W dniu 2012-08-28 17:59, Roger W. Suhr pisze:
No, it's not illogical. We use Format 1 DSCB entries as model DSCB for
GDG's and other things. No data space use is needed for that, so we
allocate TRK=0. No problem there!
Well, it depends on the point of view.
Datasets "by definition" are for keeping data, not to make GRS ENQ, not
to be DSCB model (BTW: haven't heard anyone about SMS? DATACLASS or even
LIKE?). Zero-space dataset is like PDS with zero directory. Possible to
create, but not usable as intended.
BTW: it's NOT similar to /dev/null or DD DUMMY. Zero-space dataset is
real object, consuming real resources (VTOC, maybe catalog) with no real
(as intended) use.
Of course, as I already said, it's perfectly possible, legal and IBM
supported to use such datasets for the purposes as above or maybe others
as well.
BTW2: Another parallel comes to my mind: IEFBR14. Usually we expect the
program to do something. ;-) Usually we expect dataset to contain some
data...
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Radoslaw Skorupka
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