None of the jobs scheduled in 'Scheduler Jobs' are running. Even when ran manually also, nothing happens. Everything went fine till the previous night. GRID doesn't show any error why those jobs failed, due to what reason. The jobs are scheduled and enabled.
Did you check Jnnn processes.
Maximum number is limited by the JOB_QUEUE_PROCESSES instance parameter, which can have any value from
zero (the default) to a thousand . If set to zero, the Scheduler will not function.