Log
    Log=file-spec
    Nolog

    Specifies how the statistics inserted into the RDB$WORKLOAD
    system table are to be logged. Specify the Log qualifier to have
    the information displayed to SYS$OUTPUT. Specify the Log=file-
    spec qualifier to have the information written to a file. Specify
    the Nolog qualifier to prevent display of the information. If you
    do not specify any of variation of the Log qualifier, the default
    is the current setting of the DCL verify switch. (The DCL SET
    VERIFY command controls the DCL verify switch.)