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MF60658 - OSP-DB Database Access Path Build Resource Consumption Tunin

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-DB Database Access Path Build Resource Consumption Tunin


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
NONE



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
Jobs performing database access path (index, logical file, etc)
builds and rebuilds quickly yield resources to competing jobs
(normally jobs that are performing insert, update and delete
operations to the physical file (table) rows/records).   In many
cases, the access path job has low CPU consumption and high
clock time (its yielding to the other jobs and waiting to stay
out of the way).

CORRECTION FOR APAR MA44878 :
-----------------------------
This PTF tunes the access path build processing to yield less
often and reduce its wait/sleep duration during each yield
iteration.  Thus, the access path job will progress more
consistently.  This however, does create an environment where
the formerly yielded to insert/update/delete jobs aren't yielded
to as often, which increases their clock based execution time.

CIRCUMVENTION FOR APAR MA44878 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R2M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA44878
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C6127720


System i Support

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Document Information

Modified date:
01 October 2015