Database slow; How to check the Oracle query timings

Hi,
I have a quick question regarding a troubleshooting iam currently working on.
We have a J2EE application runnig on WLS 81 SP3.
We are experiencing a problem where the customer response time on our application is "too slow". We checked our N/W and they seems to be OK. The Iplanet webserver and BEA application servers looks good but on the Oracle database box - i saw "iowait" (when doing top UNIX command) to be 50-60 % which is extremly high. We are suspecting this to be our issue as the "iowait" is very high at the DATABASE box hence causing BEA servers to show "slow response" on certain pages which are database accentric.
Now, in order to proove that the queries are taking "too longer" to execute from the time BEA server requested and it actually got the reply back from database, i need to dig down and get some "profiling" (due to some political reasons, i can request to turn on profling at the moment) done. So, is there any way i can verify the response time when the BEA server requested some information from the database and the time when Oracle database responded with all the information requested ?
thanks for your help,

Yes. Create a Date object prior to the database call. Then create another one when the call completes. Convert both to mililseconds and subtract. You will have network latency in that statistic, but especially if you are using connection pools, the vast majority should be database access.
Another option is to turn on tk_prof or create an EXPLAIN plan table in Oracle. That will show the 'cost' of each query. Also, try running statistics on the database, that should help the optimizer.
- Saish

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