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DB2 - Problem description

Problem IC85858 Status: Closed

INCONSISTENCY IN FILTER FACTOR CALCULATION FOR RANGE PREDICATES VALUES THAT
ARE BEYOND THE LAST HISTOGRAM

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
When range predicate literal values are beyond the highest 
quantile value, filter factor calculation may be incorrect. 
 
For example, suppose the highest quantile value for the column 
DATE is '2012-07-25'. Range predicates (DATE >= '2012-07-25' and 
DATE < '2012-07-26') can result in a combined FF of almost 0 
rather than the FF of the equality predicate DATE = 
'2012-07-25'.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to v9.7 Fix Pack 8                                    * 
****************************************************************
Local Fix:
Use an equality predicate if it is logically equivalent to a set 
of range predicates
available fix packs:
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 v9.7 Fix Pack 8
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC85887 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
13.08.2012
15.04.2013
15.04.2013
Problem solved at the following versions (IBM BugInfos)
9.7.FP8
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.8 FixList
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