使用asm保存的控制文件，如果想增加一份镜像，怎么办？
sho parameter control_files
alter system set control_files='+DATA1/v102/controlfile/current.261.637923577','+DATA1' scope=spfile sid='*';
srvctl stop database -d orcl
rman target /
startup nomount
restore controlfile from '+DATA1/v102/controlfile/current.261.637923577';
记录输出的控制文件副本信息
alter system set control_files='+DATA1/v102/controlfile/current.261.637923577','+DATA1/v102/controlfile/current.269.638120375' scope=spfile sid='*';
shu immediate
srvctl start database -d orcl
参考：
How to duplicate a controlfile when ASM is involved (Doc ID 345180.1)
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