11.2由于RAC中GRID的分离以及实现了SCAN功能，使得监听的优先级发生了改变。
一个11.2环境的单实例数据库，配置了ASM，随后在同一个服务器上又新建了一个数据库，同样使用这个ASM，但是发现连接这个新的数据库时出现了错误。
[oracle@dbserver1 ~]$ export ORACLE_SID=al32utf8
[oracle@dbserver1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 5 14:04:57 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
SQL> set pages 100 lines 120
SQL> show parameter service_names
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
service_names string al32utf8
SQL> conn thams/thams@192.168.20.101/al32utf8
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Warning: You are no longer connected to ORACLE.
用这种简易连接的方式连接这个服务器上第一个创建的数据库实例，没有任何问题。检查监听的状态：
[oracle@dbserver1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 05-SEP-2011 17:50:09
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dbserver1)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 31-AUG-2011 17:26:15
Uptime 5 days 0 hr. 23 min. 53 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/dbserver1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dbserver1)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "fhacdb1" has 1 instance(s).
Instance "fhacdb1", status READY, has 1 handler(s) for this service...
Service "fhacdbXDB" has 1 instance(s).
Instance "fhacdb1", status READY, has 1 handler(s) for this service...
The command completed successfully
可以看到，数据库的监听并没有包含新建的al32utf8的服务，尝试在数据库中进行手工注册操作，错误依旧。
这时想起数据库配置了GRID，切换到grid用户，果然发现了问题所在：
[oracle@dbserver1 ~]$ su - grid
Password:
[grid@dbserver1 ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 05-SEP-2011 17:50:59
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 04-AUG-2011 16:14:28
Uptime 32 days 1 hr. 36 min. 33 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/grid/product/11.2.0/gridhome_1/network/admin/listener.ora
Listener Log File /u01/app/grid/diag/tnslsnr/dbserver1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dbserver1)(PORT=1522)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM", status READY, has 1 handler(s) for this service...
Service "al32utf8" has 1 instance(s).
Instance "al32utf8", status READY, has 1 handler(s) for this service...
Service "al32utf8XDB" has 1 instance(s).
Instance "al32utf8", status READY, has 1 handler(s) for this service...
The command completed successfully
[grid@dbserver1 ~]$ exit
logout
[oracle@dbserver1 ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 5 17:51:20 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
SQL> conn thams/thams@192.168.20.101:1522/al32utf8
Connected.
SQL> select name from v$database;
NAME
---------
AL32UTF8
SQL> select instance_name from v$instance;
INSTANCE_NAME
----------------
al32utf8
原来新建的数据库实例注册到grid用户下的监听上了。之所以和另外一个数据库不同，是因为那个数据库是在grid安装之前，因此数据库使用ORACLE_HOME本身的监听。而一旦配置了grid，则grid用户下的监听启动，而Oracle的优先级显然是先找grid下的监听，然后再去考虑ORACLE_HOME下的监听。
当然，对于没有使用grid的情况下，11.2的监听和之前的版本没有什么区别。
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