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DB2 - Problembeschreibung

Problem IC98655 Status: Geschlossen

SUBQUERIES REFERENCING AN ALWAYS FALSE PREDICATE MIGHT NOTICE BAD
PERFORMANCE

Produkt:
DB2 FOR LUW / DB2FORLUW / A10 - DB2
Problembeschreibung:
Under rare scenarios, a query executing on DB2 might take a long 
time if the following conditions are true: 
1) The query contains one or more subqueries of the type NOT 
EXISTS/NOT IN. 
2) The subqueries contains predicates which can be proven to be 
ALWAYS FALSE and 
produce an empty result set. 
 
eg. Select * from T1 
       Where Not Exists (select * from T2 
                                      where T1.c1 = T2.c1 and 
1=0)
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 10.1 fixpack 4                        * 
****************************************************************
Local-Fix:
Workaround: 
1) Manually rewrite the query to remove the subquery 
2) db2set -im DB2_ANTIJOIN=NO
verfügbare FixPacks:
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows

Lösung
Upgrade to DB2 version 10.1 fixpack 4
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC98750 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
09.01.2014
02.06.2014
02.06.2014
Problem behoben ab folgender Versionen (IBM BugInfos)
Problem behoben lt. FixList in der Version
10.1.0.4 FixList