Optimal Value for job_queue_processes

Question:  I have jobs that fail to run, and I wonder if my setting for job_queue_processes is too low?  

How can I tell when my job_queue_processes parameter is optimized?

Answer:  The job_queue_processes is the number of concurrent jobs running, which your DBA should know from their daily job stream.  The easy way to set job_queue_processes is to set it to a reasonable value such as five, since only very busy batch system will have n=more than five concurrently executing batch jobs.  

If job_queue_processes is too low, jobs may be seen waiting in the execution queue for a process to become free.  You can also monitor the job queue and set job_queue_processes to the high water mark of executing jobs.  You can write a monitor to track the maximum count from dba_jobs_running to find the optimal value for job_queue_processes.  

The book "Oracle Job Scheduling" addresses the optimization of job_queue_processes in detail.

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