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mogens · Beginner Joined: 12 Jun 2006 Posts: 3 Topics: 1

I have allocated a sequential dataset with DISP=SHR because I want to be able to browse the contents while my long running job is writing into it. But entering b(rowse) to this dataset in ISPF 3.4 fails with
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Best regards,
Mogens

kolusu · Posted: Tue Oct 10, 2006 8:45 am Post subject:

mogens,

Your job hasn't started writting to the dataset. The allocation you see is initial allocation of the dataset when the dsn is first opened.

Kolusu
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Kolusu
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semigeezer · Posted: Tue Oct 10, 2006 6:58 pm Post subject:

the dscb isn't rewritten until the data set is closed (or maybe goes into extents)

mogens · Beginner Joined: 12 Jun 2006 Posts: 3 Topics: 1

Thankyou for your input.

To kolusu's answer:

taltyman · Posted: Wed Oct 11, 2006 12:20 pm Post subject:

might try free=close

bablack · Posted: Mon Oct 16, 2006 1:18 pm Post subject:

DISP=SHR will not let you read a dataset which is being created. A NEW dataset will get an exclusive (EXC) ENQ on the DSNAME, which will lock out any SHR ENQs.
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Bruce A. Black
Senior Software Developer
Innovation Data Processing

mogens · Beginner Joined: 12 Jun 2006 Posts: 3 Topics: 1

Deepthi · Posted: Mon Jun 04, 2007 9:45 pm Post subject:

HI,

I am stuck up with some questions and it would be great if someone could help me out on this.

1. A VSAM file opened in an IO mode in one program can be opened in the Input mode in another at the same time. Is this right? If this is right, then will the updations or insertions from the program opening this file in the IO mode be accessible to the program which is browsing the file in the Input mode simultaneously.

2. Will deletion of records also be possible at that situation? Please confirm.

Thanks,
Deepthi
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Thanks,
Deepthi.

Our lives begin to end the day we become silent about things that matter.

expat · Posted: Tue Jun 05, 2007 2:00 am Post subject:

mogens

dbzTHEdinosauer · Posted: Tue Jun 05, 2007 3:32 am Post subject:

mogens,

Sorry for the delay in posting an answer. Had to sign-off, drink a cup of coffee and relax so that I would not be a rude as you have been.

You utilize the svc99 routines, yet appear to know very little of what is going on in MVS.

1. if you have to sit there and in real-time see what your program is doing, try using BLOCK SIZE = 1 in the program and 0 or 1 buffers in your jcl dd statement.

2. The number of buffers used for the file in your job (JCL parm on DD statement, each site has their own defaults) could very well contain all the data. Until the buffers are filled and require writing to dasd or a close is issued the buffers are not flushed.

viewing a DS as it is being populated by a process is nonsensical.
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Dick Brenholtz
American living in Varel, Germany

Bill Dennis · Posted: Tue Jun 05, 2007 7:54 am Post subject:

mogens,
I thnk the problem is that the dataset starts out as empty. Try allocating NEW and writing a header-type record so the DSCB knows it isn't empty. Close and reallocate as SHR to re-write it and I bet you can browse it while it's being written. Be sure not to code RLSE on the SPACE.
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Regards,
Bill Dennis

Disclaimer: My comments on this foorum are my own and do not represent the opinions or suggestions of any other person or business entity.

Mervyn · Posted: Tue Jun 05, 2007 8:31 am Post subject:

Guys, Mogens hasn't posted since October last year. There's not too much point in scolding him now.
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The day you stop learning the dinosaur becomes extinct

Deepthi · Posted: Tue Jun 05, 2007 8:36 am Post subject:

Hi Expat,

I have created a new thread! (Vsam read/update).
And I believe the answers to the questions are

1. YES
2. NO.
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Thanks,
Deepthi.

Our lives begin to end the day we become silent about things that matter.