DB2 FOR LUW / DB2FORLUW / 970 - DB2

Equality join predicates may be pushed down thru an OLAP 
function. The columns in the join predicates are required to be 
a superset of a unique index (or a primary key). The join 
predicates then will form a correlation, resulting in limiting 
the only join method eligible be the NLJOIN. This could cause a 
performance degradation. 
 
An indicator that a user has hit this problem is to look at the 
Optimized Statement of the db2exfmt output. 
 
   (SELECT ..., <func>(<col> OVER (PARTITION NY <col>,...), ... 
    FROM  Q#3, ... 
    WHERE Q#3.<col> = Q#2.<col> 
    ) AS Q#1, 
    <table> AS Q#2, ... 
 
If a correlated join predicate such as Q#3.<col> = Q#2.<col> is 
seen and self-join of the base table with unique key as: 
 
               FROM K.R46C AS Q3, K.R05C AS Q4, 
                       K.R05C AS Q5, K.R41C AS Q6, 
                       K.R01C AS Q7, 
 
the Q4 and Q5 are quantifiers over the same base table. 
This SQL statement may hit this problem.

**************************************************************** 
* USERS AFFECTED:                                              * 
* DB2 UDB Version 9.7                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to Version 9.7 FixPack 7.                            * 
****************************************************************

DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
 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
 

Problem was first fixed in DB2 UDB Version 9.7 FixPack 7.

keiner bekannt / siehe Local-Fix

Vorgänger  : APAR is sysrouted TO one or more of the following: IC88353 
Nachfolger : 

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

03.07.2012
23.10.2012
23.10.2012

9.7.FP7