VMS Help CONVERT, file, Qualifiers, /SECONDARY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Increases the Convert utility's performance by reducing the
    number of required passes through the input data. This is
    accomplished by placing alternate key information into the
    CONVWORK file.

    Format

    /SECONDARY=n

    Qualifier Value
    n
    Specifies the number of alternate keys that will be loaded to
    the CONVWORK file with each pass through the input data.

    This qualifier is valid when you are fast-loading a file with
    more than one alternate key. This option allows CONVERT to use
    more disk space for its work file than would be used by default.

    The default number of alternate keys written to the CONVWORK
    file is 1.