A suggestion about statspack...

Hi ,
I need a suggestion in statspack and sql tuning/db performance when an application runs......
Imagine that I run some forms/reports e.t.c. developed with Developer Suite 10.2 , say form1 , form2 , form3 , form4 .... form15 in a time of 10 minutes...
Next examining the statpack report , i try to alter a db parameter let's say DB_CACHE_SIZE ......
Should I run exactly the same forms (form1 , form2 , form3 , form4 .... form15) in about 10 minutes and compare the two statspack report... or should I run other forms in the same (or about the same) amount of time?????
Something else.... Which is best of the following.. to alter one - by - one db parameter and compare the new statspack report to the older or alter two,three... db parameters at once and compare the new statspack report to the older....one.
Thanks , a lot
Simon

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