|
Problem IC78522
|
Status: Closed |
STMM TUNES SHARED SORT MEMORY TOO HIGH |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
STMM may tune shared sort memory too high when throttling has
occured as part of trying to satisfy STMM's "Minimum Size"
calculation.
The best way to be sure of this symptom is when the "Minimum
Size" for Shared Sort Heap in the STMM log is more than 1.25
times the current or peak shared sort memory usage (seen in a
database snapshot).
For example, below the Minimum Size is 5288250, but the database
snapshot shows a high water mark of only 3882760. The Minimum
Size is more than 1.25 x the high water mark, which is too high,
and likely caused by this APAR.
*** stmmCostBenefitRecord ***
Type: SHEAPTHRES_SHR
PageSize: 4096
...
Current Size: 4363267 (this is the current configured size)
Minimum Size: 5288250
Database Snapshot:
Total Shared Sort heap allocated = 3138402
Shared Sort heap high water mark = 3882760 |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* DB2 with STMM tuning overall sort memory ( SHEAPTHRES_SHR) *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 9.7 Fix Pack 6 *
**************************************************************** |
| Local Fix: |
Use a fixed size for SHEAPTHRES_SHR |
| available fix packs: |
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 |
Problem first fixed in DB2 Version 9.7 Fix Pack 6 |
| Workaround |
See Local Fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC78769
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 06.09.2011
12.06.2012
12.06.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.6
|
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