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to copy last 50 records of a flat file

 
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krishnareddymsc

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Joined: 08 Jan 2007
Posts: 9
Location: Bangalore

PostPosted: Thu Jan 11, 2007 3:56 pm    Post subject: to copy last 50 records of a flat file
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How can we copy last 50 records from a flat file to another file....as we dont know tha max number of records in that file.....and also pls explain for the same with ksds files........thanku...............
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Bitneuker

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Joined: 07 Nov 2005
Posts: 1105
Location: The Netherlands at Hole 19

PostPosted: Thu Jan 11, 2007 3:59 pm    Post subject:
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Repro with IDCAMS to dummy-file and you know the number of records. Then repro with SKIP total number minus 50. Also check the sortforum where Frank offers a lot of solutions.
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superk

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Joined: 26 Apr 2004
Posts: 4650
Location: Raleigh, NC, USA

PostPosted: Thu Jan 11, 2007 7:31 pm    Post subject: Re: to copy last 50 records of a flat file
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You sort the dataset, adding a sequential counter to the end of each record.

Then, you sort the data on the sequential counter in descending order, stopping after 50 records.

Finally, resort the data on the sequential counter in ascending order, and remove the count value from the output.
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Frank Yaeger

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Joined: 15 Feb 2005
Posts: 7130
Location: San Jose, CA

PostPosted: Thu Jan 11, 2007 10:41 pm    Post subject:
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You can use the technique shown in the "Keep the last n records" Smart DFSORT Trick at:

http://www.ibm.com/servers/storage/support/software/sort/mvs/tricks/
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krishnareddymsc

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Joined: 08 Jan 2007
Posts: 9
Location: Bangalore

PostPosted: Fri Jan 12, 2007 2:16 pm    Post subject: reg: copy 50 records ina anew file
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Hi all,
thanx for your nice reply..........I think I gt my answer.....with your views....sone more thing...can you explain the same...with VSAm Ksds files......?
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mmwife

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Joined: 30 May 2003
Posts: 1592

PostPosted: Sun Jan 14, 2007 12:27 pm    Post subject:
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You can use this for flat files too.
Code:

//COPYKEY EXEC PGM=FILEAID
//DD01     DD  DSN=YOUR.VSAM.FILE
//DD01O    DD  DSN=file.contains.50highest.key.recs
//SYSIN    DD  *
$$DD01 COPYBACK OUT=50
/*
//*
//NEXT    EXEC PGM=....
//HIGHKEY DD DSN=file.contains.50highest.key.recs,
//etc....
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