3         ONLINE  /oracle/oradata/TSMISC02/redo03.log

SQL>

检查alert日志：
Tue Nov 15 11:30:13 2005
Started first pass scan
Tue Nov 15 11:30:13 2005
Errors in file /oracle/admin/TSMISC02/udump/tsmisc02_ora_29582.trc:
ORA-00316: log 1 of thread 1, type 0 in header is not log file
ORA-00312: online log 1 thread 1: '/oracle/oradata/TSMISC02/redo01.log'
ORA-316 signalled during: ALTER DATABASE OPEN...
Tue Nov 15 11:31:09 2005
Restarting dead background process QMN0
QMN0 started with pid=9
Tue Nov 15 11:36:10 2005
Restarting dead background process QMN0
QMN0 started with pid=9
Tue Nov 15 11:41:11 2005
Restarting dead background process QMN0
QMN0 started with pid=9
Tue Nov 15 11:46:12 2005
Restarting dead background process QMN0
QMN0 started with pid=9
Tue Nov 15 11:51:13 2005
Restarting dead background process QMN0
QMN0 started with pid=9
Tue Nov 15 11:56:14 2005
Restarting dead background process QMN0
QMN0 started with pid=9

。。。

相关trace文件内容：
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[oracle@ts01 udump]$ ll tsmisc02_ora_29582.trc
-rw-r-----    1 oracle   oinstall      912 Nov 15 11:30 tsmisc02_ora_29582.trc
[oracle@ts01 udump]$ cat tsmisc02_ora_29582.trc
/oracle/admin/TSMISC02/udump/tsmisc02_ora_29582.trc
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
ORACLE_HOME = /oracle/product/920
System name:    Linux
Node name:      ts01
Release:        2.4.21-4.EL
Version:        #1 Fri Oct 3 18:13:58 EDT 2003
Machine:        i686
Instance name: TSMISC02
Redo thread mounted by this instance: 1
Oracle process number: 14
Unix process pid: 29582, image: oracle@ts01 (TNS V1-V3)

*** SESSION ID:(11.3) 2005-11-15 11:30:13.297
Thread checkpoint rba:0x00003e.00000002.0010 scn:0x0000.000a0c0b
On-disk rba:0x00003e.00000c1e.0000 scn:0x0000.000a257e
Use incremental checkpoint cache-low RBA
Thread 1 recovery from rba:0x00003e.0000095f.0000 scn:0x0000.00000000
ORA-00316: log 1 of thread 1, type 0 in header is not log file
ORA-00312: online log 1 thread 1: '/oracle/oradata/TSMISC02/redo01.log'
[oracle@ts01 udump]$

SQL> alter database clear logfile group 1;
alter database clear logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of thread 1
ORA-00312: online log 1 thread 1: '/oracle/oradata/TSMISC02/redo01.log'

SQL> alter database clear unarchived logfile group 1;
alter database clear unarchived logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of thread 1
ORA-00312: online log 1 thread 1: '/oracle/oradata/TSMISC02/redo01.log'

SQL>
SQL> archive log list;
Database log mode              Archive Mode