DB2 - Problembeschreibung
Problem IC68255 | Status: Geschlossen |
LONG COMPILE TIME FOR QUERIES INVOLVING NULL TOLERANT JOIN PREDICATES. | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 | |
Problembeschreibung: | |
You might experience long compile time for queries involving one or more null tolerant join predicates. This type of predicate is in the form of T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL) | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * You might experience long compile time for queries * * * * involving one or more null tolerant join predicates. * * * * This type of predicate is in the form of * * * * * * * * T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL) * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 version 9.7 Fix Pack 3 and set * * DB2_REDUCED_OPTIMIZATION=NOSORT_NEQN to enable a reduced * * optimization strategy targeted to null tolerant join * * predicates. * **************************************************************** | |
Local-Fix: | |
Reducing the query optimization level might reduce the compile time. | |
verfügbare FixPacks: | |
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows | |
Lösung | |
The problem was first fixed in Version 9.7 Fix Pack 3. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 28.04.2010 20.09.2010 20.09.2010 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.7.FP3 | |
Problem behoben lt. FixList in der Version | |
9.7.0.3 | |
9.7.0.3 |