VMS Help SET, FILE, Qualifiers, /STATISTICS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /STATISTICS
       /NOSTATISTICS (default)

    Enables the gathering of RMS statistics on the specified file.
    These statistics can then be viewed by using the Monitor
    utility, which is invoked with the DCL command MONITOR. The
    SET FILE/STATISTICS command applies an application ACE to the
    specified file. The ACE does not affect access control and is
    only meaningful to the application assigning it.

    The /SHARE qualifier can be used to enable or disable statistics
    on a file currently being accessed. However, only statistics of
    new accessors of the file will be measured.