验证service_names、db_name、db_unique_name在注册动态监听服务名时的作用

监听中动态注册时的服务名：如果没有设定service_names，将拼接db_unique_name和db_domain参数值来注册监听，（service_names优先级高），验证如下：。
  ----（很多文档里写的是db_name和db_domain这是不准确的）

  本实验的db_domain为空。Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod

1. db_unique_name为PRODA  db_name 为PROD  service_names 为空--reset参数值     监听状态中有一个服务PRODA
2. db_unique_name为PRODA  db_name 为PROD  service_names 为PRO    监听状态中有两个服务 PRODA  PRO
3. db_unique_name为PROD   db_name 为PROD   service_names 为PRO   监听状态中有两个服务PROD    PRO

1.db_unique_name为PRODA，db_name 为PROD，service_names 为空--reset参数值，监听状态中有一个服务：PRODA

SQL> show parameter service_name
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
service_names                        string
SQL> show parameter db_unique
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                       string      PRODA
SQL> show parameter db_name
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_name                              string      PROD
SQL> show parameter db_doma
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_domain                            string
[oracle@ocm1 admin]$ lsnrctl status LSNR2
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 09-APR-2014 23:36:38
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
STATUS of the LISTENER
------------------------
Alias                     LSNR2
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                09-APR-2014 23:31:20
Uptime                    0 days 0 hr. 5 min. 18 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0.1/dbhome_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0.1/dbhome_1/network/log/lsnr2.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
Services Summary...
Service "PRODA" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service.

2.db_unique_name为PRODA，db_name 为PROD，service_names 为PRO，监听状态中有两个服务：PRODA、PRO

SQL> show parameter db_uni
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                       string      PRODA
SQL> show parameter service
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
service_names                        string      PRO
SQL> show parameter db_n
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_name                              string      PROD
SQL> show parameter db_do
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_domain                            string

[oracle@ocm1 admin]$ lsnrctl status LSNR2
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 09-APR-2014 23:51:30
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
STATUS of the LISTENER
------------------------
Alias                     LSNR2
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                09-APR-2014 23:48:39
Uptime                    0 days 0 hr. 2 min. 51 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0.1/dbhome_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0.1/dbhome_1/network/log/lsnr2.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
Services Summary...
Service "PRO" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
Service "PRODA" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
Service "PRODA_XPT" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
The command completed successfully

3.db_unique_name为PROD，db_name 为PROD，service_names 为PRO，监听状态中有两个服务：PROD、PRO

SQL> show parameter db_doma
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_domain                            string
SQL> show parameter db_uni
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_unique_name                       string      PROD
SQL> show parameter db_n
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_name                              string      PROD
SQL> alter system set service_names='PRO';
System altered.
SQL> show parameter service
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
service_names                        string      PRO
SQL> alter system register;
System altered.

[oracle@ocm1 admin]$ lsnrctl status LSNR2
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 09-APR-2014 23:48:52
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
STATUS of the LISTENER
------------------------
Alias                     LSNR2
Version                   TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date                09-APR-2014 23:48:39
Uptime                    0 days 0 hr. 0 min. 13 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/10.2.0.1/dbhome_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/product/10.2.0.1/dbhome_1/network/log/lsnr2.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ocm1.bys.com)(PORT=1526)))
Services Summary...
Service "PRO" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
Service "PROD" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
Service "PROD_XPT" has 1 instance(s).
  Instance "PROD", status READY, has 4 handler(s) for this service...
The command completed successfully