某数据库restore之后，尝试set newname但是报错RMAN-06015。我们可以先手工catalog进去，在set newname。
可以看如下的测试案例：
--1.纯粹的set newname是可以的
RMAN> run{
2> set newname for datafile 6 to '/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222';
3> }
executing command: SET NEWNAME
RMAN>
RMAN>
RMAN>
RMAN>
RMAN>
--2. 但是switch之后，就不可以。这是因为在你当前控制文件中，找不到该文件（asm上的文件）的信息
RMAN> run{
2> set newname for datafile 6 to '/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222';
3> switch datafile 6;
4> }
executing command: SET NEWNAME
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of switch command at 11/12/2014 10:36:09
RMAN-20230: datafile copy not found in the repository
RMAN-06015: error while looking up datafile copy name: /u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222
RMAN>
RMAN>
RMAN> -- 3.将该文件作为datafilecopy，catalog到控制文件中：
RMAN> catalog datafilecopy '/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222';
cataloged datafile copy
datafile copy file name=/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222 RECID=1 STAMP=863433432
RMAN> --4. 然后就可以顺利set newname后switch了。
RMAN> run{
2> set newname for datafile 6 to '/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222';
3> switch datafile 6;
4> }
executing command: SET NEWNAME
datafile 6 switched to datafile copy
input datafile copy RECID=1 STAMP=863433432 file name=/u01/oracle11gR2/oracle/oradata/ora11g/U_NOLOB2.dbf222
RMAN>
RMAN>