A fix is available
APAR status
Closed as program error.
Error description
Storage leak in the BB1RMID POOL of TRQ's . This might show up as LC23 and LC32 contention or page latch contention. Storage leak is for page P-LOCK exit acquiered TRQ's . The DUMP wil typically show lots of entries for x'50' long TRQ blocks that have a TRQNEXT pointing to itself and a TRQWAIT value of 5000. This could cause fragmentation of the POOL, which in turn might cause DSNSVBK to run down long chains in the POOL, trying to fit the next block in. . DB2STGLK/K
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: DB2 data sharing users. * **************************************************************** * PROBLEM DESCRIPTION: Storage leak in a buffer manager pool, * * where timer wait control blocks used * * by the page P-lock exit are lost. * * This can result in fragmentation of the * * pool, which can increase wait time for * * page latches, latch class 23, or latch * * class 32. * **************************************************************** * RECOMMENDATION: * **************************************************************** The page P-lock exit employs a two-phase page latch wait, where the timer wait control block (TRQ) may need to be reinserted in the queue after an initial timeout. The reinsert logic fails to reset a link pointer, which may result in the TRQ being dropped off the queue entirely.
Problem conclusion
The TRQ reinsert logic has been modified to ensure that the residual link pointer is cleared.
Temporary fix
Comments
APAR Information
APAR number
PM66173
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2012-06-05
Closed date
2012-07-25
Last modified date
2012-09-05
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK80522
Modules/Macros
DSNB1TMR
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RA10 PSY UK80522
UP12/08/09 P F208
Fix is available
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Document Information
Modified date:
05 September 2012