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DB2 - Problem description

Problem IC78430 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 / 950 - 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 users.                                                   * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See above.                                                   * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to version 9.5 Fix Pack 9 or later.                  * 
****************************************************************
Local Fix:
available fix packs:
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem was first fixed in Version 9.5 Fix Pack 9.
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
31.08.2011
13.03.2012
13.03.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.9 FixList
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