Output=file-name

    Specifies the device, directory, and file name that receives the
    monitor log. You can use this qualifier to redirect the placement
    of your monitor log file. The default device and directory is the
    SYS$SYSTEM directory. The default log file name is RDMMON.LOG.
    The RMU Monitor Start command causes a new version of the log
    file to be created for each database session.