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DB2 - Problem description

Problem IC73249 Status: Closed

Joining to a VALUES clause may result in suboptimal plans.

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
Using a JOIN between a VALUES clause and a table or sub-select 
might result in suboptimal query plans. If the VALUES clause 
contains multiple columns, the optimizer might not choose the 
best join method for satisfying the JOIN if the VALUES clause 
joins to multiple tables with a common local equality predicate 
as in the following example: 
 
 
SELECT ... FROM table(values(?,?),(?,?),(?,?),(?,?)) as a(a1, 
a2), b, c, d WHERE a.a1=b.b1 and a.a2=b.b2 and a.a1=c.c1 and 
a.a2=c.c2 and  a.a1=d.d1 and a.a2=d.d2 and a.a3 = ? and 
b.b3=a.a3 and c.c3=a.a3
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All DB2 users                                                * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* Using a JOIN between a VALUES clause and a table or          * 
* sub-select  might result in suboptimal query plans.          * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 9.7 Fix pack 5 or later                       * 
****************************************************************
Local Fix:
Use an IN predicate instead of a JOIN to a VALUES clause
available fix packs:
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
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
Upgrade to a Fix Pack containing the Fix
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
13.12.2010
19.12.2011
19.12.2011
Problem solved at the following versions (IBM BugInfos)
9.7.FP5
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.5 FixList
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