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ora-01157问题怎么解决？

环境：redhat 9 + oracle 817
问题：昨天突然掉电之后数据库启动之后就提示这个错误。数据是非归档模式，而且这个数据文件还有用。怎么恢复。

[oracle@ccdevsvr root]$ svrmgrl

oracle server manager release 3.1.7.0.0 - production

copyright (c) 1997, 1999, oracle corporation.  all rights reserved.

oracle8i enterprise edition release 8.1.7.4.0 - production
with the partitioning option
jserver release 8.1.7.4.0 - production

svrmgr> connect system/manager as sysdba
connected.
svrmgr> show
instance                      local
spool                         off
timing                         off
termout                      on
echo                         off
stoponerror                   off
autorecovery                   off
logsource                      <default>
maxdata                      20480
numwidth                      10
charwidth                      80
longwidth                      80
datewidth                      9
labwidth                      32
compatibility                native
retries                      infinite
server output                off
autoprint                      off
fetchrows                      infinite
appinfo                      off (usertext : oracle server manager)
svrmgr> startup
ora-01081: cannot start already-running oracle - shut it down first
svrmgr> shutdown immediate
ora-01109: database not open
database dismounted.
oracle instance shut down.
svrmgr> startup
oracle instance started.
total system global area                      73109664 bytes
fixed size                                        73888 bytes
variable size                                  56086528 bytes
database buffers                               16777216 bytes
redo buffers                                     172032 bytes
database mounted.
ora-01157: cannot identify/lock data file 10 - see dbwr trace file
ora-01110: data file 10: '/home/oracle/dwbx_wmstat.dbf'
svrmgr>

[oracle@ccdevsvr oracle]$ pwd
/home/oracle
[oracle@ccdevsvr oracle]$ ll *.dbf
-rwxrwxrwx 1 oracle dba    209723392 nov 29 11:47 iwbx_wmindx.dbf
-rwxrwxrwx 1 oracle dba    104865792 dec  1 09:35 test.dbf
[oracle@ccdevsvr oracle]$

数据库是否归档模式？
在mount状态：

归档的话：
sql>alter database datafile 'i:\oradata\examora\test01.dbf' offline;
非归档的话：
sql>alter database datafile 'i:\oradata\examora\test01.dbf' offline drop;

然后在
sql>alter database open;

ORA-01157问题解决[1]

[入库：2005年8月18日] [更新：2007年3月24日]