The Update method doesn't update properties—that is done by the RGM. Rather, it notifies running processes that an update has occurred. The only process in the sample data service affected by a property update is the fault monitor, so it is this process the Update method stops and restarts.
The Update method must verify the fault monitor is running and then kill it using pmfadm. The method obtains the location of the probe program that implements the fault monitor, then restarts it using pmfadm again.