客户的Oracle数据库服务器的aix操作系统意外崩溃后使用， 使用保留方式重装了AIX操作系统， 按照原来的方式建立了oracle用户及相关的组， 启动Oracle时却报错： [yxcs2@oracle]$ sqlplus SQL*Plus: Release 10.2.0.4.0 - Production on Tue Jul 7 11:16:18 2009 Copyright (c) 1982, 2007, Oracle. All Rights Reserved. Enter user-name: / as sysdba Connected. SQL>. startup ORA-00000: normal, successful completion SQL>. exit Disconnected [yxcs2@oracle]$ lsnrctl start LSNRCTL for IBM/AIX RISC System/6000: Version 10.2.0.4.0 - Production on 07-JUL-2009 11:16:37 Copyright (c) 1991, 2007, Oracle. All rights reserved. Starting /soft/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait... TNSLSNR for IBM/AIX RISC System/6000: Version 10.2.0.4.0 - Production Log messages written to /soft/oracle/product/10.2.0/db_1/network/log/listener.log Error listening on: (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)) TNS-12545: Connect failed because target host or object does not exist TNS-12560: TNS:protocol adapter error TNS-00515: Connect failed because target host or object does not exist Listener failed to start. See the error message(s) above... 数据库没有启动， 登陆时却提示Connected. 如果强制重启， 则提示ORA-00000， 监听也无法启动。 这个问题是由于该数据库服务器的主机名无法在/etc/hosts中找到而导致的， 解决方法就是在/etc/hosts中添加服务器的主机名的记录。 很有意思的一个错误， 记录之。