/sys$common/syshlp/helplib.hlb EDIT, /FDL, Qualifiers, /EMPHASIS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /EMPHASIS=tuning-bias

    This qualifier provides you with a choice between smaller
    buffers and flatter files. You can use /EMPHASIS with the
    /NOINTERACTIVE qualifier if you want EDIT/FDL to be executed
    without an interactive terminal dialogue.

    FLATTER_FILES    Generally increases bucket size. The bucket
                     size, in turn, controls the number of levels
                     in the index structure. If a larger bucket size
                     eliminates one level, then you should use this
                     option. At some point, however, the benefit of
                     having fewer levels will be offset by the cost
                     of scanning through the larger buckets.

    SMALLER_BUFFERS  Generally decreases the amount of memory you
                     have to use.

    Example

  $ EDIT/FDL/EMPHASIS=SMALLER_BUFFERS TEMP_DATA

    This command begins an interactive session in which the default
    value for the bucket size emphasis has been changed from FLATTER_
    FILES to SMALLER_BUFFERS. TEMP_DATA is the name of the FDL file
    to be created.