|
Problem IC83902
|
Status: Closed |
QUERY PERFORMANCE ISSUE DUE TO STATISTICS PREVENTING PUSHDOWN OF JOINS |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
Query containing UNION ALL join, may perform badly due to
statistics which prevent the push down of joins.
This is a costing issue. The push-down makes progress only when
query rewrite thinks the estimated join cardinality is not more
than the outer LEFT OUTER JOIN. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users on DB2 V97 FP8 and earlier *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 V97 FP9 *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
First Fixed in DB2 V97 FP9 |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC97757 IC97760
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 01.06.2012
17.12.2013
17.12.2013 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP9
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.9
|
 |
| 9.7.0.9
|
|
