Job execution exceeds Job frequency

Hi,
We have setup DBMS_SCHEDULER Job that is supposed to run every 5 minutes.
During each execution, Complex SQL gets executed.
We found on some rare occassions, Complex SQL exceeds 5 minutes to execute.
Would like to know how Oracle Scheduler (10gR2) handles this scenario:
Let us say we started first execution at 10:00 and Complex SQL is still executing at
10:06. Have few questions:
1)
What would happen at 10:05. Will Oracle attempt to launch second instance of
that query (Frequency=5 minutes) or would it not spawn second instance since
the Job started at 10:00 is still running?
2)
Is there any possible way (or syntax) to instruct Oracle not to start second instance
when one is already running.
Any help or suggestion would be appreciated.
We are looking at improving SQL Performance, however would like to maintain Job Frequency
at 5 minutes
Thanks
user641521

I know this type of question has been asked/answered in the last year on this forum but I can't find it right now. The quick answer is
1) Oracle (by default) will not start a second instance of the Scheduler item if it is still running at 10:05. Oracle will wait for the 10:00 instance to finish before it runs the job that was scheduled at 10:05. It will wait up until 10:10 when it will then try to run the instance that is scheduled for 10:10. So this means your first instance could start at 10:00 and finish at 10:08 and then Oracle will start running the 10:05 instance at 10:08. You can limit this using the Scheduler attribute of schedule_limit. The lowest allowed value for this is 1 minute so you can set it and tell Oracle that after 1 minute of waiting on the 10:05 instance to run, give up on it and wait for the next scheduled occurrence (in your case 10:10)
2) See answer to #1.

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