ORA-19573: cannot obtain string enqueue for datafile string Cause: The file a...

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ORA-19573: cannotobtain string enqueuefor datafile string
Cause: Thefile access enqueue could not be obtained for a file specified in a
backup, copy or restore operation. If the enqueue type shown is 'shared', thenthe
file is the input file for a backup or copy. If the type is 'exclusive', thenthe file is
the output file for a datafile copy or restore which is attempting to overwritethe
currently active version of that file - in this case, the file must be offlineor the
database must be closed. If the type is 'read-only', then you are attempting toback
up or copy this file while the database is in NOARCHIVELOG mode.
14-6 OracleDatabase Error Messages
Action: Waituntil 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.