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.