[Oracle log file recovery] archived and non-current redo logfile is damaged

Background:
Now, I want to practice Incremental backup of RMAN. The original test database is in non-archive mode.

So after calling and shutdown an instance, the open instance fails to get started.

sys@ORACLE10> alter database open;alter database open*ERROR at line 1:ORA-00313: open failed for members of log group 1 of thread 1ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/oracle10/redo01.log'

Here, we can see that the log file in log group 1 is damaged.
View v $ log view

sys@ORACLE10> select group#,sequence#,archived,status from v$log;    GROUP#  SEQUENCE# ARC STATUS---------- ---------- --- ----------------         1          2 YES INACTIVE         3          1 YES INACTIVE         2          3 NO  CURRENT

As you can know, the reorganization isNon-currentStatus, andArchived
Use the clear command to recreate the log file

sys@ORACLE10> alter database clear logfile group 1;Database altered.

If the log group alsoNo archive, You need:
Alter database clear Unarchived logfile group 1;

Open the database and back up the database again.

sys@ORACLE10> alter database open;Database altered.