oracle 11G dataguard 恢复

1. 检查主备机的sys 密码是否一致，忘记密码可以修改，同步 。alter user sys identified by xxx； orapwd file=oraxxx.ora password=admin entries=40 force=y; 
2. 检查静态tnsnames.ora 和listener.ora ，确保正常测试：sqlplus sys/oracle@COMSTAR2 as sysdba / sqlplus sys/oracle@COMSTAR1 as sysdba
3. 备库 sql>shutdown immediate,删除原有的数据文件。
4. rman target sys/oracle@comstar1 auxiliary sys/oracle@comstar2 nocatalog
5. duplicate target database for standby from active database nofilenamecheck;