High Load on Concurrent Processing node

Question

Hello :
version :11.5.10.CU2 / Linux -86
Recently I have started to notice that my concurrent processing node is loaded heavily between 3.00 AM to 6.00 AM and the load is normal. I need to find out the root cause of this spike. Is there a log that I can look for in concurrent processing node that will give me a clue.
Regards,
Bala

Answer 1

Look at the longest running requests during that time, then enable sql trace so you can start to tune them, or work with Oracle Support if they are standard programs running with suboptimal execution plans.
SELECT CR.REQUEST_ID "Request", U.USER_NAME "User", CP.USER_CONCURRENT_PROGRAM_NAME "Program",
TO_CHAR(CR.REQUESTED_START_DATE,'DD-MON-YY HH24:MI:SS') "Requested Start",
TO_CHAR(CR.ACTUAL_START_DATE,'DD-MON-YY HH24:MI:SS') "Actual Start",
ROUND((CR.ACTUAL_COMPLETION_DATE-ACTUAL_START_DATE)*24*60*60,0) "Duration (sec)",
ROUND((CR.ACTUAL_COMPLETION_DATE-ACTUAL_START_DATE)*24*60,2) "Duration (min)",
CR.PHASE_CODE "Phase", CR.STATUS_CODE "Status", CR.ARGUMENT_TEXT "Arguments"
FROM FND_CONCURRENT_REQUESTS CR,
FND_USER U,
FND_CONCURRENT_PROGRAMS_TL CP,
FND_RESPONSIBILITY_TL R
WHERE CR.REQUESTED_BY = U.USER_ID
AND CR.PROGRAM_APPLICATION_ID = CP.APPLICATION_ID
AND CR.CONCURRENT_PROGRAM_ID = CP.CONCURRENT_PROGRAM_ID
AND CP.LANGUAGE='US'
AND CR.RESPONSIBILITY_APPLICATION_ID = R.APPLICATION_ID
AND CR.RESPONSIBILITY_ID = R.RESPONSIBILITY_ID AND R.LANGUAGE='US'
AND (TO_CHAR(CR.ACTUAL_START_DATE,'DD-MON-YYYY HH24:MI') BETWEEN '30-JUN-2011 03:00' and '30-JUN-2011 06:00')
ORDER BY ROUND((CR.ACTUAL_COMPLETION_DATE-ACTUAL_START_DATE)*24*60*60,0) DESC