>>> When using SORT (either DFSORT or SYNCSORT) to select a relatively
> small sample of records by (a) particular key value(s) from a *very
> large* sequential file,

Peter,

You can use STOPAFT parm to stop reading the input once you get to a
threshold value. For example  if you have file with 300 million records and
if you are only interested in only 100 records for the key 'ABC', then you
can use the following

//SYSIN    DD *
  OPTION COPY,STOPAFT=100
  INCLUDE COND=(1,3,CH,EQ,C'ABC')
/*

Thanks,
Kolusu
DFSORT Development
IBM Corporation

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