CROSSCHECK命令:
用于核对磁盘和磁带上的备份文件，以确保RMAN资料库与备份文件保持同步。注意：该命令只会检查RMAN资料库所记载的备份文件。当执行crosscheck命令时，如果资料库记录不匹配于备份文件的物理状态，那么该命令会更新资料库记录的状态信息。备份文件的状态包括：AVALIABLE、UNAVALIABLE、EXPIRED。
1、核对所有备份集 RMAN> crosscheck backup;
2、核对所有数据文件的备份集 RMAN> crosscheck backup of database;
3、核对特定表空间的备份集 RMAN> crosscheck backup of tablespace users;
4、核对特定数据文件的备份集 RMAN> crosscheck backup of datafile 4;
5、核对控制文件的备份集 RMAN> crosscheck backup of controlfile;
6、核对SPFILE的备份集 RMAN> crosscheck backup of spfile;
7、核对归档日志的备份集 RMAN> crosscheck backup of archivelog sequence 3;
8、核对所有映像副本 RMAN> crosscheck copy;
9、核对所有数据文件的映像副本 RMAN> crosscheck copy of database;
10、核对特定表空间的映像副本 RMAN> crosscheck copy of tablespace users;
11、核对特定数据文件的映像副本 RMAN> crosscheck copy of datafile 6;
12、核对归档日志的映像副本 RMAN> crosscheck copy of archivelog sequence 4;
13、核对控制文件的映像副本 RMAN> crosscheck copy of controlfile;
前段时间看到有无效备份，怎么也删除不掉。
后来使用：
以下方法搞定：
crosscheck copy;
或者
crosscheck backup;
然后
delete expired copy;
前面测试使用的命令如下：
delete expired backup;
delete expired archivelog all;
RMAN> delete expired archivelog all;
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=8055 instance=racdb2 device type=DISK
specification does not match any archived log in the repository
RMAN>
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
-------------------- ------ ------------------ --------------------
Control File Copy 1 2013-05-10 14:28:30 /opt/backup/control01.ctl
Control File Copy 2 2013-10-15 10:41:06 /tmp/control01.ctl
Control File Copy 4 2013-10-21 16:25:03 +RECOVERY/racdb/snapshot/snapcf_racdb2.f
RMAN> delete obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
using channel ORA_DISK_1
Deleting the following obsolete backups and copies:
Type Key Completion Time Filename/Handle
-------------------- ------ ------------------ --------------------
Control File Copy 1 2013-05-10 14:28:30 /opt/backup/control01.ctl
Control File Copy 2 2013-10-15 10:41:06 /tmp/control01.ctl
Control File Copy 4 2013-10-21 16:25:03 +RECOVERY/racdb/snapshot/snapcf_racdb2.f
Do you really want to delete the above objects (enter YES or NO)? YES
RMAN-06207: WARNING: 3 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 /opt/backup/control01.ctl
RMAN-06214: Datafile Copy /tmp/control01.ctl
RMAN-06214: Datafile Copy +RECOVERY/racdb/snapshot/snapcf_racdb2.f
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
-------------------- ------ ------------------ --------------------
Control File Copy 1 2013-05-10 14:28:30 /opt/backup/control01.ctl
Control File Copy 2 2013-10-15 10:41:06 /tmp/control01.ctl
Control File Copy 4 2013-10-21 16:25:03 +RECOVERY/racdb/snapshot/snapcf_racdb2.f
RMAN> crosscheck backupset ;
RMAN>
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
-------------------- ------ ------------------ --------------------
Control File Copy 1 2013-05-10 14:28:30 /opt/backup/control01.ctl
Control File Copy 2 2013-10-15 10:41:06 /tmp/control01.ctl
Control File Copy 4 2013-10-21 16:25:03 +RECOVERY/racdb/snapshot/snapcf_racdb2.f
RMAN> delete expired backup;
using channel ORA_DISK_1
specification does not match any backup in the repository
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
-------------------- ------ ------------------ --------------------
Control File Copy 1 2013-05-10 14:28:30 /opt/backup/control01.ctl
Control File Copy 2 2013-10-15 10:41:06 /tmp/control01.ctl
Control File Copy 4 2013-10-21 16:25:03 +RECOVERY/racdb/snapshot/snapcf_racdb2.f
