一、查看数据库的dbid
select dbid from v$database;

二、修改参数文件
create pfile=’/tmp/pfile’ from spfile;
直接恢复spfile

三、rman操作
1.rman target /
2.startup nomount pfile=’xxxxxx’
3.set DBID=XXXXXXX

4.恢复控制文件

run{
allocate channel c1 type disk;
restore controlfile from '控制文件rman备份路径';
release channel c1;
}

5.加载控制文件
alter database mount;

6.恢复

run{
allocate channel c1 type disk;
[Set newname for datafile 1 to '新数据文件路径';]
restore database;
[switch datafile all;]
--rman中修改控制文件中datafile path
--sql "alter database rename file ''/opt/oracle/oradata/test/xff_02.dbf'' to ''/opt/oracle/oradata/test/xifenfei02.dbf''"
recover database;
release channel c1;
}