Interview  Questions. Help me to get the answers

Hi,
The interview questions are,
1) Oracle installation under Unix and WindowsNT? Differences
2) Difference between UTLXPLP.SQL and UTLXPLS.SQL
3) If Database size is 1TB can the SGA size be 1024MB
4) Can we take logical backup? How
5) If we update a table in a schema or any SQL statements fetching datas from datafiles and user COMMITS after issuing the statement, what happens in background? Steps please
6) How the datas are fetched from datafiles to DB BufferCache? which process does it?
I told it is done by Oracle. Is it correct?
7) In TKPROF Output table it shows some datas like...
1) select cost 1500
2) nested loop cost 1500
hash join cost 5000
nested loop cost 1000
nested loop cost 2500
FULL TABLE SCAN
From the above output, how to determine which physical reads is very high, and what are the datas showing " cost nnnn" ?
Thanks in Advance
Rajkumar.K

1/ Windows: Hit next, next, next, next, next, next, next (maybe did I forgot 1 or 2 nexts :p )
   Unix: You must use your brain
2/ UTLXPLP.sql : Parallel
   UTLXPLS.sql : Serial
3/ Yes. But you're going to have some horrible perf.
4/ Yes, with export (not recommended backup way). You can event create spool files.
5/ RTFM. Way to long to type.
6/ USP does it. How? Find space in DBC.pool, I/O from Disk to memory
7/ There is no way to determine the physical reads from this output. Don't mind the FTS, all the table data can be in memory (Keep pool for example, or CACHE table). COST is the optimized estimated step weight.
Rajkumar, you should follow answer from step 5. It's all there.
Regards,
Yoann.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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