I've created an Oracle discovery job, but the tasks never run.
The GatewayWrapper.log for the DFP does show the job loading, but it never starts.
The Probe Results log shows the results from the Infrastructure Discovery but nothing from Oracle.
Infrastructure jobs run fine.
What job are you trying to run? You can use first Host Resources and Application (SHELL) and then Oracle Database Connection by SQL
Have you checked the trigger query of the jobs?