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Releasing Unused space allocation on a VSAM file

 
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HP_Steve
Beginner


Joined: 09 Jul 2008
Posts: 6
Topics: 3
PostPosted: Thu Aug 05, 2010 12:21 pm    Post subject: Releasing Unused space allocation on a VSAM file Reply with quote
Can anyone tell me, does the RLSE parm work on a VSAM file allocated in a JCL?

So, when I use RLSE on a flat sequential dataset, like this:-

Code:
//APPREP1  DD DSN=QA.TEST.CR13683.TC1.APPREP1,
//         DISP=(NEW,CATLG,DELETE),           
//         DCB=(LRECL=32756,BLKSIZE=32760,   
//         RECFM=VB,DSORG=PS),               
//         SPACE=(CYL,(10,1),RLSE),AVGREC=U 


Unused space is released as I expect in the resulting dataset:-

Code:
Current Allocation       
 Allocated cylinders : 1
 Allocated extents . : 1


If I try doing the same with an ES file, allocated like this:-

Code:
//CACHE1   DD DSN=QA.TEST.CR13683.TC1.CACHE1, 
//         DISP=(NEW,CATLG,DELETE),RECORG=ES, 
//         DCB=(LRECL=32756,BLKSIZE=32760),   
//         SPACE=(CYL,(10,1),RLSE),AVGREC=U   


Selecting the .DATA portion of the file afterwards in 3.4 still shows the full allocation:-

Code:
Current Allocation       
 Allocated cylinders : 10
 Allocated extents . : 1 


So it kind of looks like RLSE does nothing on a VSAM file??

If that's true is there some other way to achieve this? (I don't klnow how many records will be writtent to the file up front, so I have to allocate it large enough to accept the maximum I expect).

Thanks!
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dbzTHEdinosauer
Supermod


Joined: 20 Oct 2006
Posts: 1411
Topics: 26
Location: germany
PostPosted: Thu Aug 05, 2010 12:26 pm    Post subject: Reply with quote
VSAM Demystified
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Dick Brenholtz
American living in Varel, Germany
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expat
Intermediate


Joined: 01 Mar 2007
Posts: 475
Topics: 9
Location: Welsh Wales
PostPosted: Fri Aug 06, 2010 1:19 am    Post subject: Reply with quote
NO, it does not, however by using extended facilities VSAM and allocating the correct MGMTCLAS - something that your storage management gurus should do - you can easily release unused VSAM allocations.
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HP_Steve
Beginner


Joined: 09 Jul 2008
Posts: 6
Topics: 3
PostPosted: Fri Aug 06, 2010 12:24 pm    Post subject: Reply with quote
Thanks, I will look in to extended VSAM.
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