1、全量備份database，且備份類型指定爲backupset
RMAN> backup as backupset database;
Starting backup at 13-FEB-14
using channel ORA_DISK_1
.....
2、再次備份users表空間，且備份類型指定爲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、分析如上報錯，超過恢復文件限制
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
檢查恢復文件上限設置，當前爲2G
4、再檢查恢復空間當前使用了多少
oracle@linux:~/app/flash_recovery_area> du -sm *
2010 ORA11G
已接近最大限制2G，故上述失敗可能是由於目標備份文件生成的大小超過2048-2010,38M
5、重新指定retention策略，防止archivelog繼續增加
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、再次備份users表空間
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
......