|
Problem IC88431
|
Status: Closed |
HADR STANDBY MAY HANG WHEN ROS IS ENABLED |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When Read On Standby is enabled, the DB2 Standby database may
hang ( and eventually cause the primary database to hang ).
The db2redom ( redo master ) edu will show a stack with top
functions :
HdrKickPooledAgents
HdrForceAppsInReplayOnlyWindow
and there will be an Asynchronous Background Process (ABP or
db2taskp ) that show as suspended with a stack trace similar to
:
thread_wait
sqloWaitEDUWaitPost
IntrptWaitLock
getTaskProAssignment
main
abpAgentEntryPoint
sqleIndCoordProcessRequest
The problem is timing dependent and will not always occur. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* HADR users *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* upgrade the DB2 server to V9.7 Fix Pack 8 *
**************************************************************** |
| Local Fix: |
On the standby instance set :
db2set DB2_DISABLE_ABP=ON
before starting the instance, this will disable the Asynchronous
background tasks from starting.
However, this should not be set on the primary as that may cause
maintenance problems ( e.g. Asynchronous Index Cleanup not
running . ).
Hence when a failover happens, a failback should be done as
soon as possible, or the registry variable should be unset.
on the standby server. |
| 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 |
This problem has first been fixed in V9.7 Fix Pack 8 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 20.11.2012
19.04.2013
19.04.2013 |
| 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
|
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