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krishnareddymsc
New User
Joined: 08 Jan 2007
Posts: 9
Location: Bangalore
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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
CICS Moderator
Joined: 07 Nov 2005
Posts: 1104
Location: The Netherlands at Hole 19
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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
Global Moderator
Joined: 26 Apr 2004
Posts: 4652
Location: Raleigh, NC, USA
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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
DFSORT Developer
Joined: 15 Feb 2005
Posts: 7129
Location: San Jose, CA
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krishnareddymsc
New User
Joined: 08 Jan 2007
Posts: 9
Location: Bangalore
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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
Super Moderator
Joined: 30 May 2003
Posts: 1592
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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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