用oracle用户先脱机:
SQL> alter database datafile 21 offline;
用grid用户复制:
ASMCMD> cp /u01/oracle/dbs/user01.dbf +data/orcl/datafile/user01
用oracle用户改名并修复:
SQL> alter database rename file '/u01/oracle/dbs/user01.dbf' to '+data/orcl/datafile/user01';
SQL> alter database datafile 21 online;
SQL> recover datafile 21;
SQL> select file_name,file_id,ONLINE_STATUS,tablespace_name from dba_data_files;