|
Problem IC63177
|
Status: Closed |
PACKAGE CACHE PERFORMANCE DEGRADES WHEN STATEMENT CONCENTRATOR TURNED ON |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When using the statement concentrator feature (most typically
with the database config parm STMT_CONC=LITERALS), performance
can degrade.
Some symptoms may include "Package Cache Overflow" messages in
the db2diag.log.
db2pd -db <dbname> -dynamic will also show an increasing number
of statement entries and a decreasing number of variation
entries in the dynamic SQL cache.
The performance degradation may be cyclic as periodically extra
statement entries in the cache are removed. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All configurations where STMT_CONC=literals is specified as *
* a db config parm *
****************************************************************
* PROBLEM DESCRIPTION: *
* Performance degradation when using the statement *
* concentrator feature. *
****************************************************************
* RECOMMENDATION: *
* move to Version 9.7, fixpack 1 or avoid using *
* stmt_conc=literals *
**************************************************************** |
| Local Fix: |
avoid using the statement concentrator feature (update db config
using stmt_conc off) |
| available fix packs: |
DB2 Version 9.7 Fix Pack 1 for Linux, UNIX, and Windows
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 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 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 |
Version 9.7, fixpack 1 will contain the fix. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 14.09.2009
04.01.2010
04.01.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP1
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.1
|
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