[oracle@test ~]$ lsnrctl stop listener_demo92  -->停止监听，可以看出不需要任何密码即可停止 
                                              
LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 08:22:26          
                                              
Copyright (c) 1991, 2006, Oracle Corporation. All rights reserved.             
                                              
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))         
The command completed successfully 

[oracle@test ~]$ lsnrctl                                                 
                                                             
LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 08:24:09                         
Copyright (c) 1991, 2006, Oracle Corporation. All rights reserved.                            
                                                             
Welcome to LSNRCTL, type "help" for information.                                     
LSNRCTL> set current_listener listener_demo92 -->设置当前监听器                             
Current Listener is listener_demo92                                            
LSNRCTL> start       -->启动过程也不需要任何密码,启动的详细信息省略                         
LSNRCTL> change_password  -->使用change_password来设置密码                                
Old password:                                                       
New password:                                                       
Reenter new password:                                                   
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))                        
Password changed for listener_demo92                                           
The command completed successfully                                            
LSNRCTL> save_config    -->注意此处的save_config失败                                 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))                        
TNS-01169: The listener has not recognized the password                                  
LSNRCTL> set password    -->输入新设定的密码验证                                    
Password:                                                         
The command completed successfully                                            
LSNRCTL> save_config    -->再次save_config成功                                     
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))                        
Saved listener_demo92 configuration parameters.                                      
Listener Parameter File  /oracle/92/network/admin/listener.ora                              
Old Parameter File  /oracle/92/network/admin/listener.bak                                
The command completed successfully                                            
                                                             
-->增加密码之后可以看到listener.ora文件中有一条新增的记录，即密码选项(注：尽管使用了密码管理方式,仍然可以无需密码启动监听)
[oracle@test admin]$ more listener.ora                                          
 #----ADDED BY TNSLSNR 26-JUN-2011 05:12:48---                                      
 PASSWORDS_listener_demo92 =                                               
 #--------------------------------------------

[oracle@test ~]$ lsnrctl stop listener_demo92                        
LSNRCTL for Linux: Version 9.2.0.8.0 - Production on 26-JUN-2011 06:09:51          
Copyright (c) 1991, 2006, Oracle Corporation. All rights reserved.             
                                              
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))         
TNS-01169: The listener has not recognized the password  -->收到错误信息，需要使用密码认证

[oracle@test ~]$ lsnrctl                            
LSNRCTL> set current_listener listener_demo92                 
Current Listener is listener_demo92                      
LSNRCTL> stop                                 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))   
TNS-01169: The listener has not recognized the password            
LSNRCTL> set password                             
Password:                                   
The command completed successfully                       
LSNRCTL> stop                                 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(PORT=1521)))   
The command completed successfully                       
LSNRCTL> status                                
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=test)(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                  

-->在 Oracle 9i中，使用save_config命令将会失败                                     
 LSNRCTL> save_config                                                 
 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<hostname>)(PORT=<port>)))                  
 TNS-01169: The listener has not recognized the password                                
                                                            
-->应该先使用set password之后再save_config，则保存配置成功。                              
 LSNRCTL> set password                                                
 Password: <the password you chose>                                          
 The command completed successfully                          
/*在Oracle 10g 中不会出现类似的问题，因为在10g中可以使用基于操作系统验证方式。listener将检测到如果用户属于dba组的成员，
将会被授予改变密码，保存配置以及停止监听等权限。 */