DB2 - Problem description
Problem IC81516 | Status: Closed |
A FULL SCAN OF AN MDC TABLE MIGHT BE CHOSEN WHEN THERE IS A LARGE NUMBER OF | |
product: | |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 | |
Problem description: | |
The optimizer might favor a full scan of a multidimensional clustering (MDC) table when there are a large number of overflow records present in the table. Poor performance will be noticed and the explain of the query shows a full scan of the MDC table. | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * A FULL SCAN OF AN MDC TABLE MIGHT BE CHOSEN WHEN THERE IS A * * LARGE NUMBER OF OVERFLOW RECORDS. * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 9.7 Fix Pack 6. * **************************************************************** | |
Local Fix: | |
A reorg of the table in question will remove the overflow records and problem can be circumvented once statistics are collected after the reorg is performed. | |
available fix packs: | |
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows | |
Solution | |
First fixed in DB2 Version 9.7 Fix Pack 6. | |
Workaround | |
not known / see Local fix | |
BUG-Tracking | |
forerunner : APAR is sysrouted TO one or more of the following: IC84457 follow-up : | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 17.02.2012 05.06.2012 05.06.2012 |
Problem solved at the following versions (IBM BugInfos) | |
9.7.FP6 | |
Problem solved according to the fixlist(s) of the following version(s) | |
9.7.0.6 |