Want to understand SID concept...

Hello experts,
why not using the value like e. g. customer number directly in the dimension table instead of a SID? So I also could save one table (SID table) and with this on JOIN by linking directly to the master data tables (text, attributes, hierarchies) using customer no. as key.
Am I wrong? Is it only because of this INT4 thing with the SIDs whitch maybe results in better performance?
What I maybe understand is compounding, it seems to be hard to make here a connection to the right master data table. But if I wouldn't have this case, why else could be this SID useful?
Best regards,
Peter

Hello Siggi,
thank you for your answer and the linke you provided. I think star schema concept and using surrogate ID's for dimension tables is absolute clear for me and I see the advantage there.
How I said, faster DB access using INT4 values instead of characters is also a point I understand. On the other side SAP BW offers you to use a line item dimension which saves a join and result in a better performance.
But why not give the BW developers the chance to decide if you want use it? If your InfoObject is a numeric one, you are may be much faster, saving a join and having an even easier to handle value.
What I am interested in is, if SID technology is so deeply part of SAP BW, for example if you want to report on an DSO you also need SID's, what is the real advantage usind SID's every time for access of InfoCube or DSO data?
See, i read for example the following advantages of BW star schema on [this site|http://learnmysap.com/sap-bw/138-classic-and-sap-bw-star-schema-comparisons.html]:
-> Faster access to data than via long alpha-numeric keys. SAP BW use automatically generated INT4 keys for SID and Dimension ID
-> Can model in easy way: Historizing, multi-lingual, and shared dimensions. It is happen because of the excavation of master data from the dimension tables using the SID technique.
-> The query performance is improved here as aggregated key figures can be stored in their own fact tables.
OK, first point about INT4-keys we discussed.
I completly don't understand the second point and why therefore SID's are needed.
Third point depends on disadvantages of the classical star schema compared to bw aggregates, a point I understand
Often I read: The SID table provides the link between the master data and the dimension tables. (like here: /people/githen.ronney3/blog/2008/02/13/modeling-strategies)
But why shouldn't this be possible just with the key value?
Even SAP just describes his enhanced star schema without SID's, but technically SID's are used. Why not use it like SAP itself describes here:
http://help.sap.com/saphelp_nw70ehp1/helpdata/en/4c/89dc37c7f2d67ae10000009b38f889/content.htm
regards,
Peter

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>>
However, for those who do develop applications,you
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