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hemakumarl · Beginner Joined: 19 Feb 2004 Posts: 7 Topics: 3

Hi,

This is regarding READ PREVIOUS record in the cobol batch code. I would like to know is there any command to read previous record in the KSDS file using COBOL batch code.

Also I would like to know what is basic difference between SEQUENTAIL and DYNAMIC access modes. Since we are having all the options in SEQUENTAIL what is DYNAMIC defined for.

Thanks in advance.

Regards,
Hemakumar
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Hemakumar L.

ofer71 · Posted: Mon Feb 13, 2006 10:01 am Post subject:

Regarding your first question: As far as I know, there is no 'READ PREVIOUS' statement in COBOL on mainframes.

Regarding your second question: You'll find full answer in the fine manual.

O.
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Formula BMW

hemakumarl · Beginner Joined: 19 Feb 2004 Posts: 7 Topics: 3

Thanks for your reply.

I am looking for an option to read previous record in the KSDS file when the pointer is at particular record. If we condsider CICS we have option READPREV, on the same lines is there any command to read previous records in the bacth code.

Regards,
Hemakumar

ofer71 · Posted: Tue Feb 14, 2006 12:43 pm Post subject:

No.

O.
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Honda H4 transmission

MikeBaker · Beginner Joined: 04 May 2004 Posts: 96 Topics: 9

What the fine manual will not tell you is that RANDOM will cause NIS-mode splits, but DYNAMIC will cause SIS-mode splits; ie: there are two different types of CA/CI split. If you choose the wrong type of split for your data, then performance can go out the door. And don't mix update modes on the same file.

shiv_swami · Beginner Joined: 29 Nov 2003 Posts: 68 Topics: 14

Hemakumar,

To read previous record, you can always move just record into a variable working storage and use it whenever you require to. I can share an example if needed.
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Regards,
Shivprakash

hemakumarl · Beginner Joined: 19 Feb 2004 Posts: 7 Topics: 3

Thanks MikeBaker and Shiv.

I am interested to know about NIS-mode and SIS-mode splits. Can you please provide me the link for same.
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Hemakumar L.

MikeBaker · Beginner Joined: 04 May 2004 Posts: 96 Topics: 9

This information comes from Ron Ferguson, the world's foremost expert on VSAM. The information is in his book called "VSAM". He also recently presented at SHARE, and presented two great sessions on VSAM performance. You'll need to logon as a trial member (free of charge), and goto the SHARE 2004 Longbeach session. You'll find 2 PDFs there.

www.share.org Sorry I don't have the exact urls on me.