At 18:08 -0500 on 08/09/2006, Tom Marchant wrote about Re: Vendor JCL
(was: WHY IS JCL ALLERGIC ... ):
I can assure you that many vendors produce inferior SMP/E. SMP/E is a
powerful tool, and when the SYSMODs are coded correctly, it makes
installing and maintaining a system easy.
That is until you have to RESTORE a SYSMOD at while point SMP/E
causes you to do lots of useless work. The intent of a RESTORE is to
create a system as if that SYSMOD (and possibly SYSMODs that PRE it)
had not yet been APPLYed. The CORRECT way of doing a RESTORE
operation is to determine which elements must be backed off and which
SYSMODs contain the replacement versions of the elements. The current
implementation causes you to have to remove (and subsequently
reAPPLY) SYSMODS that have nothing to do with the one being RESTOREd.
As a simple example, SYSMOD1 contains elements A, B, and C while
SYSMOD2 contains only element B and PREs SYSMOD1. Both are currently
in APPLY status. To RESTORE SYSMOD2, I must also RESTORE SYSMOD1 (and
possibly SYSMOD3 which PREs SYSMOD1 since it contains a newer copy of
A and/or C but not B). All that is needed is to just reAPPLY element
B from SYSMOD1 and you have RESTOREd SYSMOD2 but SMP/E goes through
useless work to back off A and C also (along with other elements in
SYSMODs on the PRE chain that is anchored at SYSMOD1) only to then do
an APPLY (sans SYSMOD2) of all the erroneously RESTOREd SYSMODs. If
all you want to do is RESTORE B, you should run the element SUP chain
on B until you find a copy to APPLY/use (in this case the copy in
SYSMOD1) and ignore everything else. RESTORE is a flawed design since
it involves elements that are not affected when the correct versions
are available from SYSMODs still in APPLY status or from the DLIB
copy of the element.
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