-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Paul Gilmartin
Sent: Tuesday, February 16, 2021 4:40 PM
To: [email protected]
Subject: Re: [EXTERNAL] Re: question on enqueues
On Tue, 16 Feb 2021 22:19:56 +0000, Pommier, Rex wrote:
>Thanks, Dave, you pointed me in the right direction although the FDR
>documentation makes it sound like it doesn't matter how the DSNENQ option is
>set. I found this little tidbit in the FDR manual:
>
>If a data set name appears in a DD statement with DISP=SHR within the
>FDR job (not necessarily in the FDR step, FDR changes the scheduler
>enqueue for the data set to EXCLUSIVE (DISP=OLD). The data set may be
>unavailable to other tasks until the FDR job ends.
>
Nowadays it might downgrade the ENQ to the initial SHR status at completion.
If it cared to.
("scheduler" enqueue? What's a scheduler that performs enqueues?)
It hardly matters unless there are additional steps in the job.
-- gil
Hi Gil,
I'm not sure what a "scheduler enqueue" is either. What I do know is that FDR
"bumped" the enqueue on a PDS from SHR to OLD before starting the backup step.
In my case it wouldn't have mattered to downgrade the ENQ back to SHR at the
end of the backup because the backup takes 3 hours and the following steps in
the job run in a couple minutes. I'll just change the job to use in-stream
SYSIN instead of reading the PARMLIB. Fortunately for me its in-stream data
that will never change.
Rex
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