RMAN备份时ORA-19809错误

1、全量备份database，且备份类型指定为backupset

RMAN> backup as backupset database;

Starting backup at 13-FEB-14
using channel ORA_DISK_1
.....

2、再次备份users表空间，且备份类型指定为backupset

RMAN> backup as backupset device type disk  tablespace users;

Starting backup at 13-FEB-14
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=00004 name=/home/oracle/app/oradata/ora11g/users01.dbf
channel ORA_DISK_1: starting piece 1 at 13-FEB-14
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 02/13/2014 14:01:16
ORA-19809: limit exceeded for recovery files
ORA-19804: cannot reclaim 52428800 bytes disk space from 2147483648 limit

3、分析如上报错，超过恢复文件限制

SQL> show parameter db_recovery
NAME         TYPE  VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest       string  /home/oracle/app/flash_recover
       y_area
db_recovery_file_dest_size      big integer 2G
检查恢复文件上限设置，当前为2G

4、再检查恢复空间当前使用了多少
oracle@linux:~/app/flash_recovery_area> du -sm *
2010 ORA11G
已接近最大限制2G，故上述失败可能是由于目标备份文件生成的大小超过2048-2010,38M

5、重新指定retention策略，防止archivelog继续增加
RMAN> configure retention policy to recovery window of 7 days;

old RMAN configuration parameters:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
new RMAN configuration parameters:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
new RMAN configuration parameters are successfully stored

RMAN> configure retention policy to redundancy 3;

old RMAN configuration parameters:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
new RMAN configuration parameters:
CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
new RMAN configuration parameters are successfully stored

6、修改db_recovery_file_dest_size大小
SQL> alter system set db_recovery_file_dest_size=4g scope=both;

System altered.

7、再次备份users表空间
RMAN> backup as backupset device type disk  tablespace users;

Starting backup at 13-FEB-14
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=00004 name=/home/oracle/app/oradata/ora11g/users01.dbf
channel ORA_DISK_1: starting piece 1 at 13-FEB-14
......