My bad for missing that. Short of poking through control blocks, you might
issue ISRDDN before and after your CONCAT and again after your FREE to see
what shows up at each stage.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
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jo.skip.robin...@sce.com
From: Paul Gilmartin <paulgboul...@aim.com>
To: IBM-MAIN@LISTSERV.UA.EDU,
Date: 04/02/2014 03:43 PM
Subject: Re: FREE DDNAME with concatenated datasets?
Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU>
On Wed, 2 Apr 2014 15:20:41 -0700, Skip Robinson wrote:
>CONCAT is not a standard TSO/E command. It's likely a Rexx or CLIST, in
>which case you can look at the code to see what it does. If it's an RYO
>command processor, you may not have the source.
>
I apologize for excessive brevity, indolence. Earlier in the thread, I
said, more fully (still trimming here):
...
call BPXWDYN 'alloc dd(SYSLIB) shr dsn(SYS1.MACLIB) msg(2)'
call BPXWDYN 'alloc rtddn(CAT1) shr dsn(SYS1.MODGEN) msg(2)'
call BPXWDYN 'concat ddlist(SYSLIB,'CAT1') msg(2)'
...
Not Rexx, not CLIST, not RYO, source not available:
Requesting dynamic concatenation
z/OS Using REXX and z/OS UNIX System Services
SA23-2283-00
http://pic.dhe.ibm.com/infocenter/zos/v2r1/topic/com.ibm.zos.v2r1.bpxb600/bpx1rx76.htm
>I agree with your earlier comment that handling concatenations may be
>different from single data sets because of the most likely usage of them.
>A concatenation is pretty useless unless you run a process that works on
>multiple data sets. The most common usage, SYSPROC/SYSEXEC, requires that
>specific DDNAME and would be meaningless with a system-generated DDNAME.
>OTOH there are some processes that require a data set (or volume) to be
>allocated under any random DDNAME; they just have to be allocated. In
>those cases--almost never a concatenation--a system-generated DDNAME is
>fine.
>
Hardly "pretty useless". Lots of readers here have sometimes coded in
JCL:
//SYSLIB DD DISP=SHR,DSN=SYS1.MACLIB
// DD DISP=SHR,DSN=SYS1.MODGEN
... without assigning a specific DDNAME to SYS1.MODGEN; equivalent to
what my Rexx sample(s) do.
>From: Paul Gilmartin
>Date: 04/02/2014 02:50 PM
>Subject: Re: FREE DDNAME with concatenated datasets?
>Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU>
> ...
> allocate dd(ddn) dsn(dsn1)
> allocate dd(ddn2) dsn(dsn2)
> concat ddlist(ddn,ddn2)
> free ddn
On Wed, 2 Apr 2014 17:24:45 -0500, Richard Peurifoy wrote:
>
>This makes sense to me.
>
>If I specifically allocate two files, I would expect to have to
>free two files.
>
>The free of ddn de-concats the files and frees ddn.
On Wed, 2 Apr 2014 16:50:17 -0500, Paul Gilmartin wrote:
>
> allocate dd(ddn) dsn(dsn1,dsn2)
> free ddn
>
>... frees both catenand data sets. But:
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