|
Problem IC65375
|
Status: Closed |
Explain from section shows incorrect estimated cardinality in DPF environments |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When a statement is explained using section information via
EXPLAIN_FROM_ACTIVITY, EXPLAIN_FROM_CATALOG, EXPLAIN_FROM_DATA,
or EXPLAIN_FROM_SECTION procedures in a Database Partitioning
Feature (DPF) environment, the explain output shows incorrect
estimated cardinality values. The estimated cardinalities are
presented as per-table values instead of per-database-partition
values. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* When a statement is explained using section information via *
* *
* EXPLAIN_FROM_ACTIVITY, EXPLAIN_FROM_CATALOG, *
* EXPLAIN_FROM_DATA, *
* or EXPLAIN_FROM_SECTION procedures in a Database *
* Partitioning *
* Feature (DPF) environment, the explain output shows *
* incorrect *
* estimated cardinality values. The estimated cardinalities *
* are *
* presented as per-table values instead of *
* per-database-partition *
* values. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Version 9.7 Fix Pack 2. *
**************************************************************** |
| Local Fix: |
To determine correct estimated cardinality values:
- obtain explain output via the DB2 explain facility (EXPLAIN
statement or CURRENT EXPLAIN MODE special register)
- continue to obtain explain output from section information and
manually adjust the per-table cardinality values to
per-database-partition values |
| available fix packs: |
DB2 Version 9.7 Fix Pack 2 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
Problem was first fixed in Version 9.7 Fix Pack 2. The fix is
to be applied to the database server. |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IZ69153
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 04.01.2010
08.04.2010
08.04.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP2
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.2
|
 |
