DB2 - Problembeschreibung
Problem IC79382 | Status: Geschlossen |
DB2 SQL QUERY COMPILER HAS IMPROVED THE PERFORMANCE OF SECONDARY TABLE ACCESSES DURING INCREMENTAL MQT MAINTENANCE IN DPF | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 | |
Problembeschreibung: | |
DB2 SQL Query Compiler has improved the performance of secondary table access for incremental maintenance of a materialized query table (MQT) when all of the following conditions are satisfied: (1) it is a partitioned (DPF) environment (2) the MQT is a refresh immediate MQT or a staging table. The MQT definition involves a join between more than one base table (for example, T1 and T2) (3) the SQL statement S1 being compiled is an INSERT/UPDATE/DELETE statement that fires a trigger (Trig1). The body of the trigger modifies one of the base tables (say, T1) of the MQT. (4) In the incremental MQT maintenance section of the access plan, if the join predicate between T2 and the modified rows of T1 could be reduced to a local predicate (i.e. a predicate that references only T2). The reduction of the join predicate to a local predicate may occur when the statement being compiled (S1) or the trigger (Trig1) has specified a constant or parameter marker for the join column of T1. When all of the conditions above are satisfied, the evaluation of the local predicate on T2 during incremental maintenance of MQT will be pushed down for a more efficient access. | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * DPF customers * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 version 9.7 Fix Pack 6 * **************************************************************** | |
Local-Fix: | |
verfügbare FixPacks: | |
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows | |
Lösung | |
This APAR is fixed in DB2 version 9.7 Fix Pack 6. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Bug-Verfolgung | |
Vorgänger : APAR is sysrouted TO one or more of the following: IC84217 Nachfolger : | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 21.10.2011 12.06.2012 12.06.2012 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.7.FP6 | |
Problem behoben lt. FixList in der Version | |
9.7.0.6 |