DB2 - Problem description
Problem IT35231 | Status: Closed |
ONE COMPLEX QUERY TAKES VERY LONG TIME TO FINISH AFTER MIGRATINGFROM V10.5 | |
product: | |
DB2 FOR LUW / DB2FORLUW / B10 - DB2 | |
Problem description: | |
Customer reported a severe performance issue for one query in their workload after migrating from v10.5 to v11.1. Investigation found that query with very wide grouping key (in this case it's 29-words long) may expose one hash function implementation limitation which causes bad collision and lead to poor query performance. | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * all users * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * upgrade to Db2 111m4fp6 or higher * **************************************************************** | |
Local Fix: | |
N/A | |
Solution | |
Workaround | |
**************************************************************** * USERS AFFECTED: * * all users * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * upgrade to Db2 111m4fp6 or higher * **************************************************************** | |
Comment | |
upgrade to 111m4fp6 or higher | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 10.12.2020 12.03.2021 12.03.2021 |
Problem solved at the following versions (IBM BugInfos) | |
Problem solved according to the fixlist(s) of the following version(s) |