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DB2 - Problem description

Problem IC94337 Status: Closed

QUERY ON VARCHAR2 ENABLED DATABASE NO LONGER USES INDEX SCAN AFTER UPGRADE
TO FIX PACKS 5 TO 8

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
A query that may have been perfoming well prior to DB2 version 
9.7 fix pack 5 may stop choosing an index after upgrading to DB2 
version 9.7 fix packs 5 to 8.  This can happen on a VARCHAR2 
enabled database when the query includes basic predicates 
involving VARCHAR columns.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Users on version 9.7 fix packs 5 to 8                        * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 9.7 fix pack 9                        * 
****************************************************************
Local Fix:
Use optimization guidelines to use the appropriate index, for 
example: 
 
SELECT... /* <OPTGUIDELINES> 
           <IXSCAN TABLE="A" INDEX="MYINDEX"/> 
     </OPTGUIDELINES> */
available fix packs:
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 fix pack 9
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC96232 IC96236 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
23.07.2013
02.01.2014
02.01.2014
Problem solved at the following versions (IBM BugInfos)
9.7.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.9 FixList
9.7.0.9 FixList