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starland
[ORACLE]리스너 프로세스 2개 기동(Intermittent TNS listener hang, new child listener process forked.) [출처] 리스너 프로세스 2개 기동(Intermittent TNS listener hang, new child listener process forked.) 본문
[ORACLE]리스너 프로세스 2개 기동(Intermittent TNS listener hang, new child listener process forked.) [출처] 리스너 프로세스 2개 기동(Intermittent TNS listener hang, new child listener process forked.)
starland 2010. 9. 5. 10:36Subject: | Intermittent TNS listener hang, new child listener process forked. | |||
Doc ID: | Note:340091.1 | Type: | PROBLEM | |
Last Revision Date: | 11-JAN-2007 | Status: | PUBLISHED |
In this Document
Symptoms
Cause
Solution
References
Applies to:
Oracle Net Services - Version: 10.1.0.2.0 to 10.2.0.3.0This problem can occur on any platform.
All new connections via TNS listener hang, no errors reported
Symptoms
Intermittently the TNS listener hangs and new connections to the database are not possible.
Listener process can also consume high amount of CPU
Child TNS listener process is seen when doing a ps on the listener process, eg.:
$ ps -ef | grep tnslsnr
ora10g 8909 1 0 Sep 15 ? 902:44 /u05/10GHOME/DBHOME/bin/tnslsnr sales -inherit
ora10g 22685 8909 0 14:19:23 ? 0:00 /u05/10GHOME/DBHOME/bin/tnslsnr sales –inherit
Cause
This is a known problem addressed via non-published bug:4518443 (Abstract: Listener Gets Hung Up)
The issue is that the TNS listener can hang under load while spawning a process
Solution
Bug 4518443 is fixed in 10.2.0.3 - OR -
Apply Patch 4518443 for the problem (if a patch is available)
- OR -
As a workaround, the following parameter can be added to listener.ora
SUBSCRIBE_FOR_NODE_DOWN_EVENT_<listener_name>=OFF
For example, if the listener name is LISTENER (default), the parameter would be:
SUBSCRIBE_FOR_NODE_DOWN_EVENT_LISTENER=OFF
This will prevent the listener from registering against ONS (Oracle Notification Services), which is the area affected by bug:4518443. For more information on ONS, please refer to eg. the Oracle10g Release 2 documentation ("Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide").
Please note, adding SUBSCRIBE_FOR_NODE_DOWN_EVENT_<listener_name> to listener.ora file on RAC, will mean that FAN (fast application notification) will not be possible. See Note 220970.1 RAC: Frequently Asked Questions for further information on FAN
References
Keywords
'INTERMITTENTLY' 'RAC' 'NOTIFICATION~SERVICES' 'HIGH~CPU~USAGE' 'LISTENER~HANGS' 'HANGING' 'TNSLSNR'Help us improve our service. Please email us your comments for this document. .