验证：
[oracle@strong ~]$ cd RmanBackup/
[oracle@strong RmanBackup]$ ll
total 1129544
-rw-r----- 1 oracle dba 1146822656 Nov 26 14:35 db0_ORCL_20201126_7
-rw-r----- 1 oracle dba 9830400 Nov 26 14:35 db0_ORCL_20201126_8
[oracle@strong backup]$ more backup.log
Recovery Manager: Release 11.2.0.4.0 - Production on Thu Nov 26 14:35:27 2020
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1575005578)
RMAN> run{
2> allocate channel c1 device type disk;
3> backup incremental level 0 database format '/home/oracle/RmanBackup/db0_%d_%T_%s';
4> release channel c1;
5> }
6>
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=41 device type=DISK
Starting backup at 26-NOV-20
channel c1: starting incremental level 0 datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/orcl/system01.dbf
input datafile file number=00002 name=/u01/app/oracle/oradata/orcl/sysaux01.dbf
input datafile file number=00005 name=/u01/app/oracle/oradata/orcl/example01.dbf
input datafile file number=00003 name=/u01/app/oracle/oradata/orcl/undotbs01.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/orcl/users01.dbf
channel c1: starting piece 1 at 26-NOV-20
channel c1: finished piece 1 at 26-NOV-20
piece handle=/home/oracle/RmanBackup/db0_ORCL_20201126_7 tag=TAG20201126T143528 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:15
channel c1: starting incremental level 0 datafile backup set
channel c1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel c1: starting piece 1 at 26-NOV-20
channel c1: finished piece 1 at 26-NOV-20
piece handle=/home/oracle/RmanBackup/db0_ORCL_20201126_8 tag=TAG20201126T143528 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:01
Finished backup at 26-NOV-20