要想給一個Oracle實例配置多個監(jiān)聽，首先要定義多個監(jiān)聽器，因為是多個監(jiān)聽，勢必會有一些監(jiān)聽端口不是1521.

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現(xiàn)在服務(wù)端的listener.ora文件中定義如下監(jiān)聽器:
[oracle@wang admin]$ cat listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LI =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = wang)(PORT = 1522))
    )
  )
[oracle@wang admin]$
注意：
Because all of the configuration parameters have default values, it is possible to start and use a listener with no configuration. This default listener has a name of LISTENER, supports no services on startup, and listens on the following TCP/IP protocol address: (ADDRESS=(PROTOCOL=tcp)(HOST=host_name)(PORT=1521))
這句話就能解釋，即使是在沒有l(wèi)istener.ora文件的情況下，也會可以啟動名為LISTENER的監(jiān)聽來監(jiān)聽1521端口。

一個監(jiān)聽1521端口的默認監(jiān)聽器，一個監(jiān)聽1522端口的監(jiān)聽器LI. 到現(xiàn)在我們還沒有給這兩個監(jiān)聽器配置相應(yīng)的Oracle服務(wù).

監(jiān)聽器與Oracle服務(wù)關(guān)聯(lián)有兩種方式，靜態(tài)注冊和動態(tài)注冊.

• 動態(tài)注冊

 動態(tài)注冊只能注冊到默認的1521端口,而這里我們需要一次性的動態(tài)注冊到兩個端口，因為需要使用local_listener.

先在服務(wù)端的tnsnames.ora文件里加入一個描述對象L,具體叫什么其實都無所謂的.然后會把它賦值給local_listner,這樣Pmon才知道往那些指定的IP和端口發(fā)送注冊請求.

動態(tài)注冊的時候,PMon會到tnsnames.ora里面查找描述對象的具體信息,
L =
  (
    DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.12)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.12)(PORT = 1522))
    )
  )

SQL> alter system set local_listener='l';
System altered.

其實local_listener也接受直接的地址描述或者地址描述列表.
SQL>  alter system set local_listener=' (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.12)(PORT = 1522))';

-更改local_listener后，原來注冊的服務(wù)會取消，然后PMON每隔一分鐘重參試注冊到新地址.下面我們手動觸發(fā)注冊.

SQL> alter system register; --注冊到新的local_listener

System altered.
SQL>  alter system set local_listener='(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.12)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.12)(PORT = 1522))))';--同時注冊到1521 和1522 端口.

System altered.

SQL> alter system register;

System altered.

--查看監(jiān)聽狀態(tài)：
[oracle@wang admin]$ lsnrctl status li
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 06-FEB-2018 18:47:13
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=wang)(PORT=1522)))
STATUS of the LISTENER
------------------------
Alias                     li
Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date                06-FEB-2018 17:38:09
Uptime                    0 days 1 hr. 9 min. 3 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/wang/li/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=wang)(PORT=1522)))
Services Summary...
Service "DBdb" has 1 instance(s).
  Instance "DBdb", status READY, has 1 handler(s) for this service...
Service "DBdbXDB" has 1 instance(s).
  Instance "DBdb", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@wang admin]$
[oracle@wang admin]$
[oracle@wang admin]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 06-FEB-2018 18:47:17
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production
Start Date                06-FEB-2018 17:38:04
Uptime                    0 days 1 hr. 9 min. 12 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/wang/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=wang)(PORT=1521)))
Services Summary...
Service "DBdb" has 1 instance(s).
  Instance "DBdb", status READY, has 1 handler(s) for this service...
Service "DBdbXDB" has 1 instance(s).
  Instance "DBdb", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@wang admin]$

動態(tài)注冊的服務(wù)名為service_name.db_domain,

• 靜態(tài)注冊

在服務(wù)端的listener.ora里對監(jiān)聽器LI配置靜態(tài)的服務(wù)名稱和實例名，下面沒有列出默認監(jiān)聽器的配置.

此時的默認監(jiān)聽器還是監(jiān)聽在1521端口的，而且沒有設(shè)置local_listener
(alter system reset local_listener 可以把local_listener還原成默認值).

所以Pmon會默認注冊到默認監(jiān)聽器的.

因此我們只需要在給監(jiān)聽在1522端口的LI配置靜態(tài)服務(wù)，這樣就有兩個監(jiān)聽器為我們的實例服務(wù)了.
配置如下：

[oracle@wang admin]$ cat listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LI =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = wang)(PORT = 1522))
    )
  )
SID_LIST_LI=
   (SID_LIST=
     (SID_DESC=
       (GLOBAL_DBNAME=DBdb)
       (ORACLE_HOME=/u01/app/oracle/product/11.2.0/db_1)
       (SID_NAME=DBdb)
     )
    )
[oracle@wang admin]$

名稱欄目：Oracle一個實例配置多個監(jiān)聽-創(chuàng)新互聯(lián)
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