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DB2 - Problembeschreibung

Problem IC78217 Status: Geschlossen

SMALL DECLARED TEMPORARY TABLES IN DPF MIGHT HAVE POOR QUERY ACCESS PLAN

Produkt:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problembeschreibung:
In a DPF environment, when a declared temporary table is created 
into a multi-dbpartition tablespace, data skew might lead to a 
situation where some dbpartitions do not have data. This 
situation is more likely to occur when the table is small.  If 
statistics collection is performed from a dbpartition with no 
data, the query optimizer will plan the query based on the table 
being empty, which might lead to a poor access plan. 
 
This problem was first introduced in DB2 Version 9.5 Fix Pack 6.
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* SMALL DECLARED TEMPORARY TABLES IN DPF MIGHT HAVE POOR QUERY * 
* ACCESS PLAN                                                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.5 Fix Pack 9.                       * 
****************************************************************
Local-Fix:
Use a single dbpartition tablespace for small declared temporary 
tables.
verfügbare FixPacks:
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
First fixed in DB2 version 9.5 Fixpack 9.
Workaround
keiner bekannt / siehe Local-Fix
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
18.08.2011
10.04.2012
10.04.2012
Problem behoben ab folgender Versionen (IBM BugInfos)
9.5.FP9
Problem behoben lt. FixList in der Version
9.5.0.9 FixList