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, 
this SQL statement may hit this problem.

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* USERS AFFECTED:                                              * 
* DB2 UDB Version 9.7                                          * 
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* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
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* RECOMMENDATION:                                              * 
* Upgrade to Version 9.7 FixPack 6.                            * 
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DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
 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 6.

keiner bekannt / siehe Local-Fix

Vorgänger  : APAR is sysrouted TO one or more of the following: IC84454 
Nachfolger : 

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

23.02.2012
06.06.2012
06.06.2012

9.7.FP6