Less sql query cost ... but more time to fetch the records...

Question

Hi,
I faced up to a 'peculiar' situation with a costly db view.
I attempted to reduce the total view cost
specifically for 223 records fetched{the cost from 149 reduced to 74,
                                                       the recursive calls from 796 reduced to 224,
                                                       the consistent gets from 311516 reduced to 310341,
                                                        the physical reads from 7 reduced to 0}
but the amount of time needed to fetch the results is greater than the old version of the db view....{it may be the double...}
Have you any idea about this...????
Note: I have got fresh statistics...
         I use db 10g v.2
Thanks,
Sim

Answer 1

Try tracing the query and see what tkprofs shows you.
alter session set events '10046 trace name context forever, level 12';
run the query
alter session set events '10046 trace name context off';
Then run tkprofs on the trace file produced to see where the database is spending its time/effort. Do likewise for the baseline query in a different session (so you will generate a different trace file).
If that does not produce anything useful, try using
alter session set events '10053 trace name context forever';
run the query
alter session set events '10053 trace name context off';
Then examine the trace file to see if you can learn anything.
Since you have not given us anything more to go on, that is about all the help I can give....