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。