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DB2 - Problembeschreibung

Problem IC72530 Status: Geschlossen

POOR PERFORMANCE WHEN LIKE PREDICATE HAS MIXED GRAPHIC AND NON-GRAPHIC
ARGUMENTS

Produkt:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problembeschreibung:
A LIKE predicate with an escape-expression does not use an 
available index when the match-expression is a GRAPHIC or 
VARGRAPHIC column, and both the pattern-expression and 
escape-expression are CHAR or VARCHAR type.  For example: 
 
   ... WHERE graphiccol LIKE 'abc!_%' ESCAPE '!' 
 
Any index on column graphiccol will not be exploited possibly 
resulting in poor query performance.  This only applies to a 
unicode database, since mixing of graphic and non-graphic types 
is not allowed otherwise.
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* A LIKE predicate with an escape-expression does not use an   * 
* available index when the match-expression is a GRAPHIC or    * 
* VARGRAPHIC column, and both the pattern-expression and       * 
* escape-expression are CHAR or VARCHAR type.  For example:    * 
*                                                              * 
*                                                              * 
*                                                              * 
* ... WHERE graphiccol LIKE 'abc!_%' ESCAPE '!'                * 
*                                                              * 
*                                                              * 
*                                                              * 
* Any index on column graphiccol will not be exploited         * 
* possibly resulting in poor query performance.  This only     * 
* applies to a unicode database, since mixing of graphic and   * 
* non-graphic types is not allowed otherwise.                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.5 and Fix Pack 8                    * 
****************************************************************
Local-Fix:
Cast the pattern-expression and/or escape-expression to graphic 
type.  For constants, a G prefix can be added: 
 
   ... WHERE graphiccol LIKE G'abc!_%' ESCAPE G'!'
verfügbare FixPacks:
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Lösung
Problem was first fixed in DB2 Version 9.5 and Fix Pack 8
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC72599 IC72600 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
11.11.2010
27.06.2011
27.06.2011
Problem behoben ab folgender Versionen (IBM BugInfos)
9.5.
Problem behoben lt. FixList in der Version
9.5.0.8 FixList