首先备份数据库：
RMAN> run { allocate channel d1 type disk; allocate channel d2 type disk; backup database format '/mnt/hgfs/backup/online_bk/%U'; release channel d1; release channel d2; }
using target database control file instead of recovery catalog
allocated channel: d1
channel d1: sid=157 devtype=DISK
allocated channel: d2
channel d2: sid=148 devtype=DISK
Starting backup
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