At 12:22 -0400 on 08/01/2006, Wayne Driscoll wrote about Re: Data set
ENQueues and DEQueues in Jobs:
I could see how a downgrade would be useful. For instance: I have a
resource shared. Now I need to update the resource, so I perform an
S->E. Now, I want to allow others to see the update, but I don't want
to allow an exclusive user to lock me out of the resource, so a E->S
change would allow this to happen.
Even more importantly, as I've noted in prior messages in this
thread, the capability to do a E->S downgrade would fix the current
"Design Flaw" in the Initiator where if you follow a Job Step that
has DISP=OLD/MOD for a Dataset with DISP=SHR Job Steps, these
subsequent Job Steps keep the exclusive ENQ until the Job is over (or
there are no more steps using the dataset). Support for E->S
downgrade would allow other jobs to take off once the last
DISP=OLD/MOD step is done and the first DISP=SHR step starts.
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