DB2 FOR LUW / DB2FORLUW / 970 - DB2

A complex SQL statement, requiring repartitioned joins in a DPF 
system, might produce wrong results if the following conditions 
are met: 
 
- The SQL statement includes two or more joins that are not 
collocated 
- At least one of the joins chosen by the optimizer is a 
repartitioned join, identifiable by the presence of a TQ 
operator somewhere below both inputs to the join 
- The join columns are of short-string type (CHAR, VARCHAR) with 
differing lengths. 
 
Note that the presence of these conditions does not always lead 
to incorrect results.

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* USERS AFFECTED:                                              * 
* Database partitioning feature                                * 
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* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
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* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 9.7.0.11.                             * 
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You can attempt to avoid the repartition join by creating one or 
more materialized query tables (MQT) on each table referenced in 
the join, where the MQT is defined with a hash distribution key 
on the join columns.

The problem was first fixed in DB2 version 9.7.0.11.

See Local Fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

05.09.2014
08.10.2015
08.10.2015

9.7.0.11