What is difference betwwen aggregates and compression in bi 7.0.

hi All,
will you please tell me difference between compression and aggregates in bi.

Dear Ganesh,
        Aggregates allow you to improve the performance of BI queries when data is read from an InfoCube. The data of a BI InfoCube is saved in relational aggregates in an aggregated form. Relational aggregates are useful if you want to improve the performance of one or more specific BI queries, or specifically improve the performance of reporting on characteristic hierarchies
       Compression is phenomenon where all the contents of ur info cube moves from F to E table,,This is called compression and data will be aggregated when this compression happens..
Why do we do compression..??
When you load data into the InfoCube, entire requests can be added at the same time. Each of these requests has its own request ID, which is included in the fact table in the package dimension. This makes it possible to pay particular attention to individual requests. One advantage of the request ID concept is that you can subsequently delete complete requests from the InfoCube.
However, the request ID concept can also cause the same data record (where all characteristics are the same except the request ID) to appear more than once in the fact table. This unnecessarily increases the volume of data and affects system performance when you analyze data, since each time you execute a query, the system has to perform aggregation using the request ID.
You can eliminate these disadvantages by compressing data and bringing data from different requests together into one single request (request ID 0).
For more info on aggregates
http://help.sap.com/search/highlightContent.jsp
and info on Compression
http://help.sap.com/search/highlightContent.jsp
Hope this helps u...
Best Regards,
VVenkat..

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