Restore datafile from an OS copy

Question

Hi all,
I have a 10GR1 database open with datafiles marked as MISSING in the dictionnary.
I have an OS copy oh those datafiles. These datafiles are contained in a Read Only tablespace.
Could you explain me how can i recover this datafile to the database ?
Thanks.

Answer 1

Nope....the db does not need to be in mount mode.
Presumably the missing files have been created in $ORACLE_HOME/dbs?
If you have multiple missing files then the alert log will point out to you which missing file relates to which tablespace and datafile#.
Obtain your offline datafile names:
select FILE#, name, status from v$datafile where status != 'ONLINE';Take tablespace offline first.
alter tablespace tbname offline;Rename the datafile.
alter database rename file 'abc' to 'xyz';Bring tablespace online.
alter tablespace tbname online;Ensure all datafiles are online:
select FILE#, name, status from v$datafile;Put the tablespace back into readonly mode:
alter tablespace tbname read only;Check status of tablespace:
select TABLESPACE_NAME, STATUS from dba_tablespaces;Refer to: http://docs.oracle.com/cd/B19306_01/server.102/b14231/dfiles.htm#i1006457