RMAN出现ORA-19806错误

Question

RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 2;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u01/oracle/db_back/%F.ctl';
CONFIGURE DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT   '/u01/oracle/db_back/%U' MAXPIECESIZE 20000000;
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE EXCLUDE FOR TABLESPACE 'EXAMPLE';
CONFIGURE EXCLUDE FOR TABLESPACE 'STAGING';
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/u01/oracle/dbs/snapcf_wilson.f'; # default----备份数据文件8，4
RMAN> backup datafile 8,4;
Starting backup at 11-MAR-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=143 devtype=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: sid=134 devtype=DISK
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00008 name=/u01/oradata/wilson/paulll01.dbf
channel ORA_DISK_1: starting piece 1 at 11-MAR-11
channel ORA_DISK_2: starting full datafile backupset
channel ORA_DISK_2: specifying datafile(s) in backupset
input datafile fno=00004 name=/u01/oradata/wilson/users01.dbf
channel ORA_DISK_2: starting piece 1 at 11-MAR-11
channel ORA_DISK_1: finished piece 1 at 11-MAR-11 with 2 copies and tag TAG20110311T145635
piece handle=/u01/oracle/db_back/12m6v813_1_1 comment=NONE
piece handle=/u01/oracle/db_back/12m6v813_1_2 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_2 channel at 03/11/2011 14:56:36
ORA-19806: cannot make duplex backups in recovery area提出问题：
从备份的输出内容来看，好像/u01/oracle/db_back/下面备份成功，但是怎么闪回恢复区备份失败？奇怪，我把数据备份设置到/u01/oracle/db_back/下面了，怎么还会备份到闪回恢复区啊，请教各位高手。
明明配置了CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/u01/oracle/db_back/%U' MAXPIECESIZE 20000000，那备份怎么会即存在/u01/oracle/db_back又存在闪回恢复区？
问题发现：
如果将CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2改为 CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1;就可以成功备份。为什么写成2就不行呢?写成2又该如何配置呢?
Edited by: Lonion on 2012-8-30 上午1:53

Answer 1

CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2
备份数据文件到磁盘时保持2份
flashback area不支持 多份backup拷贝
RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters for database with db_unique_name G11R23 are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO 'D:\APP\ML\PRODUCT\11.2.0\DBHOME_1\DATABASE\SNCFG11R23.ORA'; # default
RMAN> backup datafile 3 format 'D:\%U.bak';
Starting backup at 30-AUG-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00003 name=D:\APP\ML\ORADATA\G11R23\DATAFILE\O1_MF_UNDOTBS1_83C9K4YY_.DBF
channel ORA_DISK_1: starting piece 1 at 30-AUG-12
channel ORA_DISK_1: finished piece 1 at 30-AUG-12 with 2 copies and tag TAG20120830T171519
piece handle=D:\03NJV4T7_1_1.BAK comment=NONE
piece handle=D:\03NJV4T7_1_2.BAK comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 30-AUG-12CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1 ;
修改为仅保留一份数据文件备份
RMAN> backup datafile 3 format 'D:\%U.bak';
Starting backup at 30-AUG-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00003 name=D:\APP\ML\ORADATA\G11R23\DATAFILE\O1_MF_UNDOTBS1_83C9K4YY_.DBF
channel ORA_DISK_1: starting piece 1 at 30-AUG-12
channel ORA_DISK_1: finished piece 1 at 30-AUG-12
piece handle=D:\05NJV51I_1_1.BAK tag=TAG20120830T171738 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 30-AUG-12
对于flashback area 需要 CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1 ;
你的问题 "好像/u01/oracle/db_back/下面备份成功，但是怎么闪回恢复区备份失败？"
CONFIGURE DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;
PARALLELISM 2
你的并行度是2 但是
CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/u01/oracle/db_back/%U' MAXPIECESIZE 20000000;
你仅指定了一个channel 的 备份路径 ， 另一个channel 没有！！
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Maclean Liu
Oracle Database Administrator
Oracle Certified 10g/11g Master     
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Edited by: Liu Maclean on 2012-8-30 上午2:28