Interview question being asked

Hi All,
I was asked interview techinical question. I was not able to answer these. can anyone tell me what are the answers for these!
Q How do you convert Basic cubes to Transactional Cubes?
Q Diffrence between version Bw3.5 with other older version like BW 3.0, 2.1
Q what is Rollup, why we use it? (i Answered this one but not staisfactory accrding to the interviewer)
Ans To apply newly loaded data to aggregates you use rollup. You can maitain aggreegates in rollup.
He said but what it is ?
Thanks
Gaurav

Gaurav
Check these links also
http://sap.ittoolbox.com/documents/document.asp?i=3240
http://www.techinterviews.com/?p=198.
http://www.fundoosite.com/interview-questions/type.asp?iType=72
http://www.sapassist.com/documents/document.asp?i=3240
http://www.sap-img.com/abap/more-than-100-abap-interview-faqs.htm.
Thnaks
Sat

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