DB2 - Problembeschreibung
Problem IC91751 | Status: Geschlossen |
OPTIMIZER MIGHT CHOOSE NON-OPTIMAL JOIN IN PRESENCE OF CYCLES WHEN DB2_REDUCED_OPTIMIZATION=JOIN IS SET | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 | |
Problembeschreibung: | |
When the DB2_REDUCED_OPTIMIZATION registry variable setting includes the JOIN value, the optimizer might choose a non-optimal join order or join alternative, such as a hash join over a nested loop join, for star join eligible queries that include join cycles. This is more likely to occur in Version 10.1 Fix Pack 2. | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * Environments with DB2_REDUCED_OPTIMIZATION registry variable * * setting that includes the JOIN value is affected. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 10.1 Fix Pack 3. * **************************************************************** | |
Local-Fix: | |
verfügbare FixPacks: | |
DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows | |
Lösung | |
Problem fixed in DB2 Version 10.1 Fix Pack 3. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 22.04.2013 17.10.2013 17.10.2013 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
Problem behoben lt. FixList in der Version | |
10.1.0.3 | |
10.1.0.3 |