The Oracle Enterprise Manager
enables you to centralize your DBA monitoring and create pre-defined corrective actions. Because the work is
done by the Intelligent Agents on the remote servers, the corrective actions are local.
This is an important point.
You do not want a lost network connection to interfere with the monitoring and corrective processing.
The OEM Event Manager
allows for the definition of an almost infinite number of Oracle thresholds
as illustrated below.