the report if no in which type of scenarios when will go for these.Please any one help me with exact scenario.
Regards,
Rafi

Hi,
As per the below link
http://108obiee.blogspot.com/2009/01/fragmentation-in-obiee.html
In fragmentation after fragmenting the table in database and reimporting the tables and making the joins in Physical layer. we have to drag the table in BMM layer .
When we generating the report on channels table with channel id greater than 5 then how the biserver will go to the particular table(i.e.Channels_Other). How the biserver will follow the link between two tables(i.e. CHENNELS and CHENNELS_OTHERS) when fetching the data in the report.
In logical table source why we have to enable the option This source should be combined with other source at this level if we won’t enable this option what it will happens.
Thanks,
Edited by: Rafi.B on Aug 2, 2012 1:06 AM

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