服务器改为IP,用PL/SQL登录主数据库，出现的错误是：
ORA-12541: TNS:no listener
官方的解释如下：
ORA-12541: TNS:no listener
Cause: The connection request could not be completed because the listener is not running.
Action: Ensure that the supplied destination address matches one of the addresses used by the listener - compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on the remote machine.
可是我也没配置错内部的参数啊，tnsname.ora也对啊。后来恍然大悟啊，赶紧看/etc/hosts，发现这里的vip设置的ip地址有问题了。改正后顺利登录主库。
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linux下改网卡地址
root用户直接用setup命令用提示改! 平时要学linux!
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