DB2 FOR LUW / DB2FORLUW / 950 - DB2

DB2 uses the individual column statistics to correct the 
cardinality estimate for predicates applied to columns in views 
enabled for optimization (statistical views, or statviews for 
short). When the predicate involves combinations of AND and OR 
predicates, the correction is not applied properly. 
 
For example, the statview column statistics would be used to 
estimate the filtering for predicates like: 
"column1 >= 7 and column1 <= 9", or 
"column1 = 7 or column1 = 9" 
 
However, it would not be used to estimate the filtering for 
predicates like: 
"column1 >= 7 and column1 <= 9 or 
 column1 >= 15 and column1 <= 18" 
 
This fix addresses the filtering estimate for the more complex 
predicate with predicates combined with OR and AND.

**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Problem Description above.                               * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version V9.5 Fix Pack 8.                      * 
****************************************************************

DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
 DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
 DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
 

First fixed in DB2 Version V9.5 Fix Pack 8.

keiner bekannt / siehe Local-Fix

Vorgänger  : APAR is sysrouted TO one or more of the following: IC70255 IC70256 
Nachfolger : 

Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:

28.07.2010
05.07.2011
05.07.2011

9.5.FP8