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Vsam Interview Qestions

 
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venkatarao

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Joined: 19 Dec 2004
Posts: 24
Location: hyderabad

PostPosted: Thu Mar 03, 2005 9:45 am    Post subject: Vsam Interview Qestions
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1.can we update or delete esds records
2.can vsam datasets store on tape
3.how can u retrive one individual record in vsam by using cobol program without using repro
4.record (80,100) is ist fixed lenth or variable lenth how we recognise
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varun

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Joined: 02 Mar 2005
Posts: 11
Location: USA

PostPosted: Thu Mar 03, 2005 10:28 am    Post subject:
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1.yes, we can update as along as the record length is same.we can also delete records..but we cannot utilise the space..i.e they r not physically deleted.

2.no, guess.
3.open the file u want to read and read the record using read statement.
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brahmanandareddy

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Joined: 16 Dec 2004
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PostPosted: Thu Mar 03, 2005 10:30 am    Post subject:
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Hi Venkatarao,

1. We can update ESDS records, but we cannot delete.

2. Donno.

3. B clear with the question.

4. For fixed length records it should b same i.e. (80, 80), if they both differ it would be variable length record.

Thank You,

Bramhananda Reddy. K.
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srividya.srinivasan

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Joined: 30 Mar 2005
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Location: Pune, India

PostPosted: Tue May 10, 2005 4:42 pm    Post subject: Vsam Interview Qestions
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Hi,

Regarding the second Question, VSAM Files can be stored on the Tape, and they can be retrived easily too.

I have accessed VSAm Files stored on TAPE through FILE AID.

Do let me know in case you have queries on that.

Regards,
Vidya
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David P

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Joined: 11 Apr 2005
Posts: 106
Location: Cincinnati Ohio

PostPosted: Wed May 11, 2005 9:26 am    Post subject:
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Hi Vidya,
As you have mentioned in your post that VSAM files can be stored on tape. Can you please elaborate more on the same.
I am asking this as random access is not possible on tapes. Tapes can be
read only sequentially.

Please explain when do we store VSAM files on tapes.Also let me know when you accessed VSAM files on tape using FILEAID what acces mode you used.

Let me know in case of any concerns.

David.
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srividya.srinivasan

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Joined: 30 Mar 2005
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Location: Pune, India

PostPosted: Wed May 11, 2005 2:25 pm    Post subject:
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Hi David,


VSAM Data Sets are moved to the TAPE for storage, to free the space on the DISC. So, if the VSAM Dataset is not used for long, they get migrated to the TAPE and are stored there.

When ever there is a need to access them we usually recall them back to the DISC From the TAPE and Access them.

As you said you can access the files sequentially from the TAPE Without Recalling them to the DISC, though i have not done it myself.

To access VSAM Data sets go to TSo-> PM -> T -> Tape Management System and then you can give the Dataset name to access.


Do let me know u r concerns,

Regards,

Vidya
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