|
Problem IC79197
|
Status: Closed |
DB2 INSTANCE COULD HANG WHEN MESSAGE QUEUE RESOURCES ARE SCARCE |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
In certain rare scenarios it is possible for a DB2 instance on
UNIX/Linux to hang when the system runs out of message queue
resources. This type of hang is mostly commonly encountered
while executing parallel loads. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* DB2 on UNIX/Linux *
****************************************************************
* PROBLEM DESCRIPTION: *
* Sending messages on system message queues may block forever *
* when resources are scarce. Stack traces will show threads *
* blocked in msgsnd. *
****************************************************************
* RECOMMENDATION: *
* Retry the operation. Increase system message queue *
* resources in the kernel if possible. Upgrade to DB2 v9.5 *
* fixpack 9. *
**************************************************************** |
| Local Fix: |
Retry the operation with less parallelism. If possible,
increase the message queue resources configured in the kernel. |
| available fix packs: |
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
Allow non-blocking message sends and gracefully handle cases
when they fail due to limited resources. |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC79211
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 12.10.2011
12.03.2012
12.03.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.0.,
9.5.
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.5.0.9
|
 |
