|
Problem IT19868
|
Status: Closed |
DB2 MIGHT PRODUCE SUBOPTIMAL PLAN FOR DEEPLY NESTED NOT EXISTENTIAL SUBQUERIES |
| product: |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 |
| Problem description: |
Under rare scenarios, DB2 might produce a suboptimal plan if the
following conditions are true
1) The query contains 3 or more levels of nested sub-queries of
form NOT IN/ NOT EXISTS
2) The sub-queries have one or more correlated predicates |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Db2 10.5 Fix Pack 9 or higher *
**************************************************************** |
| Local Fix: |
|
| Solution |
First fixed in Db2 10.5 Fix Pack 9 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 24.03.2017
29.09.2017
29.09.2017 |
| Problem solved at the following versions (IBM BugInfos) |
9.0.
|
| Problem solved according to the fixlist(s) of the following version(s) |
