Diff b/w aggretation and compresion?
any one give me the diff b/w aggretation and compresion?,in both sinero we aggregate data, and why rool up, after rool up again we do compresion , i dont under stand taht
Hi,
Aggregation:
An aggregate is a materialized, aggregated view of the data in an InfoCube. In an aggregate, the dataset of an InfoCube is saved redundantly and persistently in a consolidated form on the database. Aggregates allow quick access to InfoCube data during reporting.
http://help.sap.com/saphelp_nw70/helpdata/EN/26/4bc0417951d117e10000000a155106/frameset.htm
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. 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 can be eliminated by Compressing the cube.
http://help.sap.com/saphelp_nw70/helpdata/EN/ca/aa6437e7a4080ee10000009b38f842/frameset.htm
First you have to build the Aggregates and do the Compression.
If you do Compression first then what happens is that it deletes all the Requests and transfers records from F Table to E Table.
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