|
Problem IC71954
|
Status: Closed |
PERFORMANCE DEGRADATION DUE TO A PACKAGE CACHE CONTENTION WHEN MANY DROP DGTT STATEMENTS ARE RUNNING SIMULTANEOUSLY |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
Each time when we drop DGTT )Declared Global Temporary Table) in
application, we create a new environment entry for this
statement in the cache. Every new statements that are coming in
have to traverse through the list of environments, holding a
latch, making everybody else to wait.
SQLO_LT_sqlra_anchor_stmt__latch - the package cache dynamic SQL
anchor latch is one of the latch waiters. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All DB2 users on V9.5 FP7 and below *
****************************************************************
* PROBLEM DESCRIPTION: *
* Each time when we drop DGTT )Declared Global Temporary *
* Table) in application, we create a new environment entry for *
* this statement in the cache. Every new statements that are *
* coming in have to traverse through the list of environments, *
* holding a latch, making everybody else to wait. *
****************************************************************
* RECOMMENDATION: *
* Please upgrade to DB2 V9.5 FP8 where this APAR is first *
* fixed. *
**************************************************************** |
| Local Fix: |
(i) db2set DB2_APM_PERFORMANCE=1
(ii) Turn off statement monitor
(iii) db2 flush package cache dynamic |
| available fix packs: |
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
APAR first fixed in DB2 V9.5 FP8. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 15.10.2010
30.06.2011
30.06.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.5.FP8
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.5.0.8
|
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