Job running, when will the next scheduled one start?

Hi all,
When I schedule a job every 3 minutes and the previous one has not finished, when will the next run start?
Is it immidiatly after the previous run ends? Or at a given time? (f.e.: 6.30 -> run 6.33 -> skiped because the 6.30 job is still running 6.36 -> last job has stopped so it's oké to start this one) Or at the initial 3 minute interval counting since the last job ended? (f.e.: 6.30 -> run, job ends at 6.34, next job at 6.37)
Thanx...

I know this has been answered better somewhere in this forum but I can't find it right now so here is a quick answer to your questions.
Assumption: You have set the scheduler to run a job every 3 minutes starting at 6:30 today.
The scheduler uses that information to determine that the job should run at 6:30, 6:33, 6:36, 6:39, etc. The Scheduler will only have one running occurrence of your job so you do not have to worry about it running concurrently. If the first run at 6:30 takes 4 minutes, when it finishes at 6:34, the Scheduler will immediately start up the 6:33 scheduled job and have it run. If instead, the first run at 6:30 takes 7 minutes, the Scheduler will skip the 6:33 run and run the 6:36 schedule instead.
You can also say that if a job is "x" time units late, do not run it. This can be done via the schedule_limit attribute, set via DBMS_SCHEDULER.SET_ATTRIBUTE. For the example, you could set it to 2 minutes and if the first run takes 5 minutes, the 6:33 run will be skipped and the Scheduler will wait till 6:36 to run the next occurrence.

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