Can someone take some time to answer these interview Qs?

Hi BW Experts,
1)how many internal tables are there?(or may be internal table types)
2)in ODS settings there is a setting for BEX flag.  what exactly happens behind the scenes when we set that flag?
3)how to improve performance on <b>data loading</b>(not on query)
Thanks in advance,
Sam

Hi Samay,
  I dont know abt the internal tables but for other 2 queries i can give answers for best of my knowledge..
2a) After setting Bex reporting flag on the ods objects creates sid tables so it degrades reporting performance so that we always use infoset query to report on ods..
3a) Data loading performance can be improved by
1)disabling indices
  2)PSA partitioning on required datapacket size
3)Line Item dimensions as there will be no dim table between fact table and sid table ..
Hope it helps you..

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