|
Problem IT18870
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Status: Closed |
POOR PERFORMANCE IN QUERY HAVING IN SUBQUERY AND JOINS
|
| product: |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 |
| Problem description: |
DB2 might depict performance degradation when the following
conditions are met:
- The query has IN subquery
- There are multiple INNER and OUTER joins
- The IN predicate is on a table participating in the JOINS
- The IN subquery is on a base table |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* See Error Description *
**************************************************************** |
| Local Fix: |
Use optimization level 1 using
1. set current query optimization level 1
or
2. using optguidelines:
query /*
*/ ; |
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 17.01.2017
31.08.2018
31.08.2018 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
