在配置oracle physical database 的时候会出现ORA-16401这个错误。
解决方法如下 ：
把备库的参数
log_archive_dest_3 设置为空即可 ：
修改前 ：
2011-07-02 19:16:32 2011-07-02 21:09:05        592          1 NO
2011-07-01 20:26:20 2011-07-01 20:26:35       1084          2 YES

FIRST_TIME          NEXT_TIME            SEQUENCE#    THREAD# APP
------------------- ------------------- ---------- ---------- ---
2011-07-02 19:16:32 2011-07-02 21:09:05        592          1 YES
2011-07-02 21:09:05 2011-07-02 22:30:08        593          1 NO
2011-07-02 21:09:05 2011-07-02 22:30:08        593          1 YES
2011-07-02 21:32:30 2011-07-02 22:45:28       1103          2 NO
2011-07-02 21:32:30 2011-07-02 22:45:28       1103          2 YES
2011-07-02 22:45:28 2011-07-02 23:13:01       1104          2 NO
2011-07-02 22:45:28 2011-07-02 23:13:01       1104          2 YES
2011-07-02 22:30:08 2011-07-02 23:13:01        594          1 NO
2011-07-02 22:30:08 2011-07-02 23:13:01        594          1

修改后 ：
2011-07-02 23:13:01 2011-07-03 00:03:19        595          1 YES
2011-07-02 23:13:01 2011-07-03 00:03:27       1105          2 YES

FIRST_TIME          NEXT_TIME            SEQUENCE#    THREAD# APP
------------------- ------------------- ---------- ---------- ---
2011-07-03 00:03:19 2011-07-03 00:04:04        596          1 YES
2011-07-03 00:03:27 2011-07-03 00:04:08       1106          2 YES


不会出现重复归档现象，虽然重复归档是可以忽略的错。但是还是要追究下问题根源 。
而且主库也会报这个错 ：
ORA-16401: archivelog rejected by RFS