|
Problem IC97760
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Status: Closed |
QUERY PERFORMANCE ISSUE DUE TO STATISTICS PREVENTING PUSHDOWN OF JOINS |
| product: |
DB2 FOR LUW / DB2FORLUW / A50 - 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 V105 FP2 and lower *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Cancun Release 10.5.0.4 (also known as Fix *
* Pack 4) or higher. *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
DB2 Cancun Release 10.5.0.4 (also known as Fix Pack 4) for Linux, UNIX, and Windows
DB2 Version 10.5 Fix Pack 9 for Linux, UNIX, and Windows
|
| Solution |
Fixed in DB2 Cancun Release 10.5.0.4 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 19.11.2013
09.09.2014
25.09.2014 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.5.0.4
|
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