>- And finally, if it is an application programmer type asking, 
>the answer is just plain No.  (-:

And from a production operations point of view, how would you
implement job restartability if the PS data set was being
updated in place? You can't unless you also implement check
pointing the updates.

It's probably safer and not too much slower (depending on data 
size) to apply the necessary changes while copying the data
set to a new instance. Simplifies restart a great deal.

-- 
Peter Hunkeler
Credit Suisse

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