How to calculate SELECT time

I want to know how to calculate time taken by SELECT query.
For example: I am running one select statement in TOAD(oracle version 9i) which takes 40 seconds to run but in output window it display few records. It says "showing 1 of 500 records, more records exist". That table has total 20 million records.
Now my question is: Did my SELECT query took 40 seconds? or it took 40 seconds to SELECT 500 records.
If it took 40 seconds to SELECT 500 records then how to calculate total amount?
Any help would be very much appreciated.

Where I will find trace file?
Toon Koppelaars wrote:
What you could do is this.
Say your current query is Q1. Then instead of executing Q1 in toad execute this in Toad:
select count(*)
from (Q1)
/This is not totally safe, since the CBO could decide to alter the execution plan given that you now are not interested in any of the columns you had in the SELECT list of Q1.
Other alternative is to use sqlplus.
Set pages 0
alter session set sql_trace=true;
Run your Q1.
alter session set sql_trace=false;
Find the trace file, tkprof it, and see exactly what happened and how much time it took.
I'm assuming that timed_statistics is set to true in your instance.Edited by: user639946 on Dec 3, 2010 1:00 PM

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