Two listener messages are displayed when the Oracle database is connected to hang.

When the Oracle database is connected to hang, there are two listener, one is the other sub-process
The process is as follows:
1. When a problem occurs, the user connects to the hang and two listener occurs. The existing connection is normal.
$ Ps-ef | grep lsnr
Oracle 26327 1 0 December 24? /Oracle/product/10.2.0.1/bin/tnslsnr LISTENER-inherit
Oracle 16352 12931 1 10:44:26 pts/4 grep lsnr
Oracle 28413 26327 0 21:40:46? 0: 00/oracle/product/10.2.0.1/bin/tnslsnr LISTENER-inherit
Patrol 29576 29575 0 21:45:19? 0: 00/oracle/product/10.2.0.1/bin/lsnrctl stat LISTENER

2. to quickly recover a problem and kill the process
$ Kill-9 26327

3. Restart
$ Lsnrctl start

LSNRCTL for HPUX: Version 10.2.0.1.0-Production on 26-DEC-2012 10:44:54

Copyright (c) 1991,200 5, Oracle. All rights reserved.

Starting/oracle/product/10.2.0.1/bin/tnslsnr: please wait...

TNSLSNR for HPUX: Version 10.2.0.1.0-Production
System parameter file is/oracle/product/10.2.0.1/network/admin/listener. ora
Log messages written to/oracle/product/10.2.0.1/network/log/listener. log
Listening on: (DESCRIPTION = (ADDRESS = (PROTOCOL = tcp) (HOST = rps02) (PORT = 1521 )))
Listening on: (DESCRIPTION = (ADDRESS = (PROTOCOL = ipc) (KEY = EXTPROC0 )))

Connecting to (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = rps02) (PORT = 1521 )))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for HPUX: Version 10.2.0.1.0-Production
Start Date 26-DEC-2012 10:44:56
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP ON
Listener Parameter File/oracle/product/10.2.0.1/network/admin/listener. ora
Listener Log File/oracle/product/10.2.0.1/network/log/listener. log
Listening Endpoints Summary...
(DESCRIPTION = (ADDRESS = (PROTOCOL = tcp) (HOST = rps02) (PORT = 1521 )))
(DESCRIPTION = (ADDRESS = (PROTOCOL = ipc) (KEY = EXTPROC0 )))
Services Summary...
Service "PLSExtProc" has 1 instance (s ).
Instance "PLSExtProc", status UNKNOWN, has 1 handler (s) for this service...
The command completed successfully

4, restore to normal, only one listener
$
$ Ps-ef | grep lsnr
Oracle 16503 1 0 10:44:56? 0: 00/oracle/product/10.2.0.1/bin/tnslsnr LISTENER-inherit
Oracle 17637 12931 1 10:48:17 pts/4 grep lsnr
$

5. Check metalink in the future. It is basically determined to be a bug. oracle Patch 4518443 is required.
For details, see the file Intermittent TNS Listener Hang, New Child Listener Process Forked [ID 340091.1].
In addition to patching, other solutions provided by oracle are:
A. Modify the listener. ora file.
SUBSCRIBE_FOR_NODE_DOWN_EVENT _ <listener_name> = OFF
B. Move the ons. config file.
Cd $ ORACLE_HOME/opmn/conf
Mv ons. config ons. config. ori

1 2 Next Page