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MF66537 - LIC-DB-INCORROUT AN SQL SELECT USING WHERE XXX = '' RETURNS

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-DB-INCORROUT AN SQL SELECT USING WHERE XXX = '' RETURNS


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770999  V7R3M0    MF64485   00/00    0000
PRE  5770999  V7R3M0    MF62600   00/00    0000
CO   5770999  V7R3M0    MF66536   00/00    0000
CO   5770999  V7R3M0    MF66441   00/00    0000
CO   5770999  V7R3M0    MF66442   00/00    0000
CO   5770999  V7R3M0    MF65717   00/00    0000
CO   5770999  V7R3M0    MF65670   00/00    0000
CO   5770999  V7R3M0    MF65488   00/00    0000
CO   5770999  V7R3M0    MF65370   00/00    0000
CO   5770999  V7R3M0    MF65270   00/00    0000
CO   5770999  V7R3M0    MF65143   00/00    0000
CO   5770999  V7R3M0    MF63758   00/00    0000
CO   5770999  V7R3M0    MF63468   00/00    0000
CO   5770999  V7R3M0    MF61339   00/00    0000
DIST 5770SS1  V7R3M0    SI59580   00/00    0000



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APAR Error Description / Circumvention

-----------------------------------------------
An SQL Select using a CHAR(0) field (WHERE xxx = '') in a WHERE
clause returns an incorrect result whereas using the complete
field length (WHERE xxx = ' ' returns the correct result.

CORRECTION FOR APAR MA47900 :
-----------------------------
The query was implemented using an Index Scan plan with an index
that had a sort sequence table applied to it.  The single byte
blank was weighted to a different weight and that weighting was
not applied correctly when padding the empty string to the
length of the column.  This problem could appear unpredictable
depending on the implementation and the order in which the
optimizer initially processed available indexes containing
Select/Omit criteria.  The problem has been corrected.

CIRCUMVENTION FOR APAR MA47900 :
--------------------------------
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
--------------  ------------------------------------------------------------
   MF66535      OSP-UNPRED PLAN CACHE GATING
   MF66445      OSP-PERFM OPNQRYF PERFORMANCE PROBLEM WHEN USING PHYSICAL FI
   MF66440      OSP-DB-OTHER-MSGSQL0901 AFTER PTFS INSTALLED, JOB STARTED TO
   MF66417      OSP-DB-OTHER-INCORROUT SELECT STMT WITH FIELDPROC RETURNS IN
   MF66370      OSP-DB-OTHER-F/DBPMTRAP-T/QQQOOODBOP-MSGMCH3203 MSGMCH3203 F
   MF66295      OSP-DB-OTHER-F/DBOPEXPRPREDMISC-RCX/5094-MSGMCH3203 QUERY/40
   MF66175      OSP-UNPRED NAVIGATOR FOR I MTIS DELETED COUNT IS INCORRECT
   MF66023      LIC-DB-OTHER-INCORROUT Possible data corruption with MIN/MAX
   MF65716      OSP-DB-OTHER-PERFM PERFORMANCE IMPROVEMENT TO QDS IO COSTING
   MF65671      OSP-DB-OTHER-F/DBPMTRAP-T/QDBGETMQO-MSGMCH3203 MSGMCH3203 F/
   MF65602      OSP-INCORROUT GETTING NULL BACK FROM THE COALESCE/REGEXP_REP
   MF65547      OSP-DB-OTHER-F/DBOPACCESSPLANINDEXRANDOMIOX/5108-MSGMCH3601
   MF65521      SQL-RUN COMPLEX SQL QUERY FAILS INTERMITTENTLY
   MF65515      LIC-DB-OTHER Internal maintenance
   MF65487      LIC-DB-INCORROUT Recursive Query
   MF65441      OSP-MSGCPF4204 INTERNAL QUERY FAILURE RELATED TO LOOK-AHEAD
   MF65434      OSP-DB-OTHER-F/DBPMHASH-T/QDBGETMQO-MSGMCH3402 DRDA APPLICAT
   MF65421      OSP-OTHER-PERFM QUERY IS BEING RE-OPTIMIZED UNNECESSARILY
   MF65409      LIC-DB-OTHER change to Visual Explain for Workload Group
   MF65369      LIC-DB-OTHER Internal Database Maintenance.
   MF65352      OSP-DB-OTHER THE SYSTEM IS CREATING DUPLICATE MTI'S (TEMPORA
   MF65299      LIC-DB-OTHER-F/DBOPEXPRVALMISC-T/QQQOOODBOP-MSGMCH3203 RCAC
   MF65298      Corrects LIMIT/OFFSET precedence for prepared attributes.
   MF65266      LIC-DB-OTHER-PERFM SQL OPTIMIZATION TIME PERFORMANCE ISSUE W
   MF65223      DATAPARTITIONNUM update lock fence and constant fixes.
   MF65225      OSP-LOOP OPNQRYF WITH MANY WITH MANY LOGICAL XORS (&&) CAN R
   MF65216      LIC-DB-OTHER-PERFM COMPLEX CONNECT BY QUERY RUNS POORLY AFTE
   MF65202      OSP-DB-OTHER-PERFM GATE CONTENTION ON HEAP ALLOCATIONS DURIN
   MF65183      OSP-DB-OTHER-PERFM INTERMITTENT POOR QUERY PLANS FOR INSERT
   MF65144      LIC-DB-OTHER Allow duplicate keys in JSON_OBJECT and JSON_OB
   MF65089      LIC-DB-MSGMCH3203 Affinity Error on complex query
   MF65071      OSP-DB-OTHER-INCORROUT UDTF - 'NO EXTERNAL ACTION'
   MF65041      OSP-PAR-940XMISC PLANS THAT MAY BE IN USE FROM JOBS IN ONE P
   MF65024      LIC-DB-PERFM Poor query performance due to plan choice
   MF64970      OSP-DB-OTHER-F/DBPMTRAP-T/QDBGETM-RC1720-MSGMCH3203 MSGMCH32
   MF64958      OSP-DB-OTHER-INCORROUT A RPG CHAIN MAY NOT FIND CORRECT VALU
   MF64926      LIC-DB-OTHER-PERF COMPLEX OLAP QUERY CONSUMES EXCESSIVE SEGM
   MF64895      OSP-DB-OTHER-F/DBOPAFFINITY-T/QQQOOODBOP-MSGMCH3203 A MSGMCH
   MF64877      LIC-DB-OTHER-INCORROUT UDTF - 'NO EXTERNAL ACTION' with LOB
   MF64846      OSP-OTHER-PERFM QUERY OPTIMIZATION TIME
   MF64812      LIC-DB-OTHER-F/HMDERIVEDHEAP-T/QQQOOODBOP-RCX/5094-MSGMCH320
   MF64766      LIC-DB-OTHER Internal Maintenance
   MF64740      PERFM-HLIC-94XXBASE NON OPTIMAL JOIN ORDER SELECTED DUE TO I
   MF64721      LIC-DB-OTHER-PERFM CACHED STRATEGIES WITH QDSPOPULATES USED
   MF64666      OSP-DB-OTHER-F/DBPMTRAP-T/QDBGETMQO-MSGMCH3203 RUNNING AN SQ
   MF64588      LIC-DB-OTHER-PERFM QUERY PERFORMANCE WITH PARTITIONED TABLE
   MF64543      LIC-DB-OTHER-PERF POOR PERFORMING SQL USING SMP
   MF64532      LIC-DB-OTHER Internal Database Maintenance.
   MF64526      LIC-DB-OTHER-PERFM SYNCHRONIZE MTI ACCESS IN AN TRACING OR E
   MF64511      OSP-OTHER-PERFM QUERY PERFORMS POORLY WHEN SKEWED DATA IS PR
   MF64511      OSP-OTHER-PERFM QUERY PERFORMS POORLY WHEN SKEWED DATA IS PR
   MF64406      OSP-DB-OTHER-F/QSQRUN3X/32832-T/SAME-MSGSQ20478 UPDATE ON A
   MF64405      OSP-F/DBPMTRAP-T/QQQOOODBOP-RC1720-MSGMCH3203 MCH3203 F/DBPM
   MF64405      OSP-DB-OTHER-F/DBOPAFFINITY-T/QQQOOODBOP-MSGMCH3203 SQL0901
   MF63435      LIC-DB-OTHER-PERFM Optimization time improvements for comple
   MF64348      LIC-DB-MSGMCH3203 F/T DbpmTrap/QDBGETM vlog
   MF64343      LIC-DB-OTHER Query with grouping sets and table function fai
   MF64292      LIC-DB-F/QQQOOODBOP-MSGCPF427F-MOD/QQQOOOINV CPF427F, SQL066
   MF64282      OSP-DB-OTHER-SAP400-THREADS-INCORROUT SELECT STMT WITH '=' ,
   MF64243      F/OPTIMIZER-UDFINCORROUTAFTERCLEARINGPLANCACHE UDF INCORRECT
   MF64226      OSP-OTHER PERFORMANCE OF A USER DEFINED FUNCTION (UDF)
   MF64141      LIC-DB-OTHER Internal Database Maintenance.
   MF64067      LIC-DB-OTHER Internal Database Maintenance.
   MF64013      LIC-DB Internal Maintenance
   MF64008      LIC-DB-OTHER Internal Database Maintenance.
   MF62513      OSP-DB-OTHER-T/QQQOOODBOPX/4720-MSGMCH3203 A LEFT OUTER JOIN
   MF62513      OSP-DB-OTHER-T/QQQOOODBOPX/4720-MSGMCH3203 A LEFT OUTER JOIN
   MF63978      LIC-DB-OTHER Potential incorrect output with EVI only access
   MF63976      LIC-DB-INCORROUT MTI with LOB column
   MF63944      LIC-DB-PERFM reorder predicates based on selectivity
   MF63944      LIC-DB-PERFM reduce data copies for SQL query
   MF62773      LIC-DB Query fails over table with an EVI with INCLUDE and w
   MF63899      LIC-DB Internal Maintenance
   MF63844      LIC-DB_OTHER Support displaying more than 1TB in Visual Expl
   MF63837      OSP-DB-OTHER-F/DBOPAFFINITY-T/QQQOOODBOP-MSGMCH3203 UNION
   MF63761      LIC-DB-PERFM Database Monitor 3010 record
   MF63746      OSP-DB-OTHER-F/DBPMTRAP-MSGMCH3203 QRYDFN FAILS W/ MCH3203 F
   MF63713      OSP-UNPRED QUERY ESTIMATED RUNTIME WITH XMLELEMENT FIELD SEL
   MF63629      LIC-DB-OTHER Database temporary storage usage increases
   MF63603      LIC-DB Internal Maintenance
   MF63582      LIC-DB-OTHER-PERFM COMPLEX QUERY IS BEING RE-OPTIMIZED UNEXP
   MF63548      LIC-DB-OTHER Internal Database Maintenance.
   MF63513      OSP-DB-OTHER-F/DBOPRELTABLEMISC-T/QQQOOODBOPX/5000 SELECT ST
   MF63470      LIC-DB-PERFM SMP and OLAP windowing Expressions
   MF63469      SLIC-DB-OTHER Internal Maintenance
   MF63452      LIC-DB-PERFM FETCH FIRST ROW query over partitioned table ru
   MF63451      LIC-DB-OTHER-PERFM Queries over partition tables with a non-
   MF63419      OSP-PAR-940XBASE HASH TABLE POPULATION IO COSTS ARE TOO LOW.
   MF63378      LIC-DB-OTHER MCH3203 F/T DbopAffinity/QQQOOODBOP complex OR
   MF63328      OSP-DB-OTHER-F/DBOPAFFINITY-T/QQQOOODBOP-MSGMCH3203 RUNNING
   MF63299      LIC-DB Internal Maintenance
   MF63280      LIC-DB-OTHER-PERM Improve query performance by removing extr
   MF63212      LIC-DB-OTHER Internal maintenance.
   MF63166      OSP-OTHER-PERFM OPNQRYF USE OF TEMPORARY INDEXES
   MF63157      OSP-OTHER-PERFM QUERY RE-OPTIMIZATIONS OCCURRING
   MF63118      LIC-DB-PERFM Long optimization time for OLAP and SMP queries
   MF63116      LIC-DB-MSGMCH3203 Correlated Union set expression
   MF63086      LIC-DB Internal Maintenance
   MF63068      LIC-DB-OTHER-INCORROUT SQLRPGLE USING XML FAILS WITH SQLSTAT
   MF62884      LIC-DB-PERFM Improve re-use of temporary results with Concur
   MF62863      LIC-DB-PERFM Index Merge Ordering
   MF62438      LIC-DB-OTHER-PERFM Improve query optimization for partitione
   MF62851      LIC-DB-PERFM Excessive optimization time when MQTs enabled
   MF62754      LIC-DB-OTHER-PERM Improve query performance by removing extr
   MF62713      LIC-DB-MSGMCH3203 DbopNOde-getComplicatedExprs__8DbopNodeCFR
   MF62667      SLIC-DB-MSGMCH3203 DbopAffinity During Partitioned Table Pro
   MF62644      OSP-OTHER-PERFM WORKLOAD CAPPING IN ENVIRONMENTS THAT USE DB
   MF62644      OSP-DB-OTHER-F/DBPMTRAP-T/QDBGETM-MSGMCH3203 MSGMCH3203 F/DB
   MF62634      LIC-DB Internal Maintenance
   MF62624      LIC-DB-OTHER Internal Database Maintenance.
   MF62622      LIC-DB-OTHER Internal database maintenance
   MF62489      LIC-DB-INCORROUT ORDER BY and Partitioned Table and RRN Prob
   MF62433      LIC-DB-OTHER Internal Database Maintenance.
   MF62372      LIC-DB-PERFM Not using EVI Only Access
   MF62369      LIC-DB-OTHER-PERFM IMPROVE PERFORMANCE OF COMPLEX SQL QUERIE
   MF62367      LIC-DB-OTHER record buffer not initialized with default valu
   MF62343      LIC-DB-OTHER Optimizer support for PERCENTILE_DISC and PERCE
   MF62304      LIC-DB-PERFM SMP support for OLAP queries
   MF62244      LIC-DB-OTHER Internal Maintenance
   MF62227      LIC-DB-MSGMCH3203-UNPRED Regression functions implemented wi
   MF62196      LIC-DB-OTHER-INCORROUT WRKQRY OUTPUT IS NOT IN THE SPECIFIED
   MF62118      LIC-DB-OTHER Optimizer support for PERCENTILE_CONT and PERCE
   MF62079      LIC-DB Internal Maintenance
   MF62056      LIC-DB-OTHER-T/QQQOOODBOP-MSGMCH3601 MSGMCH3601 T/QQQOOODBOP
   MF62056      F/DBOPEXPRVALMISC-MSGMCH3203 R720 MCH3203 T/QQQOOOUPCL F/DBO
   MF62041      LIC-DB-MSGMCH3203 Partitioned table query with SMP and LPG
   MF61958      LIC-DB-OTHER-F/DBPMFORMAT-T/QDBGETMQO-MSGMCH3402 MSGCPF5257
   MF61901      LIC-DB-OTHER Internal database maintenance
   MF61855      OSP-DB-OTHER-INCORROUT INCORRECT RESULTS MAY OCCUR WITH REPL
   MF61855      LIC-DB-OTHER-F/DBOPEXPRVALMISC-T/QQQOOODBOP-MSGMCH3203 FILE
   MF61843      OSP-DB-OTHER-MSGCPF4204 ON A QUERY OVER A VIEW
   MF61831      LIC-DB-PERFM Improve re-use of temporary results with Concur
   MF61825      LIC-DB-INCORROUT WHEN BOTH REGR_COUNT AND COUNT
   MF61788      OSP-DB-OTHER OUTPUT QRO HASH OF QUERY INITIATING MTI IN TRAC
   MF61693      LIC-DB-MSGMCH3203 OLAP Aggregate query
   MF61685      LIC-DB Internal Database Maintenance
   MF61672      LIC-DB-OTHER-INCORROUT Left outer join query returns wrong r
   MF61633      LIC-DB-OTHER-MSGMCH3203-F/DBOPAFFINITY-T/QQQOOODBOP followed
   MF61587      LIC-DB-PERFM bad plan when running commit *ALL
   MF61576      OSP-DB-OTHER-SAP400 INDEX ADVISER IS SETTING SORT TABLE TO *
   MF61571      OSP-PAR-940XMISC AFTER UPGRADE TO R720 POOR QUERY PERFORMANC
   MF61507      LIC-DB-PERFM SQL Improve column elimination in union queries
   MF61432      LIC-DB Internal Database Maintenance
   MF61332      LIC-DB Internal Maintenance
   MF61301      LIC-DB Offload long EKR estimates found during optimization
   MF61155      LIC-DB-PERFM - EAO with Partitioned Tables
   MF61155      LIC-DB-PERFM Partitioned Table Index preload IO cost too hig
   MF61149      LIC-PERFM-PAR-940XMISC Bad Query Plan
   MF61126      LIC-DB-OTHER-F/QDBSIGEX-MSGCPF5149 MAY OCCUR WHEN USING USIN
   MF60927      LIC-DB Plan Cache Property Number of created MTIs is zero
   MF60927      LIC-DB-INCORROUT SMP XML INCORRECT OUTPUT AFTER UPGRADE
   MF60927      LIC-DB-OTHER-INCORROUT SQL LOCATE with VARCHAR columns and t
   MF60927      LIC-DB-PERFM SQL Honor KEEPINMEM MEMORY_POOL_PREFERENCE for
   MF61255      OSP-DB-OTHER-F/DBPMTRAP-T/QQQOOODBOP-MSGMCH3203 VL0600BADD V
   MF61492      LIC-DB-OTHER Add key range estimate information to Visual Ex

Summary Information

System..............................  i
Models..............................  
Release.............................  V7R3M0
Licensed Program....................  5770999
APAR Fixed..........................  View details for APAR MA47900
Superseded by:......................  View fix details for PTF MF70707
Recompile...........................  N
Library.............................  QSYS
MRI Feature ........................  NONE
Cum Level...........................  C0128730


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Document Information

Modified date:
05 June 2023