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在racnode1服务器上：
[root@racdb1 ~]# su - oracle
[oracle@racdb1 ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.1.0 Production on Wed Apr 21 13:44:12 2010
Copyright (c) 1982, 2009, Oracle. All rights reserved.
SQL> conn /as sysdba
Connected.
SQL> show parameter local_listener;
NAME TYPE VALUE
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local_listener string (DESCRIPTION=(ADDRESS_LIST=(AD
DRESS=(PROTOCOL=TCP)(HOST=rac1_vip)(PORT=1521))))
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=racscan)(PORT=1521))))' scope=both sid='racdb1';
System altered.
SQL>
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节点二上面也是，一样的修改。