On 4 Feb 2006 10:18:42 -0800, in bit.listserv.ibm-main
(Message-ID:<[EMAIL PROTECTED]>)
[EMAIL PROTECTED] wrote:
I agree wholeheartedly with Robert (and, I think, Arthur. His
position is less clear to me.) However, we will be a distinct
minority. In particular, Kurt Q. takes the opposite side:
Linkname: IBM-MAIN archives -- October 2001
(#1977)
URL:
http://bama.ua.edu/cgi-bin/wa?A2=ind0110&L=ibm-main&P=R97276
Because that is not what RESTORE does. As designed
and implemented,
RESTORE's function is to un-do whatever happened
during APPLY and to
bring the target libraries back to an "accepted"
service level, which by
definition is the the level found in the distribution
libraries. I
think I understand what you are asking for, but that
is not what RESTORE
does.
At least what we desire is to be considered a Requirement
for a new function
(call it UNDO), not merely an enhancement to RESTORE.
Yes, you agree with me.
It's true that RESTORE, by design and function, takes
us back to the ACCEPTed level. In some cases, that's what
you want; "Bring me back to just after the previous PUT
level", for instance.
What I've found more often, though, is that I would
like to back off a single PTF or APAR. Currently, that is
usually difficult or impossible, unless you happen to be
trying just after an ACCEPT. The catch-22 is that you
don't want to ACCEPT maintenance until you're *sure* it's
not a problem.
So yes, RESTORE has a valid place. But that place
does not allow one to un-APPLY a single mod out of many
that have been APPLYed since the last ACCEPT. Your idea of
an UNDO command would be wonderful.
I do suspect that implementing UNDO would be *very*
tricky. PREs and SUPs would be a problem, especially as
any mod with a PRE for the mod you're UNDOing would also
have to be UNDOne. Finding the "before" data and getting
it properly linked/bound/copied would be another
hurdle. Despite that, it would be a very handy tool, and
would probably be used much more than RESTORE if it were
available.
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