RE: CLRLIB QRPLOBJ?? (was Re: IPL regains storage.......but)

["Walden H. Leverich" <WaldenL@xxxxxxxxxxxxxxx>]

Actually, I've had an interesting thought on this subject.

Let's say you have a user that is running some job that uses the IBM program
QAWXXPGM (I made the name up.) Now, I go and install a PTF that replaces
QAWXXPGM. To do the replacement it renames QAWXXPGM to QPZ0001 and puts the
new QAWXXPGM into QSYS. Now that user still has the _original_ program in
his stack and if you look you'll see QPZ0001 in the call stack. Now let's
say I then apply that PTF perm. Won't that delete QPZ0001 since it's no
longer needed? What will happen to that user that has it in their stack?
Boom? Maybe that is why objects are moved into QRPLOBJ on an apply perm.
These objects (at least programs) may still be needed by an active job.
However, at IPL it's safe to say they're no longer needed.

As to when it's safe to clear QRPLOBJ, if you clear it at times other than
IPL you may run the risk of blowing up active jobs. If you _know_ that no
one is using those programs, great, but are you sure?

-Walden

-----Original Message-----
From: Alexei Pytel [mailto:pytel@us.ibm.com]
Sent: Monday, August 27, 2001 12:54 PM
To: midrange-l@midrange.com
Subject: RE: CLRLIB QRPLOBJ?? (was Re: IPL regains storage.......but)


I've had to do some investigation.
I was wrong in my previous post.
The bottom line is PTF process moves data to QRPLOBJ only if it is not
supposed to be used anywhere on system.
So as far as system itself is concerned it is safe to clear QRPLOBJ
anytime.

    Alexei Pytel

"The better is the worst enemy of the good"


----- Forwarded by Alexei Pytel/Rochester/IBM on 08/27/2001 11:53 AM -----

                    Alexei Pytel
                                         To:     midrange-l@midrange.com
                    08/25/2001           cc:
                    06:26 PM             From:   Alexei
Pytel/Rochester/IBM@IBMUS
                                         Subject:     RE: CLRLIB QRPLOBJ??
(was Re: IPL
                                         regains storage.......but)(Document
link: Alexei
                                         Pytel)









When PTF is applied - say a program object is replaced - the old object is
moved to QRPLOBJ.
In this way jobs which were using old program will continue to use it.
Deleting a program when some job is executing instructions from this
program, will cause the job to fail.
This is why PTF process uses QRPLOBJ.
It is safe to clear QRPLOBJ at IPL time, because there are no jobs using
any object from QRPLOBJ.

Earlier in this thread Tom Liotta said that you should be careful what you
remove from QRPLOBJ - very true.

Best regards
    Alexei Pytel

"The better is the worst enemy of the good"



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