Re: qtemp performance oddity.

DESCRIPTION OF PROBLEM FIXED FOR APAR MA25264 :
-----------------------------------------------
The Context Rebuild step of LIC IPL consistently takes a long
time after abnormal system terminations. The PTF for APAR
MA22147 has been applied. For Version 4, Release 5.0, the
PTF number is MF24711. For Version 5, Release 1.0, the
PTF number is MF26466.
CORRECTION FOR APAR MA25264 :
-----------------------------
APAR MA22147 provides a performance enhancement by reducing
synchronous disk writes for permanent objects in QTEMP
libraries. As a trade-off, Context Rebuild takes much longer
after an abnormal IPL.

If PTF MF24711 or MF26466 has been temporarily applied, it
can be removed. If one of those PTFs has been permanently
applied, the current PTF can be used to undo those changes.
Once the current PTF has been permanently applied, an install
is required to reapply MF24711 or MF26466.

IMPORTANT NOTE:

This PTF supersedes MF24711 or MF26466. If you order one of
those PTFs, you will also receive the current PTF. Be careful
not to apply the current PTF if you intended on applying
MF24711 or MF26466.

DEFAULT INSTRUCTIONS :
----------------------
THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME




On Thu, Feb 28, 2013 at 5:01 PM, CRPence <CRPbottle@xxxxxxxxx> wrote:

That MF26466 may have been what changed QTEMP libraries to temporary
objects; I seem to recall the decision about temp vs perm was related to
the security level. If so, do not apply that PTF; regardless, the
latest is best applied, typically. So... apply the supersede MF28377,
which if the former makes the QTEMP libraries temporary, presumably the
latter changes the code back to making the QTEMP libraries permanent.

I wonder what the MF28377 cover letter says.

Regards, Chuck

On 28 Feb 2013 12:43, Bryan Dietz wrote:

OK, so I downloaded the cover letter for MF26466

DESCRIPTION OF PROBLEM FIXED FOR APAR MA22147 :
-----------------------------------------------
Some applications such as SQL create several objects in QTEMP
and then later remove them. <<SNIP>>
CORRECTION FOR APAR MA22147 :
-----------------------------
This PTF reduces the number of disk writes done to QTEMP
libraries.<<SNIP>>

CIRCUMVENTION FOR APAR MA22147 :
--------------------------------
Run the system at security level 50.

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