Beginner in sap  biw

hai friends,
wright now i am working in abap.
but in my company i think they going to implement biw so pls
send me good notes for biw and bi notes. so that i can switch over to biw.
then i read hendry foo step by step material,
i got lot of doubts,
what is fact table? what it will hold?
what is  dimension table?
what are master sid text and hirerachies?
so  pls answer my questions,
1. what is star schema?
2. what is extended star schema?
3. what is fact table?
4. what is dimension table?etc?
5. what is info source,source system,psa,ods and infocube.?
6. what are the difference between biw and bi?

Hi,
You should read Multi-Dimensional Modeling with BW then you will find your all answer there.
http://help.sap.com/bp_biv170/documentation/Multi-dimensional_modeling_EN.doc
Regards.

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