i tryed to change the number of Job_Queue_Processes. When i use the command ALTER SYSTEM SET JOB_QUEUE_PROCESSES=20 .. the answer i get is 2 in the next line of the shell.
Have i go to a special directory to use this command or knew someone that problem.
The command to show the value of Job_Queue_processes is working correctly
you're posting the the wrong forum ( this is APEX, you probably are using XE ). But anyway, set a semicolon at the end of the line so SQL knows the statement is ended.
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=20;