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DB2 - Problembeschreibung

Problem IC68255 Status: Geschlossen

LONG COMPILE TIME FOR QUERIES INVOLVING NULL TOLERANT JOIN PREDICATES.

Produkt:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problembeschreibung:
You might experience long compile time for queries 
involving one or more null tolerant join predicates. 
 
This type of predicate is in the form of 
 
T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL)
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* You might experience long compile time for queries           * 
*                                                              * 
* involving one or more null tolerant join predicates.         * 
*                                                              * 
* This type of predicate is in the form of                     * 
*                                                              * 
*                                                              * 
*                                                              * 
* T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL)                 * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 9.7 Fix Pack 3 and set                * 
* DB2_REDUCED_OPTIMIZATION=NOSORT_NEQN to enable a reduced     * 
* optimization strategy targeted to null tolerant join         * 
* predicates.                                                  * 
****************************************************************
Local-Fix:
Reducing the query optimization level might reduce the compile 
time.
verfügbare FixPacks:
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
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
The problem was first fixed in Version 9.7 Fix Pack 3.
Workaround
keiner bekannt / siehe Local-Fix
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
28.04.2010
20.09.2010
20.09.2010
Problem behoben ab folgender Versionen (IBM BugInfos)
9.7.FP3
Problem behoben lt. FixList in der Version
9.7.0.3 FixList
9.7.0.3 FixList