|
Problem IC74076
|
Status: Closed |
INCORRECT FILTER FACTOR CALCULATION FOR SYSIBM.DAYNAME AND SYSIBM.MONTHNAME FUNCTIONS |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
The optimizer incorrectly estimates the filter factor of
predicates that reference the SYSIBM.DAYNAME or SYSIBM.MONTHNAME
function. This might lead to the optimizer choosing a
non-optimal query execution plan. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* The optimizer incorrectly estimates the filter factor of *
* *
* predicates that reference the SYSIBM.DAYNAME or *
* SYSIBM.MONTHNAME *
* function. This might lead to the optimizer choosing a *
* *
* non-optimal query execution plan. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 9.7 Fix Pack 4. *
**************************************************************** |
| Local Fix: |
Use SYSFUN.DAYNAME and SYSFUN.MONTHNAME in place of
SYSIBM.DAYNAME and SYSIBM.MONTHNAME respectively. |
| available fix packs: |
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 8 for Linux, UNIX, and Windows
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 |
This is first fixed in DB2 Version 9.7 Fix Pack 4. |
| Workaround |
See Local Fix. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 24.01.2011
28.04.2011
28.04.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP4
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.4
|
 |
