ORA-01157: cannot identify/lock data file string - see DBWR
trace file
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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. Accompanying error from the operating system
describes why the file could not be identified.
Action: Have operating system make file available to
database. Then either open the database or do ALTER SYSTEM
CHECK DATAFILES.
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