Why we are using SID in DSO when there we are using star schema in BI

can anyone answer me why we are using SID in DSO also, i mean what is the need of SID in DSO?

The reason basically is that the entire query api in BW is based on SIDs
If you look at a sql of a query that is generated when you run a report you can see this
Example..
If you put a selection of period = 02.2009
In the SQL you will not see "where period = 02.2009" you will see "where sid.period = '000100001010" or something like that
The whole query  is like this for Infoproviders of DSOs and Infocubes
Yes it is annoying - but that't  the way it is..
So if you have a DSO you wish to report on you need the SID for the SQL to fire..!
On an operational daya to day side - if my cubes are 1:1 granularity with my DSOs then I prefer to put SID activation on the DSOs - two reasons
1. so the cube load is quicker because the SID generation has already taken place (is this important? never sure but I always do it)
2. future use of the DSO as a reporting object (this was before the days of the operational store as part of a LSA structure)

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