Hi Dave,
I tested it. Your hypothesis is false (i.e. RLSE is not done.)
Regards,
David
On 2022-05-11 13:12, Gibney, Dave wrote:
If SMS-managed and DSORG known, an unopened new allocation will have an EOF set
and RLSE will be process.
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On
Behalf Of David Spiegel
Sent: Wednesday, May 11, 2022 9:20 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Potential Resource Savings Techniques
Hi Paul,
Allocation does allocation and nothing but allocation.
It does not write anything at all.
Regards,
David
On 2022-05-11 12:17, Paul Gilmartin wrote:
On Wed, 11 May 2022 15:53:20 +0000, Farley, Peter x23353 wrote:
Only if your SYSIN is not DUMMY. When SYSIN for IDCAMS is DUMMY it
does (and can do) nothing at all, rather more expensively in CPU time than
IEFBR14, but still nothing by comparison.
Only if you are allocating and using REPRO from a DUMMY to a new
sequential file or an actual DEFINE for a VSAM cluster for instance would
IDCAMS do what you describe.
Will it not write an end-of-file at the first extent and RLSE all but
the first allocation unit of SPACE?
(I suspect the OP did not intend his use of "SYSIN".)
In the Bad Old pre-SMS Days, I sometimes relied on a primary
allocation of 0 to preclude subsequently reading residual data.
-----Original Message-----
From: <David> <Mingee>
Sent: Wednesday, May 11, 2022 11:46 AM
IDCAMS does an open and close on the new file and writes zero records,
so if RLSE is coded with the SPACE for output file(s) then the unused trks or
cyls
Are released. Secondary space will be used if needed when data is
created in the file later.
-----Original Message-----
From: David Spiegel
Sent: Wednesday, May 11, 2022 11:07 AM
I do not understand this at all.
How does any program differ from IEFBR14 (with respect to
allocation/freeing unused disk space by DD Statement)?
Maybe your shop has an Exit or add-on product which does Storage
Management?
On 2022-05-11 01:53, <David> <Minge > wrote:
5. Consider changing IEFBR14 for allocating new files to IDCAMS with
SYSIN DD DUMMY. This will release unused disk space.
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