How to find sql statement which generates LOCK

Hello,
In my plsql procedure i have used SELECT FOR UPDATE NO WAIT statement to avoid the current record used by another user.
Actually i want to find which sqlquery is locking the Object other than my procedure.
I can find the session id which is locking the object but i can not able to find sql text.
How to find the SQL text from particular LOCKING Session id as v$sql or v$sqltext or v$sqlarea dont have session id?
Any help can be appreciated.
Thanks in advance.

It's not necessarily that easy to find the statement that was responsible for the lock.
It depends.
First of all, it depends on version.
If you're >= 10g and you're lucky and you're licensed for Diagnostic Pack, you might find it in ASH.
If the statement that's responsible for the lock is also waiting on something else or runs for long enough, then ASH will almost certainly have it.
Doug Burns has a 10-part series on the subject.
http://oracledoug.com/serendipity/index.php?/archives/1477-Diagnosing-Locking-Problems-using-ASH-Part-1.html

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