Oracle 双监听器的配置

以Oracle Net看，数据库服务器可能也是客户端，因为tnsnames.ora可以有服务器的描述。也就是，只有监听器才会一直是服务器

以oracle net看，数据库服务器可能也是客户端，因为tnsnames.ora可以有服务器的描述。也就是，只有监听器才会一直是服务器

实例：监听=n：m

㈠ 双监听器的好处：

① 客户端故障转移--CF

② 客户端负载均衡--CLB

㈡ 注意事项：

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① 要保证1521端口可用，否则，，OEM将不可用，须emca重配

② 非标端口使用静态注册是个比较好的实践

配置案例：

[oracle@localhost admin]$ cat listener.ora 
think = 
  (DESCRIPTION = 
    (load_balance = on) 
    (failover = on) 
    (ADDRESS_LIST = 
      (ADDRESS=(PROTOCOL = tcp)(HOST= 192.168.1.113)(PORT= 1521) 
      (ADDRESS=(PROTOCOL = tcp)(HOST= 192.168.1.113)(PORT= 1522) 
    ) 
    ) 
  ) 
 
SID_LIST_think = 
  (SID_LIST = 
    (SID_DESC = 
      (GLOBAL_DBNAME = emrep.us.oracle.com) 
      (SID_NAME = emrep) 
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1))) 
 
water = 
  (DESCRIPTION = 
    (load_balance = on) 
    (failover = on) 
    (ADDRESS_LIST = 
      (ADDRESS=(PROTOCOL = tcp)(HOST= 192.168.1.113)(PORT= 1521)) 
      (ADDRESS=(PROTOCOL = tcp)(HOST= 192.168.1.113)(PORT= 1522)) 
    ) 
    ) 
  ) 
 
SID_LIST_water = 
  (SID_LIST = 
    (SID_DESC = 
      (GLOBAL_DBNAME = emrep.us.oracle.com) 
      (SID_NAME = emrep) 
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1))) 
       
 
[oracle@localhost admin]$ lsnrctl status water 
 
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 10-DEC-2012 21:47:22 
 
Copyright (c) 1991, 2005, Oracle.  All rights reserved. 
 
Connecting to (DESCRIPTION=(load_balance=on)(failover=on)(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.113)(PORT=1521))) 
STATUS of the LISTENER 
------------------------ 
Alias                    LISTENER 
Version                  TNSLSNR for Linux: Version 10.2.0.1.0 - Production 
Start Date                10-DEC-2012 20:02:23 
Uptime                    0 days 1 hr. 44 min. 58 sec 
Trace Level              off 
Security                  ON: Local OS Authentication 
SNMP                      OFF 
Listener Parameter File  /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora 
Listener Log File        /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log 
Listening Endpoints Summary... 
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.localdomain)(PORT=1521))) 
Services Summary... 
Service "emrep.us.oracle.com" has 1 instance(s). 
  Instance "emrep", status READY, has 1 handler(s) for this service... 
Service "emrep_XPT.us.oracle.com" has 1 instance(s). 
  Instance "emrep", status READY, has 1 handler(s) for this service... 
The command completed successfully 
 
  如果1521和1522并存，在业务不繁忙时，listener进程只会使用1521   
   
[oracle@localhost admin]$ lsnrctl status water 
 
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 10-DEC-2012 21:48:45 
 
Copyright (c) 1991, 2005, Oracle.  All rights reserved. 
 
Connecting to (DESCRIPTION=(load_balance=on)(failover=on)(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.113)(PORT=1522))) 
STATUS of the LISTENER 
------------------------ 
Alias                    water 
Version                  TNSLSNR for Linux: Version 10.2.0.1.0 - Production 
Start Date                10-DEC-2012 21:24:17 
Uptime                    0 days 0 hr. 24 min. 28 sec 
Trace Level              off 
Security                  ON: Local OS Authentication 
SNMP                      OFF 
Listener Parameter File  /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora 
Listener Log File        /u01/app/oracle/product/10.2.0/db_1/network/log/water.log 
Listening Endpoints Summary... 
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.113)(PORT=1522))) 
Services Summary... 
Service "emrep.us.oracle.com" has 1 instance(s). 
  Instance "emrep", status UNKNOWN, has 1 handler(s) for this service... 
The command completed successfully