Can't start oracle getting error ora-01157 cannot identify/lock

After power feliure I'm getting the follwoing error when try to start oracle 8i on Unix

SVRMGR> startup
ORACLE instance started.
Total System Global Area                         56036184 bytes
Fixed Size                                          72536 bytes
Variable Size                                    39014400 bytes
Database Buffers                                 16777216 bytes
Redo Buffers                                       172032 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 8 - see DBWR trace file
ORA-01110: data file 8: '/ora1/OraHome1/oradata/ora1/oem_repository.dbf'

what need to be done and please can you porvide examples.

Thanks in advance
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ORA-01157: cannot identify/lock data file string - see DBWR trace file
Cause: The background process was either unable to find one of the data files or failed to lock it because the file was already in use. The database will prohibit access to this file but other files will be unaffected. However, the first instance to open the database will need to access all online data files. The accompanying error from the operating system describes why the file could not be identified.
Action: At the operating system level, make the file available to the database. Then either open the database or do an ALTER SYSTEM CHECK DATAFILES
most probably the file is corrupt. You can restore the file from the latest backup and give the command

however, If I suspect correctly, then you do not have any backups. If OEM_repository does not contain any of users object,
drop the file and later recreate your oem repository

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bolicatAuthor Commented:
You are correct  don't have backup, how do I drop the file and recreate?

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alter database datafile '/ora1/OraHome1/oradata/ora1/oem_repository.dbf' offline;


alter database datafile '/ora1/OraHome1/oradata/ora1/oem_repository.dbf' offline drop;

but make sure that ur important data is not in that file
is the db up now?
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