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MF63213 - OSP-PERFM INDEX NOT USED DUE TO INCORRECT 'IS NOT NULL' EKR

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PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-PERFM INDEX NOT USED DUE TO INCORRECT 'IS NOT NULL' EKR


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770999  V7R2M0    MF60658   00/00    0000
PRE  5770999  V7R2M0    MF59916   00/00    0000
PRE  5770999  V7R2M0    MF59834   00/00    0000
CO   5770999  V7R2M0    MF59279   00/00    0000
CO   5770999  V7R2M0    MF59291   00/00    0000
CO   5770999  V7R2M0    MF57839   00/00    0000
CO   5770999  V7R2M0    MF57725   00/00    0000
CO   5770999  V7R2M0    MF57840   00/00    0000
CO   5770999  V7R2M0    MF57841   00/00    0000
CO   5770999  V7R2M0    MF57843   00/00    0000
CO   5770999  V7R2M0    MF57844   00/00    0000



NOTICE:
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APAR Error Description / Circumvention

-----------------------------------------------
EKR was giving an estimate of 100% for the IsNotNull when
actually all rows are Null for a particular column. This invalid
estimate caused the desirable index to not be used.

CORRECTION FOR APAR MA46186 :
-----------------------------
The algorithm for calculating the number of non-NULL values for
a given key was found to have a bug that resulted in an estimate
of 100% when it should have been 0%.  The estimate problem is
specific to EKRs that are trying to determine the non-NULL
count.

CIRCUMVENTION FOR APAR MA46186 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF63082      LIC-DB-OTHER-SRCB6005121-LOOP RECURSION IN DB INDEX FUNCTION
   MF62917      OSP-MSGCPF8199 INDEX INCORRECTLY MARKED DAMAGED DURING IASP
   MF62637      OSP Database maintain dababase index unique key counts and r
   MF62558      OSP-DB LIC DB Parallel index build cash performance tuning
   MF62405      OSP Database maintain dababase index unique key counts and r
   MF61560      OSP-DB Database IPL/Vary on Database Processing Improvements
   MF59271      OSP-DB INTERNAL MAINTENANCE
   MF62272      LIC-DB Future release compatibility changes
   MF62238      OSP-F/EXSNDPM-T/QQQQUERY-MSGMCH3203 OPNQRYF LEADS TO MSGMCH3
   MF61948      LIC-DB-OTHER-UNPRED Internal Database Maintenance
   MF61600      OSP-DB General
   MF61516      LIC-DB Put out info VLOG for long running Catch-Up (Phase 2)
   MF61315      LIC-DB Put out info VLOG for long running Catch-Up
   MF61288      OSP-DB DataBase Vary-On processing to avoid tolerated except
   MF61170      OSP-DB DataBase Vary-On processing to avoid tolerated except
   MF61157      OSP-DB LIC DB Index Build Concurrency Tuning
   MF60892      OSP-DB Internal Maintenance for SLIC DB IPL/Vary-on
   MF60781      OSP-DB-OTHER-UNPRED DOCUMENTING WHEN THE UNIQUE COUNTS FOR A
   MF60666      LIC-DB Internal maintenance
   MF60661      OSP-DB Database Access Path Build Resource Consumption Tunin
   MF60572      LIC-DB Internal maintenance
   MF60559      OSP-DB LIC DB Index Build Concurrency Tuning
   MF60072      LIC-DB Internal maintenance
   MF60059      LIC-DB-OTHER-F/MCH0601-T/DBPMEVIRRNPROBENODE Query referenci
   MF59903      OSP-DB Internal maintenance
   MF59884      OSP-DB Restore performance with lots of database files and R
   MF59818      LIC-DB Opening a delayed maintenance Access Path causes cont
   MF59762      LIC-DB-OTHER-UNPRED TEMP STORAGE GROWTH DUE TO TEMP RADIX IN
   MF59674      LIC-DB EVI on IASP not refreshing when overflow reaches thre
   MF59597      LIC-DB-OTHER-F/#DBXSIZE-T/QDBMAINT-MSGMCH2804 INDEX ACCESS P
   MF59492      LIC-DB-OTHER-PERFM Performance improvements for SQE EVI Acce
   MF58528      OSP-DB-OTHER-UNPRED NEED A WAY TO IDENTIFY A ACCESS PATH REB
   MF59475      OSP-DB-OTHER-UNPRED VL06001389 INDEX INVALIDATED. FILES SHOW
   MF59455      LIC-DB-JRN EVI refresh inhibits force, impacts journal sync
   MF59275      OSP-DB-OTHER-PERFM SCAN OF EVI OVERFLOW AREA CAUSES PERFORMA
   MF58199      LIC-DB-UNPRED Index build status file 16 byte alignment
   MF57915      LIC-DB-OTHER-UNPRED Internal Database Maintenance
   MF57842      LIC-DB-OTHER-UNPRED Internal Database Maintenance

Summary Information

System..............................i
Models..............................
Release.............................V7R2M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA46186
Superseded by:......................View fix details for PTF MF69499
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C7290720


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Document Information

Modified date:
23 February 2022