oracle startup error

[oracle@c2 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Sat Oct 22 15:57:41 2011

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area  285212672 bytes
Fixed Size                  1218992 bytes
Variable Size             100664912 bytes
Database Buffers          180355072 bytes
Redo Buffers                2973696 bytes
Database mounted.
ORA-00322: log 3 of thread 1 is not current copy
ORA-00312: online log 3 thread 1: '/oradata/orcl/redo03.log'
 

解决方法：

SQL> select group#,status from v$log;

    GROUP# STATUS
---------- ------------------------------------------------
         1 CURRENT
         3 INACTIVE
         2 INACTIVE
 

SQL> alter database clear logfile group 3;

Database altered.

SQL> alter database open;

Database altered.

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
/oradata/orcl/system01.dbf
/oradata/orcl/undotbs01.dbf
/oradata/orcl/sysaux01.dbf
/oradata/orcl/users01.dbf
/oradata/orcl/example01.dbf