在使用RMAN备份的时候，提示这个
ORA-19606: Cannot copy or restore to snapshot control file
validation failed for control file copy
control file copy file name=/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_test.f RECID=3 STAMP=963660887
Crosschecked 1 objects
specification does not match any datafile copy in the repository
specification does not match any archived log in the repository
released channel: t1
released channel: t2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of delete command on t2 channel at 06/16/2018 17:46:52
ORA-19606: Cannot copy or restore to snapshot control file
Recovery Manager complete.
Sat Jun 16 17:46:52 HKT 2018
[oracle@test log]$ 解决方法：
https://docs.oracle.com/cd/E11882_01/server.112/e17766/e19500.htm
或者直接在RMAN中，show all , configure 控制文件，弄个新的，就可以了 。
ORA-19606: Cannot copy or restore to snapshot control file
Cause: A control file copy or restore operation specified the name of the snapshot control file as the output file. It is not permitted to overwrite the snapshot control file in this manner. Other methods are available to create the snapshot control file.
Action: Specify a different file name and retry the operation. If this is a restore, then the restore conversation remains active and more files may be specified.