ORA-00350: log string of instance string (thread string) needs to be archived

admin

ORA-00350: log string of instance string (thread string) needs to be archived
Cause: The command cannot be done because the log has not been archived, and
media recovery has been enabled.

Action: Archive the log or disable media recovery. If the command supports an
UNARCHIVED option then it can be used. However this may result in making
backups unuseable, and forcing the drop of some offline files.