对于DBA来说，启动和关闭oracle监听器是很基础的任务，但是Linux系统管理员或者程序员有时也需要在开发数据库中做一些基本的DBA操作，因此了解一些基本的管理操作对他们来说很重要。
本文将讨论用LSNRCTL命令启动、关闭和查看监听器的状态的方法。
怎样启动、关闭和重新启动oracle监听器
在启动、关闭或者重启oracle监听器之前确保使用lsnrctl status命令检查oracle监听器的状态。除了得到监听器的状态之外，你还可以从lsnrctl status命令的输出中得到如下的信息：
监听器的启动时间
监听器的运行时间
监听器参数文件listener.ora的位置，通常位于$ORACLE_HOME/network/admin目录下
监听器日志文件的位置
如果oracle监听器没用运行，你将得到如下的信息
$ lsnrctl status
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:27:39
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 2: No such file or directory
如果oracle监听器正在运行，你将得到如下信息
$ lsnrctl status
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:27:02
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for Linux: Version 11.1.0.6.0 - Production
Start Date 29-APR-2009 18:43:13
Uptime 6 days 21 hr. 43 min. 49 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.1.0/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/devdb/listener/alert/log.xml
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.2)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary…
Service “devdb” has 1 instance(s).
Instance “devdb”, status UNKNOWN, has 1 handler(s) for this service…
Service “devdb.thegeekstuff.com” has 1 instance(s).
Instance “devdb”, status READY, has 1 handler(s) for this service…
Service “devdbXDB.thegeekstuff.com” has 1 instance(s).
Instance “devdb”, status READY, has 1 handler(s) for this service…
Service “devdb_XPT.thegeekstuff.com” has 1 instance(s).
Instance “devdb”, status READY, has 1 handler(s) for this service…
The command completed successfully
2.启动oracle监听器
如果oracle监听器没用运行，你可以用lsnrctl start命令启动oracle监听器，该命令将启动所有的监听器，如果你只想启动特定的监听器，可以再start后面指定监听器的名字，例如：lsnrctl start [listener-name]。
$ lsnrctl start
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:27:42
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Starting /u01/app/oracle/product/11.1.0/bin/tnslsnr: please wait…
TNSLSNR for Linux: Version 11.1.0.6.0 - Production
System parameter file is /u01/app/oracle/product/11.1.0/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/devdb/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.2)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for Linux: Version 11.1.0.6.0 - Production
Start Date 04-APR-2009 16:27:42
Uptime 0 days 0 hr. 0 min. 0 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.1.0/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/devdb/listener/alert/log.xml
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.2)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary…
Service “devdb” has 1 instance(s).
Instance “devdb”, status UNKNOWN, has 1 handler(s) for this service…
The command completed successfully
3.关闭oracle监听器
如果oracle监听器正在运行，可以使用lsnrctl stop命令关闭oracle监听器，该命令将关闭所有的监听器，如果你只想关闭特定的监听器，可以再stop后面指定监听器的名字，例如：lsnrctl stop [listener-name]
$ lsnrctl stop
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:27:37
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
The command completed successfully
4.重启oracle监听器
用lsnrctl reload重启监听器，此命令可以代替lsnrctl stop和lsnrctl start。重启将会在不需要关闭和启动监听器的情况下读取listener.ora的配置。
$ lsnrctl reload
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 17:03:31
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
The command completed successfully
Oracle监听器帮助
1.查看所有的监听器命令
lsnrctl hep命令可以显示所有可用的监听器命令。在oracle11g中其输出如下：
start - Start the Oracle listener stop - Stop the Oracle listener status - Display the current status of the Oracle listener services - Retrieve the listener services information version - Display the oracle listener version information reload - This will reload the oracle listener SID and parameter files. This is equivalent to lsnrctl stop and lsnrctl start. save_config - This will save the current settings to the listener.ora file and also take a backup of the listener.ora file before overwriting it. If there are no changes, it will display the message “No changes to save for LISTENER” trace - Enable the tracing at the listener level. The available options are ‘trace OFF’, ‘trace USER’, ‘trace ADMIN’ or ‘trace SUPPORT’ spawn - Spawns a new with the program with the spawn_alias mentioned in the listener.ora file change_password - Set the new password to the oracle listener (or) change the existing listener password. show - Display log files and other relevant listener information.
$ lsnrctl help
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:12:09
Copyright (c) 1991, 2007, Oracle. All rights reserved.
The following operations are available
An asterisk (*) denotes a modifier or extended command:
start stop status
services version reload
save_config trace spawn
change_password quit exit
set* show*
2.得到指定监听器命令的详细帮助信息
可以使用lsnrctl help得到指定的命令的详细帮助信息。如下所示
$ lsnrctl help show
LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:22:28
Copyright (c) 1991, 2007, Oracle. All rights reserved.
The following operations are available after show
An asterisk (*) denotes a modifier or extended command:
rawmode displaymode
rules trc_file
trc_directory trc_level
log_file log_directory
log_status current_listener
inbound_connect_timeout startup_waittime
snmp_visible save_config_on_stop
dynamic_registration
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