|
Problem IC75648
|
Status: Closed |
CACHED QUERY MAY GET RE-COMPILED WITH EVERY EXECUTION IF METHOD IS REFERENCED |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When you run a query repeatedly on behalf of an user holding
DBADM authority, query gets compiled only once and the package
is reused each time the same query gets executed. If a non-DBADM
user executes the same query periodically, the cache entry will
be ignored and re-compiles the query again.
For example, consider the excerpts taken from statement
snapshots generated for DBADM, and non-DBADM query executions:
DBADM:
Number of executions = 5
Number of compilations = 1
Non-DBADM:
Number of executions = 5
Number of compilations = 5
The value of "Number of compilations" above for both cases
shows whether the same query was compiled on each execution or
only once. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users running DB2 v9.7 FP4 and earlier. *
****************************************************************
* PROBLEM DESCRIPTION: *
* When you run a query repeatedly on behalf of an user holding *
* *
* DBADM authority, query gets compiled only once and the *
* package *
* is reused each time the same query gets executed. If a *
* non-DBADM *
* user executes the same query periodically, the cache entry *
* will *
* be ignored and re-compiles the query again. *
* *
* *
* *
* For example, consider the excerpts taken from statement *
* *
* snapshots generated for DBADM, and non-DBADM query *
* executions: *
* *
* *
* DBADM: *
* *
* Number of executions = 5 *
* Number of compilations = 1 *
* *
* *
* Non-DBADM: *
* *
* Number of executions = 5 *
* Number of compilations = 5 *
* *
* *
* The value of "Number of compilations" above for both cases *
* *
* shows whether the same query was compiled on each execution *
* or *
* only once. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v9.7 FP5. *
**************************************************************** |
| Local Fix: |
|
| 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 |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 07.04.2011
19.12.2011
19.12.2011 |
| 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
|
 |
