|
Problem IT18428
|
Status: Closed |
DB2 POOR PERFORMANCE IN UPDATE QUERY HAVING CORRELATION |
| product: |
DB2 FOR LUW / DB2FORLUW / B10 - DB2 |
| Problem description: |
DB2 query performance may degrade if the following conditions
are satisfied:
1. This is a an UPDATE query that has a scalar subquery (e.g.
EXISTS) on multiple tables
2. Scalar subquery has correlated predicate(s) on the table to
update
3. There is/are index/indices on the columns of the correlated
predicate |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All DB2 LUW Users *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Update to DB2 LUW 11.1.3.3 or later *
**************************************************************** |
| Local Fix: |
Change the query to run at Optimization Level 1 |
| available fix packs: |
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
|
| Solution |
First fixed in DB2 LUW 11.1.3.3 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 15.12.2016
15.03.2018
15.03.2018 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
