The SORTCUTP= option
specifies the number of bytes (or kilobytes, megabytes, or gigabytes)
above which the external host sort utility is used instead of the
SAS sort program, if SORTPGM=BEST is in effect.
The following equation
computes the number of bytes to be sorted:
number-of-bytes=((length-of-obs)+(length-of-all-keys))*number-of-obs