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Cause: The file access enqueue could not be obtained for a
file specified in a backup, copy or restore operation. If
the enqueue type shown is 'shared', then the file is the
input file for a backup or copy. If the type is 'exclusive',
then the file is the output file for a datafile copy or
restore which is attempting to overwrite the currently
active version of that file - in this case, the file must be
offline or the database must be closed. If the type is
'read-only', then you are attempting to back up or copy this
file while the database is in NOARCHIVELOG mode.

Action: Wait until the conflicting operation is complete,
then retry the copy or backup. If the database is in
NOARCHIVELOG mode, then all files being backed up must be
closed cleanly.

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