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DB2 - Problem description

Problem IT00521 Status: Closed

INCORRECT RESULT CAN BE RETURNED FOR COLUMN-ORGANIZED TABLES

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
The problem occurs when selecting from a column-organized if the 
DB2 optimizer chooses a plan that includes an MSJN (merge-sort 
join) operator. The results might be that not all of the 
qualifying rows are returned.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 10.5.0.4.                             * 
****************************************************************
Local Fix:
Execute the following and then recycle the DB2 instance: 
db2set DB2_REDUCED_OPTIMIZATION=NO_SORT_MGJOIN 
 
Note that with this workaround performance might be severely 
impacted.
Solution
The problem is first fixed in DB2 version 10.5.0.4.
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

24.03.2014
08.09.2014
07.04.2015
Problem solved at the following versions (IBM BugInfos)


Problem solved according to the fixlist(s) of the following version(s)


10.5.0.4

FixList