Datafile offline后 无法online

数据文件1个月前前被offline 后,忘了online
最近才发现这个问题,rman 的的备份策略是保存一周,.现在数据文件是recover 状态
SQL> select status from v$datafile;
STATUS
SYSTEM
ONLINE
ONLINE
ONLINE
ONLINE
RECOVER
进行了如下操作
[oracle@localhost ~]$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Sun Oct 14 15:21:39 2012
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: ORCL (DBID=1282456281)
RMAN> restore datafile 6;
Starting restore at 14-OCT-12
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=158 devtype=DISK
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00006 to /u01/app/oracle/oradata/orcl/test.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/flash_recovery_area/ORCL/backupset/2012_10_14/o1_mf_nnndf_TAG20121014T113901_87ndypbn_.bkp
channel ORA_DISK_1: restored backup piece 1
piece handle=/u01/app/oracle/flash_recovery_area/ORCL/backupset/2012_10_14/o1_mf_nnndf_TAG20121014T113901_87ndypbn_.bkp tag=TAG20121014T113901
channel ORA_DISK_1: restore complete, elapsed time: 00:00:15
Finished restore at 14-OCT-12
RMAN> recover datafile 6;
Starting recover at 14-OCT-12
using channel ORA_DISK_1
starting media recovery
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 10/14/2012 15:22:33
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of log thread 1 seq 97 lowscn 10552775 found to restore
RMAN-06025: no backup of log thread 1 seq 96 lowscn 10552545 found to restore
RMAN-06025: no backup of log thread 1 seq 95 lowscn 10550471 found to restore
RMAN> exit
Recovery Manager complete.
--一周前的全备和增量备份,归档日志已经被删除
[oracle@localhost ~]$
[oracle@localhost ~]$
[oracle@localhost ~]$
[oracle@localhost ~]$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Sun Oct 14 15:22:51 2012
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 1241513984 bytes
Fixed Size 1219136 bytes
Variable Size 335545792 bytes
Database Buffers 889192448 bytes
Redo Buffers 15556608 bytes
Database mounted.
SQL> alter database open;
Database altered.
数据库能正常启动
SQL> select status from v$datafile;
STATUS
SYSTEM
ONLINE
ONLINE
ONLINE
ONLINE
RECOVER
6 rows selected.
状态还是recover 状态
SQL> alter database datafile 6 online;
alter database datafile 6 online
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/u01/app/oracle/oradata/orcl/test.dbf'
如何使该数据文件online ?
以上环境是我的模拟的 有一个生产库和该情况基本一样

谢谢 部分归档日志的备份已经被删除(因为备份策略 不可能保存所有的归档日志)
只有选择第二种了.
数据文件意外offline 或变成recover状态,由于对系统没有影响(如我遇到SYSAUX表空间),一直没有发现,能到发现了,已经是很长时间了,归档日志已经不全了(备份策略没有保存那么长时间)
这类问题有什么好的办法可以避免吗?

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