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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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| I have a VSAM file and I want to make it's 25 column value='N' of every record irrespective of value in that column. |
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donevin
New User
Joined: 07 Jun 2005
Posts: 70
Location: South Africa
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| a Search on "Overlay" would help. |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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Hi,
I tried OVERLAY function in SORT. and it worked.
| Code: |
//SYSIN DD *
OPTION COPY
OUTREC OVERLAY=(25:C'N')
/* |
Please let me know if there is any demerit or precautions of this command if any. |
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murmohk1
Senior Member
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Joined: 29 Jun 2006
Posts: 1436
Location: Bangalore,India
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Sudhakar,
Using one vsam both for i/p and o/p is NOT recomended (though you can use). |
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KMV
New User
Joined: 15 May 2007
Posts: 22
Location: Coimbatore
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Sudhakar,
while doing this,
| Code: |
//SYSIN DD *
OPTION COPY
OUTREC OVERLAY=(25:C'N')
/*
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If u have any packed decimal value from 1 to 24th column,it may become an issue.
correct me, if i m wrong
Regards, |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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| Thanks Murali. |
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Aaru
Senior Member
Joined: 03 Jul 2007
Posts: 1287
Location: Chennai, India
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KMV,
| Quote: |
| If u have any packed decimal value from 1 to 24th column,it may become an issue. |
Why do you think so? How does the packed decimal value from 1 - 24 affect this? |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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Hi KMV,
i tried above code using file that is having comp-3 data, and ovrlayed a column.
But in the result i could not find anything different other than overlayed column(it's value).
Please let me know if there is anything that should be taken care. |
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prakash271082
New User
Joined: 09 Sep 2005
Posts: 53
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Hi KMV,
I don't think so that we could make use of 'c' in "Overlay", if we have hex value. Hope it's clear. Even, if it has hex value from 1 to 24 column, it won't have impact when we change 25th column value. |
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KMV
New User
Joined: 15 May 2007
Posts: 22
Location: Coimbatore
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Hi
My input file TEST.INPUT.SAMPLE1 is a vsam file with 1204 length.
1-2 2/PS
3-7 5/PS
8-10 3/AN
11-12 2/PS
13-16 4/PS
17-17 1/AN
18-37 20/AN
Wen I try to modify 25th letter as N using
| Code: |
//STEP2 EXEC PGM=ICEMAN
//SYSOUT DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SORTIN DD DSN=TEST.INPUT.SAMPLE1,
// DISP=SHR
//SORTOUT DD DSN=TEST.INPUT.SAMPLE2,DISP=SHR
//SYSIN DD *
OPTION COPY
OUTREC OVERLAY=(25:C'N')
/*
//*
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21st letter is getting modified as N in TEST.INPUT.SAMPLE2
Is thr any mistake in my JCL? 
Regards, |
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Frank Yaeger
DFSORT Developer
Joined: 15 Feb 2005
Posts: 7129
Location: San Jose, CA
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| Quote: |
If u have any packed decimal value from 1 to 24th column,it may become an issue.
correct me, if i m wrong |
You are wrong. Data in other columns will have no effect on the column being overlaid.
Note that a VSAM file can be processed as either F (fixed length records) or V (variable length records). If it is processed as F, then 25: indicates the 25th position. However, if it is processed as V, DFSORT prepends a 4-byte RDW, so 25: indicates the 21st data position counting the RDW. 29: would indicate the 25th data position counting the RDW.
For information on processing VSAM files as F or V with DFSORT, see:
publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ICE1CA20/1.8.3.4?SHELF=&DT=20060615185603&CASE= |
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KMV
New User
Joined: 15 May 2007
Posts: 22
Location: Coimbatore
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Frank,
Its a fixed length record.
Regards, |
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Aaru
Senior Member
Joined: 03 Jul 2007
Posts: 1287
Location: Chennai, India
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KMV,
| Quote: |
Its a fixed length record.
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Are you sure that the input file is a fixed length file?? Please re-check. |
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KMV
New User
Joined: 15 May 2007
Posts: 22
Location: Coimbatore
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Yes Aaru....
Its a fixed length file and i have used that file many times. |
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Frank Yaeger
DFSORT Developer
Joined: 15 Feb 2005
Posts: 7129
Location: San Jose, CA
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| Quote: |
| Its a fixed length record. |
Yes, but did you tell DFSORT that with:
If not, then DFSORT may assume the records are to be processed as V, not F.
The messages will tell you if the file is being processed as F or V. If the file is being processed as F and an OVERLAY on 25: does an OVERLAY on 21: then something is seriously wrong.
If you're using DFSORT, you'd have to prove it to me by showing me the input, output and //SYSOUT messages. If you're using Syncsort, I can't help you. |
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