DB2 - Problembeschreibung
Problem IT10763 | Status: Geschlossen |
DB2 SHOULD ELIMINATE REDUNDANT CORRELATED PREDICATES (SINGLE-LEVEL) | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 | |
Problembeschreibung: | |
DB2 should remove single-level correlation of redundant predicates within queries. Example: SELECT t1.c1 FROM t1 WHERE t1.c1 IS NULL AND EXISTS (SELECT 1 FROM t2 WHERE t1.c1 IS NULL) This query has a redundant correlated predicate (t1.c1 IS NULL). DB2 should eliminate the duplicate predicate as follows: SELECT t1.c1 FROM t1 WHERE t1.c1 IS NULL AND EXISTS (SELECT 1 FROM t2) | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Update to DB2 Version 10.5 Fix Pack 7. * **************************************************************** | |
Local-Fix: | |
Avoid writing queries containing redundant correlated predicates. | |
Lösung | |
This problem is first fixed in DB2 Version 10.5 Fix Pack 7. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 18.08.2015 20.01.2016 20.01.2016 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
Problem behoben lt. FixList in der Version | |
10.5.0.7 |