The Oracle RMU Monitor controls the Oracle Rdb Monitor Process.
    An Oracle Rdb Monitor Process must be running on each system on
    which you use Oracle Rdb, including each node in a VAXcluster
    or VMScluster. An RMU Monitor command controls only the monitor
    process running on the system from which the command is issued.

    The Oracle Rdb Monitor Process controls all database access and
    initiates the automatic recovery procedure when necessary.