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DB2 - Problem description

Problem IC75324 Status: Closed

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

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
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 9.7 Fix Pack 2.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* SMALL DECLARED TEMPORARY TABLES IN DPF MIGHT HAVE POOR QUERY * 
* ACCESS PLAN                                                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 9.7 Fixpack 5.                        * 
****************************************************************
Local Fix:
Use a single dbpartition tablespace for small declared temporary 
tables.
available fix packs:
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

Solution
First fixed in DB2 version 9.7 Fixpack 5.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC78217 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
28.03.2011
09.01.2012
09.01.2012
Problem solved at the following versions (IBM BugInfos)
9.7.FP5
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.5 FixList