fishcat论 RMAN备份过的归档如果不加delete input的话,下次居然会重复备份

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RMAN> BACKUP   
2> FORMAT '/backup/arch_%T_%s_%p'
3> SKIP INACCESSIBLE
4> ARCHIVELOG ALL;

Starting backup at 08-JAN-13
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=67 RECID=1 STAMP=804194038
input archived log thread=1 sequence=68 RECID=2 STAMP=804194161
input archived log thread=1 sequence=69 RECID=3 STAMP=804194208
input archived log thread=1 sequence=70 RECID=4 STAMP=804194396
channel ORA_DISK_1: starting piece 1 at 08-JAN-13
channel ORA_DISK_1: finished piece 1 at 08-JAN-13
piece handle=/backup/arch_20130108_3_1 tag=TAG20130108T191956 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 08-JAN-13

RMAN> BACKUP
2> FORMAT '/backup/arch_%T_%s_%p'
3> SKIP INACCESSIBLE
4> ARCHIVELOG ALL;

Starting backup at 08-JAN-13
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=67 RECID=1 STAMP=804194038
input archived log thread=1 sequence=68 RECID=2 STAMP=804194161
input archived log thread=1 sequence=69 RECID=3 STAMP=804194208
input archived log thread=1 sequence=70 RECID=4 STAMP=804194396
input archived log thread=1 sequence=71 RECID=5 STAMP=804194410
channel ORA_DISK_1: starting piece 1 at 08-JAN-13
channel ORA_DISK_1: finished piece 1 at 08-JAN-13
piece handle=/backup/arch_20130108_4_1 tag=TAG20130108T192010 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 08-JAN-13