OtterTune supports tuning both dynamic knobs and static knobs. With a dynamic knob, OtterTune can change its value in the database and have it take effect without restarting the database first. Static knobs, on the other hand, do require a database restart. This setting allows you to control whether OtterTune is allowed to restart the database when it is in the "Optimizing" tuning mode. If the restart setting is disabled, then OtterTune will not attempt to modify configuration knobs that require restarting.