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SK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/test/system01.dbf ---->system01.dbf
backing up blocks 38401 through 76800----------------------------------------------->注意此处
channel ORA_DISK_1: starting piece 2 at 19-FEB-15
channel ORA_DISK_1: finished piece 2 at 19-FEB-15
piece handle=/u02/06pvkh2l_2_1 tag=TAG20150219T011148 comment=NONE------------------>生成的backuppiece
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:16
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/test/system01.dbf ---->system01.dbf
backing up blocks 76801 through 102400---------------------------------------------->注意此处
channel ORA_DISK_1: starting piece 3 at 19-FEB-15
channel ORA_DISK_1: finished piece 3 at 19-FEB-15
piece handle=/u02/06pvkh2l_3_1 tag=TAG20150219T011148 comment=NON------------------>生成的backuppiece
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:16
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 19-FEB-15
channel ORA_DISK_1: finished piece 1 at 19-FEB-15
piece handle=/u02/09pvkh4o_1_1 tag=TAG20150219T011148 comment=NONE --->这个backuppiece是控制文件的自动备份，因为datafile1的备份会自动触发控制文件的备份。
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 19-FEB-15
RMAN>
一个datafile，使用backup section size 方式来做备份，分成了3个backuppiece，由于上述实验是在一个channel内完成的，体现不出来多个channel 同时干活的优势，因此，伙会在另外一片文章中分配2个channel 来备份该datafile。
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