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DB2 - Problembeschreibung

Problem IC90465 Status: Geschlossen

PERFORMANCE DEGRADATION MIGHT BE NOTICED WITH NOT EXISTS SUBQUERY WITH
MULTIPLE TABLES.

Produkt:
DB2 FOR LUW / DB2FORLUW / A10 - DB2
Problembeschreibung:
Under some scenarios, DB2 might choose a suboptimal plan if the 
following conditions are true: 
1. The query has a not exists subquery 
2. The subquery contains 2 or more base tables 
3. The correlated join predicate in the subquery has an index on 
the join column.
Problem-Zusammenfassung:
Under some scenarios, DB2 might choose a suboptimal plan if the 
following conditions are true: 
1. The query has a not exists subquery 
2. The subquery contains 2 or more base tables 
3. The correlated join predicate in the subquery has an index on 
the join column.
Local-Fix:
Disable AntiJoin by either : 
1>  db2set DB2_ANTIJOIN=NO -im 
2>  set up an optimization guideline to disable the antijoin for 
this specific query only.
verfügbare FixPacks:
DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows

Lösung
First fixed in DB2 Version 10.1 Fix Pack 3.
Workaround
Disable AntiJoin by either : 
1>  db2set DB2_ANTIJOIN=NO -im 
2>  set up an optimization guideline to disable the antijoin for 
this specific query only.
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC95335 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
25.02.2013
06.05.2014
06.05.2014
Problem behoben ab folgender Versionen (IBM BugInfos)
Problem behoben lt. FixList in der Version
10.1.0.3 FixList
10.1.0.3 FixList
10.1.0.4 FixList