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DB2 - Problem description

Problem IC78403 Status: Closed

DB2 OPTIMIZER CAN CHOOSE A SUB-OPTIMAL PLAN FOR A TABLE THAT HAS A HIGH
ROWS-PER-PAGE NUMBER

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
When a table has a high rows-per-page number, DB2 optimizer can 
be too conservative with the estimate and as a result, 
prefetching may not occur for a IXSCAN-FETCH operation on such a 
table, even when the index has a high cluster ratio. This can 
result in a sub-optimal query plan.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Problem Description above.                               * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.1 Fix Pack 11.                      * 
****************************************************************
Local Fix:
available fix packs:
DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows

Solution
First Fixed in Version 9.1 Fix Pack 11.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC78430 IC78431 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
30.08.2011
23.12.2011
23.12.2011
Problem solved at the following versions (IBM BugInfos)
9.1.FP11
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.11 FixList
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