错误信息：
ORA-07286: sksagdi: cannot obtain device information.

主库日志状态：
show parameter dest;
select error,status from gv$archive_dest where dest_id=11;
show parameter dest;
select error,status from gv$archive_dest where dest_id=11;

解决方法，重新备数据库，重启日志进程：

alter database recover managed standby database cancel;
shutdown immediate;
startup;
alter database recover managed standby database using current logfile disconnect from session;

alter system set log_archive_dest_state_11=defer;
alter system set log_archive_dest_state_11=enable;
alter system switch logfile；
select error,status from gv$archive_dest where dest_id=11;