How to run a job in a given window of time

Hi All,
In an Oracle DB how do we schedule a job for a selective time period.
Say, to start a job at 8:00 AM, run it for 4 hours, and then stop at 5:00 PM and run it 5 days a week.
Whats the best practice, to use DBMS_JOB or Unix cronjobs ?
Regards,
Gaurav

The answer is highly version-dependant, what is your version. Oracle 10G introduces the scheduler, which is much more configurable than what was previously available (dbms_job). With respect to stopping the job after a certain duration, the best place to do this is probably in the code itself, if it's an in-house program unit. For one of our jobs, I send the maximum running time as a parameter, and then I make a check on the elapsed time periodically in the code. I then stop it gracefully when time is up. This is easily implemented with dbms_utility.get_time.
Daniel

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