Please post the details of the application release, database version and OS.
Any changes have been done recently (patches, upgrade, installation, ..etc)?
Concurrent Processing - How to Find Database Session & Process Associated with a Concurrent Program Which is Currently Running. [ID 735119.1]
How to Retrieve SID Information For a Running Request [ID 280391.1]
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Concurrent Processing - CCM.sql Diagnostic Script to Diagnose Common Concurrent Manager Issues [ID 171855.1]
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Also, search the forum for "Concurrent Manager" and "Tuning".
If the users who scheduled the concurrent requests are end-dated, then the concurrent managers will consume high cpu and memory. You can see the error and the concurrent request id in Concurrent Manager logs
Thanks for the Post. This post helped me to solve my production issue.
My production application started hanging suddenly and no clue why it is behaving like this.
The symptom was FNDLIBR processes were on top cpu consumer on application server.
The database server also experienced heavy system i/o and cpu usage.
The database base log switches every minutes (500 MB) and there are no concurrent requests running.
No concurrent request errors. No OS errors (Cleaned the GNOME and restarted). No database errors.
But in sql area i saw lot of fnd service requests keep coming.
At the end the application server hangs because of high cpu and it caused the production down.
The problem was one of Our System Administrator disabled one responsibility with scheduled request.
One interesting thing we noticed, even you put the request in question Hold, it will start running while you restart the concurrent request.
You have to cancel the concurrent request and restart the concurrent manager can solve the issue.