DB2 FOR LUW / DB2FORLUW / 980 - DB2

Incorrect results may occur during the optimization of a Union 
All view (UA) that is used as a common sub-expression (CSE) and 
has predicate(s) applied on it. 
 
The conditions for such a scenario are: 
1) Query contains a UA (UA1) over another UA (UA2) and UA2 is 
used in both legs of UA1 (making it a CSE) 
2) The legs of UA2 are simple selects over base-tables (BT) 
3) The legs of UA2 have no predicates or simple equi-join or 
range-join local predicates 
4) Each BT used in UA2 has equi-join check constraints defined 
on it 
5) Either leg of UA1 has one or more <column> = ? predicate 
(PARAMPRD) 
6) The column referenced in PARAMPRD is an output column of UA2 
7) All column(s) referenced in PARAMPRD(s) source directly from 
BTs and have equi-join check constraints defined on them 
8) The parameter marker referenced in PARAMPRD is bound to a 
value VAL1. 
9) VAL1 is different from the check constraint value of the 
column from the largest BT under UA2 that is referenced in 
PARAMPRD

**************************************************************** 
* USERS AFFECTED:                                              * 
* Any using CSE with a union all                               * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description.                                       * 
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* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.8 Fix Pack 4                        * 
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Lower the query optimization class to a value less than 5. This 
can be done either by altering the CURRENT QUERY OPTIMIZATION 
special register or by altering the DFT_QUERYOPT database 
configuration parameter.

DB2 Version 9.8 Fix Pack 4 for AIX and Linux
 DB2 Version 9.8 Fix Pack 5 for AIX and Linux
 

Problem was first fixed in DB2 Version 9.8 Fix Pack 4

keiner bekannt / siehe Local-Fix

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

28.04.2010
04.08.2011
04.08.2011

9.8.FP4