work files required - cannot do sort in memory as requested

  Explanation:    The   work-files=0   qualifier   is   specified,
  indicating  the  data  would  fit in memory, but the data is too
  large.

  User Action:  Either increase the working set  quota,  or  allow
  the sort utility to use two or more work files.  If this message
  accompanies the MSGHLP error, SORTERR, see  the  description  of
  that message for more information.