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DB2 - Problem description

Problem IC77326 Status: Closed

MERGE QUERY REWRITE RULE ENHANCEMENT

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
This enhancement changes MERGE statement with only MATCHED 
condition.  When source table rows are updated and/or inserted 
into target table via MERGE statement, DB2 used to do "<source 
table> left outer join <target table>" and it can be observed in 
the explain plan. If the MERGE statement has only one matching 
condition and that condition is "MATCHED", this enhancement will 
change that join to "<source table> inner join <target table>".
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* This enhancement changes MERGE statement with only MATCHED   * 
* condition.  When source table rows are updated and/or        * 
* inserted                                                     * 
* into target table via MERGE statement, DB2 used to do        * 
* "<source table> left outer join <target table>" and it can   * 
* be observed in                                               * 
* the explain plan. If the MERGE statement has only one        * 
* matching condition and that condition is "MATCHED", this     * 
* enhancement will                                             * 
* change that join to "<source table> inner join <target       * 
* table>".                                                     * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 V9.7 FP6                                      * 
****************************************************************
Local Fix:
n/a
available fix packs:
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

Solution
First fixed in DB2 9.7 FP 6
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
05.07.2011
13.11.2012
13.11.2012
Problem solved at the following versions (IBM BugInfos)
9.7.FP6
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.6 FixList
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