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DB2 - Problembeschreibung

Problem IC65506 Status: Geschlossen

DB2 Query-Rewrite may result in expensive repetitions of an expression

Produkt:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problembeschreibung:
The query-rewrite phase of DB2 query compiler may replicate an 
expression multiple times. DB2 has a registry controlled 
facility to avoid this replication, if the execution cost of 
replicated expression is very high. 
 
This fix will improve the existing facility by defining a more 
granular threshold and comparing the total cost for all 
expressions against the threshold.
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* The query-rewrite phase of DB2 query compiler may            * 
* replicatean expression multiple times. DB2 has a registry    * 
* controlledfacility to avoid this replication, if the         * 
* execution cost ofreplicated expression is very high.This fix * 
* will improve the existing facility by defining amore         * 
* granular threshold and comparing the total cost for          * 
* allexpressions against the threshold.                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to Version 9.5 Fix Pack 6 or later releasecontaining * 
* the fix.                                                     * 
****************************************************************
Local-Fix:
verfügbare FixPacks:
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Lösung
Problem was first fixed in Version 9.5 Fix Pack 6.
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC66078 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
11.01.2010
31.05.2010
31.05.2010
Problem behoben ab folgender Versionen (IBM BugInfos)
9.5.FP6
Problem behoben lt. FixList in der Version