A fix is available
APAR status
Closed as program error.
Error description
A user LOB table space was growing. This was due to a seemingly old value for read claim lrsn for the buffer pool. LOB space reuse is tracked at buffer pool level using oldest read claim LRSN. Any objects using a 32k buffer pool are considered when calculating the oldest reader Lrsn. The buffer pool was also shared by directory LOB table space dsndb01.spt01 and there was an old commit-LRSN for DSNDB01.SPT01 which caused the problem. Additional keywords: commit lsn , read lsn , read only .
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: DB2 data sharing users. * **************************************************************** * PROBLEM DESCRIPTION: Table space growth due to old read-lsn * * value. * **************************************************************** * RECOMMENDATION: * **************************************************************** Any table space with a LOB column will register its commit-lsn as a read-lsn. However, the commit-lsn value can be very old if the object has been read-only for a long time. This old read-lsn gets propagated to the buffer pool level in data sharing, and can prevent space reuse for other objects sharing the same buffer pool.
Problem conclusion
The code which registers a commit-lsn as a read-lsn has been modified to use the current end-of-log lrsn if the object is currently read-only, rather than its local commit-lsn value. Additionally, the local commit-lsn tracking will be improved to allow for advancement when another member gives up its update interest.
Temporary fix
Comments
APAR Information
APAR number
PM80804
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-01-17
Closed date
2013-02-28
Last modified date
2013-04-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK92094
Modules/Macros
DSNB1CLM DSNB1PPP
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RA10 PSY UK92094
UP13/03/16 P F303
Fix is available
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Document Information
Modified date:
02 April 2013