2、 如：
>lsnrctl status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ip)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNSrotocol adapter error
TNS-00511: No listener
IBM/AIX RISC System/6000 Error: 79: Connection refused
>lsnrctl start
LSNRCTL for IBM/AIX RISC System/6000: Version10.2.0.1.0 - Production on 02-AUG-
2010 09:26:12
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Starting /usr/oracle/oms/102_64/bin/tnslsnr: please wait...
TNSLSNR for IBM/AIX RISC System/6000: Version10.2.0.1.0 - Production
System parameter file is /usr/oracle/oms/102_64/network/admin/listener.ora
Log messages written to /usr/oracle/oms/102_64/network/log/listener.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ip)(PORT=1521)
))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ip)(PORT=1521)
))
3、 数据库不能启动
$ sqlplus "/as sysdba"
SQL*Plus: Release10.2.0.1.0 - Production on Mon Aug 2 09:26:24 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> select * from v$instance;
select * from v$instance
*
ERROR at line 1:
ORA-01034: ORACLE not available
SQL>
SQL>
SQL>
SQL> startup
ORA-01078: failure in processing system parameters
LRM-00109: could not open parameter file '/usr/oracle/oms/102_64/dbs/initTEST.ora
原因：上面的原因主要是因为原来更改了/etc/hosts文件，数据库重启后，AIX系统的hostname和/etc/hosts中的不一致，让系统的hostname和/etc/hosts中的名字保持一致解决上面问题。Oracle的监听器listener.ora和AIX的/ect/hosts有很大的关系。