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SQL>  select name ,file#,status  from v$datafile;
NAME FILE# STATUS
---------------------------------------------------- ---------- -------
+XIFENFEI/xff/datafile/system.256.776961315                   1 SYSTEM
+XIFENFEI/xff/datafile/sysaux.257.776961315                   2 ONLINE
+XIFENFEI/xff/datafile/undotbs1.258.776961317                 3 ONLINE
+XIFENFEI/xff/datafile/user_dd.dbf                            4 ONLINE
+XIFENFEI/xff/datafile/undotbs2.264.776961693                 5 ONLINE
+XIFENFEI/asm/datafile/xifenfei01.dbf.268.781967893           6 ONLINE
rows selected.
SQL>  alter database datafile 2 offline;

 

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