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Compress pds size using DISP=SHR in JCL

 
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HappySrinu

Active User


Joined: 22 Jan 2008
Posts: 195
Location: India

PostPosted: Thu Apr 16, 2009 1:27 pm    Post subject: Compress pds size using DISP=SHR in JCL
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Experts,
Please share on the disadvantages of doing a compression using DISP=SHR for any pds which hold by any CICS regions etc..

Situation:
ProductionLoadlib PDS: AAAA.BBBB.CCCC
Always hold by CIC01, CIC02, CIC03 regions.

It 's getting difficult release this load from cics regions, so

Proposed solution:
Using DISP=SHR, DSN=AAAA.BBBB.CCCC in JCL to compress this production loadlib.

Would like to know suggestions/demerits etc on this proposal.

Thanks,
Srini
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Anuj Dhawan

Senior Member


Joined: 22 Apr 2006
Posts: 6258
Location: Mumbai, India

PostPosted: Thu Apr 16, 2009 3:30 pm    Post subject:
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Hi,

If the dataset has DISP=SHR, a batch compress job will work but I believe it's not a good idea; I did it couple of times but my process was just for my experments so I was safe. Compress changes the member locations in the PDS and that can impact address spaces that have already opened the dataset. The problem can be if the current users of the dataset don't refresh their data once the compress is done, they could be attempting to refer to members in locations that are not in use anymore, or even in use by a different member.
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dick scherrer

Site Director


Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Thu Apr 16, 2009 9:31 pm    Post subject:
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Hello,

You need to compress this dataset while cics is down / being re-cycled. . .

You might consider changing from the pds to a pdse.
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