At 09:06 -0700 on 07/28/2006, Edward Jaffe wrote about Re: Data set
ENQueues and DEQueues in Jobs:
Staller, Allan wrote:
I am not familiar enough w/JES3 to make a useful comment.
The initiator (IEFIIC) is not a JES program! It does what it does
without regard to the type of job entry subsystem in use.
As stated previously by others, the data set ENQs are acquired at job
initiation time. They're released at the end of the last step that
references them.
I have the impression that the initiator is also smart enough to
issue a ENQ TYPE=CHNG (to switch from ENQ=EXC to ENQ=SHR) if
subsequent steps have the DSN as DISP=SHR after the last step that
has it as DISP=OLD (ie: Exclusive).
IOW: The holding of DISP=SHR Jobs due a DISP=OLD job will get removed
with the Blocking Job only needs a DISP=SHR ENQ not when it no longer
needs the dataset (ie: When the ENQ is released as is referenced
above).
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