Oracle: file needs recovery (offline mode)

select d.file# f#,, d.status, h.status
from v$datafile d, v$datafile_header h
where d.file# = h.file#
and (d.status not in ('SYSTEM','ONLINE') or h.status != 'ONLINE' );

If there are such files, the recovery is necessary:

  1. restore the file from the backup
  2. recover datafile ‘&the_file_name’ ;
  3. alter database datafile ‘&the_file_name’ online;

Another possibility (if there are a lot of files):

  1. restore the files from the backup
  2. recover tablespace ‘&tbs_name’ ;
  3. alter tablespace ‘&tbs_name’ online;

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