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for large files, can sort input & outfile be the same fi

 
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quanzhong

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Joined: 12 Aug 2008
Posts: 46
Location: china

PostPosted: Tue Jul 08, 2014 2:37 am    Post subject: for large files, can sort input & outfile be the same fi
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eg.
Code:

//SORTIN    DD DISP=SHR,DSN=A
//SORTOUT DD DISP=SHR,DSN=A
//SYSIN       DD *
   option copy
   outrec ifthen=(when=(condition),overlay=())
/*


for small files, the result is OK.
for large files, sorting completed, return code is 0, but number of record in output file is much less.

does anyone know the difference?
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vasanthz

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Joined: 28 Aug 2007
Posts: 1476
Location: Chennai

PostPosted: Tue Jul 08, 2014 3:41 am    Post subject:
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Hello,
Quote:
For a copy application, the SORTIN data set should not be the same as the SORTOUT data set or any OUTFIL data set because this can cause lost or incorrect data or unpredictable results.

For a sort application, the SORTIN data set should not be the same as any SORTWKdd data set because this can cause lost or incorrect data or unpredictable results. The SORTIN data set can be the same as the SORTOUT data set or an OUTFIL data set, but this situation can lead to the loss of the data set if the sort application does not end successfully.

Simply said, don't use the same file as Input and Output.
http://ibmmainframes.com/about56709.html

Hope it helps,
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steve-myers

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Joined: 30 Nov 2013
Posts: 496
Location: The Universe

PostPosted: Tue Jul 08, 2014 3:55 am    Post subject:
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For a sorting application, the input and output data set can specify the same data set. It is not recommended, but it will work because sort reads the entire input data set before it writes an output record.

For a copy application it will not work, as Vasanth already noted.
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