In the early days of SMS, the data class mainly provided defaults for
things like RECFM/LRECL/BLKSIZE, VSAM attributes, space attributes,
etc. Those were used at allocation time but never used again.
Since then various things have been added to the data class which are
not stored in the dataset itself, so they can only be gotten by
referencing the data class, such as DVC, so a change in the DC does
retroactively affect existing datasets. I haven't surveyed the data
class to see what else might apply
--
Bruce Black
Senior Software Developer
Innovation Data Processing
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