DB2 - Problembeschreibung
Problem IC89364 | Status: Geschlossen |
OPTIMIZER MIGHT CHOOSE NON-OPTIMAL JOIN IN PRESENCE OF CYCLES WHEN DB2_REDUCED_OPTIMIZATION=JOIN IS SET | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 970 - 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 9.7 Fix Pack 7. | |
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 9.7 Fix Pack 8. * **************************************************************** | |
Local-Fix: | |
verfügbare FixPacks: | |
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows | |
Lösung | |
Problem first fixed in DB2 Version 9.7 Fix Pack 8. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Bug-Verfolgung | |
Vorgänger : APAR is sysrouted TO one or more of the following: IC91751 IC93698 Nachfolger : | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 03.01.2013 01.04.2013 01.04.2013 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.7.FP8 | |
Problem behoben lt. FixList in der Version | |
9.7.0.8 |