I came across this posting on OTN which lists down things to check in case your scheduler job is not . This is quite old and many of you would have already seen it. But for others and also for my future reference I am mentioning it here
http://forums.oracle.com/forums/thread.jspa?threadID=646581
Aman....
There is another thread by the same guy Ravi,
http://forums.oracle.com/forums/thread.jspa?messageID=2304463�
This is about external jobs. Very nice!
Aman….
Amit
Thanks Aman. Yes above link is also very informative..
Regards
Amit