flashback空间爆满IMAGECOPY 占的比率最大，通过RMAN释放空间

1.查看当前datafilecopy目录已经为空

$ pwd

2.显示结果是imagecopy使用量仍然存在

SQL> select * from? v$flash_recovery_area_usage

FLASHBACKLOG????????????????? 0???????????????????????? 0?????????????? 0

3.进入rman

RMAN> delete datafilecopy all;

using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=131 devtype=DISK

List of Datafile Copies
Key???? File S Completion Time Ckp SCN??? Ckp Time??????? Name
------- ---- - --------------- ---------- --------------- ----
3?????? 1??? A 12-MAY-12?????? 941737???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf
5?????? 2??? A 12-MAY-12?????? 942514???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_undotbs1_7tvmk2vs_.dbf
2?????? 6??? A 12-MAY-12?????? 941653???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki2_7tvmfgpr_.dbf
6?????? 7??? A 12-MAY-12?????? 942723???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_small_7tvmkxrd_.dbf
4?????? 8??? A 12-MAY-12?????? 942708???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki3_7tvmko0y_.dbf

Do you really want to delete the above objects (enter YES or NO)? yes

RMAN-06207: WARNING: 5 objects could not be deleted for DISK channel(s) due
RMAN-06208:????????? to mismatched status.? Use CROSSCHECK command to fix status
RMAN-06210: List of Mismatched objects
RMAN-06211: ==========================
RMAN-06212:?? Object Type?? Filename/Handle
RMAN-06213: --------------- ---------------------------------------------------
RMAN-06214: Datafile Copy?? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf
RMAN-06214: Datafile Copy?? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_undotbs1_7tvmk2vs_.dbf
RMAN-06214: Datafile Copy?? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki2_7tvmfgpr_.dbf
RMAN-06214: Datafile Copy?? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_small_7tvmkxrd_.dbf
RMAN-06214: Datafile Copy?? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki3_7tvmko0y_.dbf

4.报错，MS认不到，对文件逐个做crosscheck

RMAN>? crosscheck datafilecopy '/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf';

released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=131 devtype=DISK
validation failed for datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf recid=3 stamp=783081765
Crosschecked 1 objects

......

5.成功删除

RMAN> delete datafilecopy all;

using channel ORA_DISK_1

List of Datafile Copies
Key???? File S Completion Time Ckp SCN??? Ckp Time??????? Name
------- ---- - --------------- ---------- --------------- ----
3?????? 1??? X 12-MAY-12?????? 941737???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf
5?????? 2??? X 12-MAY-12?????? 942514???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_undotbs1_7tvmk2vs_.dbf
2?????? 6??? X 12-MAY-12?????? 941653???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki2_7tvmfgpr_.dbf
6?????? 7??? X 12-MAY-12?????? 942723???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_small_7tvmkxrd_.dbf
4?????? 8??? X 12-MAY-12?????? 942708???? 12-MAY-12?????? /u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki3_7tvmko0y_.dbf

Do you really want to delete the above objects (enter YES or NO)? yes
deleted datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_system_7tvmfno3_.dbf recid=3 stamp=783081765
deleted datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_undotbs1_7tvmk2vs_.dbf recid=5 stamp=783081792
deleted datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki2_7tvmfgpr_.dbf recid=2 stamp=783081736
deleted datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_small_7tvmkxrd_.dbf recid=6 stamp=783081793
deleted datafile copy
datafile copy filename=/u01/app/oracle/flash_recovery_area/AIKI/datafile/o1_mf_aiki3_7tvmko0y_.dbf recid=4 stamp=783081785
Deleted 5 objects


RMAN>

SQL> select * from? v$flash_recovery_area_usage ? 2? / FILE_TYPE??? PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES ------------ ------------------ ------------------------- --------------- CONTROLFILE?????????????????? 0???????????????????????? 0?????????????? 0 ONLINELOG???????????????????? 0???????????????????????? 0?????????????? 0 ARCHIVELOG??????????????????? 0???????????????????????? 0?????????????? 0 BACKUPPIECE?????????????????? 0???????????????????????? 0?????????????? 0 IMAGECOPY???????????????????? 0???????????????????????? 0?????????????? 0 FLASHBACKLOG????????????????? 0???????????????????????? 0?????????????? 0 6 rows selected.