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ORA-01233: file string is read only - cannot recover using backup control file
Cause: An attempt to do media recovery using a backup control file found that
one of the files is marked read only. Read only files do not normally need to be
recovered, but recovery with a backup control file must recover all online files.
Action: If the file really is read only, take it offline before the recovery, and bring
the read only tablespace online after the database is open. If the file does need
recovery use a control file from the time the file was read-write. If the correct
control file is not available, use CREATE CONTROLFILE to make one.
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