RMAN报错

qqadmini

RMAN> run{
2> allocate channel cha1 type disk;
3> backup format '/ORA_BACKUP/rmantest/full_%T'
4> tag full_backup_bat
5> database;
6> release channel cha1;
7> }

allocated channel: cha1
channel cha1: sid=1822 devtype=DISK

Starting backup at 21-APR-09
channel cha1: starting full datafile backupset
channel cha1: specifying datafile(s) in backupset
input datafile fno=00005 name=/ORA_DATA/YKYY/YKHIS.dbf
input datafile fno=00015 name=/ORAHIS/product/10.2.0 s/e:ykdataYKDATA.dbf
input datafile fno=00016 name=/ORA_DATA/rman_ts.dbf
input datafile fno=00006 name=/ORA_DATA k.ora
input datafile fno=00003 name=/ORA_DATA/YKYY/sysaux01.dbf
input datafile fno=00001 name=/ORA_DATA/YKYY/system01.dbf
input datafile fno=00004 name=/ORA_DATA/YKYY/users01.dbf
input datafile fno=00002 name=/ORA_DATA/YKYY/undotbs01.dbf
input datafile fno=00010 name=/ORA_DATA/patient.ora
input datafile fno=00011 name=/ORA_DATA/result.ora
input datafile fno=00007 name=/ORA_DATA s.ora
input datafile fno=00008 name=/ORA_DATA/temp.ora
input datafile fno=00009 name=/ORA_DATA/sjgl.ora
input datafile fno=00012 name=/ORA_DATA/index1.ora
input datafile fno=00013 name=/ORA_DATA/index2.ora
input datafile fno=00014 name=/ORA_DATA/PACS.dbf
channel cha1: starting piece 1 at 21-APR-09
channel cha1: finished piece 1 at 21-APR-09
piece handle=/ORA_BACKUP/rmantest/full_20090421 tag=FULL_BACKUP_BAT comment=NONE
channel cha1: backup set complete, elapsed time: 00:05:27
channel cha1: starting full datafile backupset
channel cha1: specifying datafile(s) in backupset
including current control file in backupset
including current SPFILE in backupset
channel cha1: starting piece 1 at 21-APR-09
released channel: cha1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on cha1 channel at 04/21/2009 20:29:13
ORA-19504: failed to create file "/ORA_BACKUP/rmantest/full_20090421"
ORA-27038: created file already exists
Additional information: 1


然后,我删除full_2009421这个文件...
重新备份提示我不能创建unable create file /ORA_BACKUP/rmantest/full_2009041

我明明手工创建了unable create file /ORA_BACKUP/rmantest/这个文件夹,,并且权限是777了,,,
怎么还是出现这个问题 ?