|
Problem IC74013
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Status: Closed |
FILTER FACTOR OVERESTIMATION WHEN INLIST PREDICATE WITH MULTIPLE PARAMETER MARKERS AND THE COLUMN HAS MANY NULLS |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
We may overestimate the filter factor when we have an INLIST
predicate with multiple parameter markers/host variables and the
column has significant number of NULLs. This can lead to a
sub-optimal access plan. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users running queries with multiple parameter markers with *
* an inlist against a table with many nulls *
****************************************************************
* PROBLEM DESCRIPTION: *
* We may overestimate the filter factor when we have an INLIST *
* predicate with multiple parameter markers/host variables and *
* the column has significant number of NULLs. This can lead *
* to a sub-optimal access plan. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v9.7 FP5 or newer *
**************************************************************** |
| Local Fix: |
Contact DB2 Support |
| available fix packs: |
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 |
Upgrade to DB2 v9.7 FP5 or newer |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC74035
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 20.01.2011
21.12.2011
21.12.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP5
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
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