Fixes are available
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 7 for Linux, UNIX, and Windows
APAR status
Closed as program error.
Error description
On Windows, allocating memory may be significantly slower for databases with larger memory footprints ( many GBs ). Because DB2's memory allocations on Windows are typically small and incremental, coalesce checks end up being performed on a very large number of OS allocations. Activities which are intense in terms of allocating memory (such as bufferpool activation, creation, or increase, or initializing LOAD operations), may suffer some degradation as a result The call stack will contain the following : SMemSet::checkRecommitable SMemSet::recommitChunksUntilTargetReached SMemSet::getChunksFromTree SMemSet::getContiguousChunks SMemBasePool::getNewChunkSubgroup
Local fix
Consider using db2set DB2MEMDISCLAIM=NO followed by db2stop; db2start, which avoids the need for any coalesce check. Note that DB2MEMDISCLAIM=NO disables STMM-tuning of database_memory, though STMM will still tune the main consumers (bufferpools, locklist, package cache, shared sort) inside the existing database_memory size.
Problem summary
**************************************************************** * USERS AFFECTED: * * Larger Windows systems * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 11.1 Mod 3 Fix Pack 3 * ****************************************************************
Problem conclusion
Problem first fixed in DB2 Version 11.1 Mod 3 Fix pack 3
Temporary fix
see Local Fix
Comments
APAR Information
APAR number
IT21211
Reported component name
DB2 FOR LUW
Reported component ID
DB2FORLUW
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-06-27
Closed date
2018-03-15
Last modified date
2018-03-15
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Modules/Macros
sqo
Fix information
Fixed component name
DB2 FOR LUW
Fixed component ID
DB2FORLUW
Applicable component levels
RB10 PSN
UP
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
04 May 2022