|
Problem IC87146
|
Status: Closed |
HANG DURING BUFFERPOOL FLUSH WHEN STMM IS ALTERING A BUFFERPOOL |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
This is a timing issue that can happen when the following
conditions are true:
1) STMM:
- altering a buffer pool
- holding SQLO_LT_SQLB_BufferPool__prevBPDCachingLatch
- waiting on page cleaner waitpost
Stack trace:
sqloWaitEDUWaitPost
sqlbPauseCleanerGroup
sqlbFinalizeRTBPState
sqlbAlterBufferPoolAct
2) Page cleaner:
- waiting on an exclusive latch for page P1
Stack trace:
sqloltch_notrack
sqlbClnrAsyncWriteSetup
sqloDispatchNBlocks
sqloLioReadWriteNBlocks
sqlbClnrDispatchSomeAIO
sqlbClnrWriteSerializeIOList
sqlbClnrWritePages
sqlbClnrFindWork
3) Any EDU driving a flush of the dirty list by writing a log
record, e.g.
a) Index manager adding an index key:
- holding an exclusive latch on page P2
- holding SQLO_LT_SQLP_DBCB__add_logspace_sem
- waiting on SQLO_LT_SQLB_BufferPool__prevBPDCachingLatch
Stack trace:
sqlbFlushForDLSubset
sqlbFlush
sqlbflshConditional
sqlpgResSpace
sqlpWriteLR
sqliakn
sqlischa
sqlischa
b) At the same time, another Index manager EDU holding page P1,
e.g. during runstats processing:
- holding a shared latch on page P1
- waiting on a shared latch on page P2
Stack trace:
sqlbfix
sqlifix
sqliFixPageWithChildPtr
sqlischs
sqlistat
sqldIndexStats
sqlrLocalRunstats
sqlrrsta
sqlrr_runstats_DA |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 9.7 Fix pack 8. *
**************************************************************** |
| Local Fix: |
The workaround is to disable STMM. |
| available fix packs: |
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 |
First fixed in DB2 Version 9.7 Fix pack 8. |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC87456
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 10.10.2012
01.04.2013
01.04.2013 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP8
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.8
|
 |
