首先要先定位磁盤問題，懷疑到是過期備份導致的。
df -h | awk '$5 >= 90||$4>=90 {print}'
Filesystem Size Used Avail Use% Mounted on
1.4T 1.3T 115G 92% /d01_test2
15G 15G 373M 98% /u01_test1
12G 12G 545M 96% /u01_test2然後切換合適的ORACLE_SID之後，我們開始RMAN操作
rman target /
Configure retention policy to redundancy 1;--指保留一次備份，其餘的都是過期的 <default>
--Configure retention policy to recovery window of 7 days;--指保留7天內的備份，其餘的都是過期的
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type Key Completion Time Filename/Handle
-------------------- ------ ------------------ --------------------
Backup Set 97 11-MAY-2013 00:25:40
Backup Piece 101 11-MAY-2013 00:25:40 /ora_daily2/xxx_041013211003_g3o6oo7o_3_1.rmn
Backup Set 97 11-MAY-2013 00:25:39
Backup Piece 99 11-MAY-2013 00:25:39 /ora_daily2/xxx_041013211003_g3o6oo7o_2_1.rmn
Backup Set 97 11-MAY-2013 00:25:32
Backup Piece 75 11-MAY-2013 00:25:32 /ora_daily2/xxx_041013211003_g3o6oo7o_1_1.rmn
Backup Set 98 11-MAY-2013 00:25:41
Backup Piece 103 11-MAY-2013 00:25:41 /ora_daily2/xxx_041013211003_g4o6oo7q_3_1.rmn
Backup Set 98 11-MAY-2013 00:25:40
Backup Piece 100 11-MAY-2013 00:25:40 /ora_daily2/xxx_041013211003_g4o6oo7q_2_1.rmn
Backup Set 98 11-MAY-2013 00:25:39
Backup Piece 98 11-MAY-2013 00:25:39 /ora_daily2/xxx_041013211003_g4o6oo7q_1_1.rmn
Backup Set 111 11-MAY-2013 00:25:44
Backup Piece 116 11-MAY-2013 00:25:44 /ora_daily2/xxx_041013211003_g9o6pm32_1_1.rmn
Backup Set 112 11-MAY-2013 00:25:45
delete obsolete;--就會刪除過期備份下面還可以檢查下歸檔日誌
crosscheck archivelog all;--檢查過期歸檔日誌 delete expired archivelog all;--刪除過期歸檔日誌