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DB2 - Problembeschreibung

Problem IC88758 Status: Geschlossen

REMOVE REDUNDANT SUBTERM PREDICATE FROM AN OR PREDICATE

Produkt:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problembeschreibung:
An OR(disjunct) predicate has multiple subterm predicates, 
called SP1, SP2, and so on. Each OR subterm predicate SP is 
either a simple predicate or multiple predicates combined with 
AND (conjunct). Given two subterm predicates, SPi and SPj, if 
SPi is identical to SPj or SPi is identical to any conjunct 
predicate under SPj, SPj has no filtering effect and will be 
removed from the parent OR predicate. 
 
As example: 
select * from table where  ( ( col1 = 1 ) or ( col1 = 2 ) ) or ( 
( col2 = 1 ) and ( col1 = 2 ) ) 
 
P1:  ( col1 = 1 ) or 
P2: ( col1 = 2 ) ) or 
P3: ( ( col2 = 1 ) and ( col1 = 2 )) 
 
Predicate P3 is redundant - it is true only if P2 is true, thus 
can be safely removed during query rewrite phase
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 9.7 Fixpak 8                                  * 
****************************************************************
Local-Fix:
verfügbare FixPacks:
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows

Lösung
First fixed in DB2 9.7 Fixpak 8
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC91303 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
30.11.2012
29.04.2013
29.04.2013
Problem behoben ab folgender Versionen (IBM BugInfos)
9.7.
Problem behoben lt. FixList in der Version
9.7.0.8 FixList