Actually, this was recently explained to me by IBM. (MOD,DELETE)
indicates that the dataset might exist, if it does, then MOD it. If
it does not, then create it and then delete it. But SPACE would be
required in any case where the dataset did not exist. This would also
be true for (MOD,KEEP). In this case, if the dataset did not exist it
would be created, and KEPT, but not cataloged. SPACE would be
required if the dataset did not exist.
Doug
At 01:46 AM 5/23/2007, you wrote:
Paul
You got my attention with the subject line, DISP=(MOD,DELETE), since
I used to encourage students to consider using this "trick" in order
to immunise their JCL against irritating errors when they had
usually started task procedures relating to networking products and
they didn't care whether or not a data set existed when the task was
started. The types of data sets involved were for traces, logs and dumps.
Typically the started task procedure had an IEFBR14 step where the
data sets were definitely erased if they happened to exist - from,
typically of course, any previous execution - using the
DISP=(MOD,DELETE) "trick". The IEFBR14 step was then followed by the
"business" step.[1]
What you show in fact is DISP=(MOD,KEEP).
An explanation - not at all necessarily *the* explanation since it's
very much a guess - for the IEF285I message is that, with DISP=MOD,
logically the data set is considered to exist and thus it can
logically be "kept". However, with, DISP=NEW, the data set is
considered *not* to exist - and you get another error presumably
earlier in the processing sequence if it does exist - and so, before
it can be "kept", it must actually be created. In order to be
created, the SPACE parameters are needed.
So *I* understand it. Of course whether or not I understand it
correctly is quite another thing!
Chris Mason
snip>>>>>>>>>>>>>>>
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Doug Fuerst
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