RMAN> restore standby controlfile from '/tmp/rman_backup/standby_0dss6ds7_1_1.ctl';
Starting restore at 2018/02/26 14:18:35
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=21 device type=DISK
channel ORA_DISK_1: restoring control file
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 02/26/2018 14:18:36
ORA-19870: error while restoring backup piece /tmp/rman_backup/standby_0dss6ds7_1_1.ctl
ORA-19504: failed to create file "+DATA_VG/bbdg/controlfile/cont.ctl"
ORA-17502: ksfdcre:3 Failed to create file +DATA_VG/bbdg/controlfile/cont.ctl
ORA-15001: diskgroup "DATA_VG" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance
ORA-15055: unable to connect to ASM instance
ORA-27300: OS system dependent operation:open failed with status: 13
原因：没有创建数据库，/u01/app/oracle/product/11.2.0/db_1/bin/oracle权限不对
处理方法：chmod 6555 /u01/app/oracle/product/11.2.0/db_1/bin/oracle
参考博文：
http://blog.csdn.net/jxzkin/article/details/8020180
http://www.itpub.net/thread-2053471-1-1.html
搭建Dataguard，使用RMAN还原数据时无法连接ASM实例
原文：http://blog.51cto.com/linux10000/2073450