1、用catalog可以看到两个备份文件没有注册，可是貌似注册不了，没有任何错误提示，用list也看不到。
2、11.2版本开启自动控制文件备份之后，改变数据结构M000会备份控制文件吗，怎么我都等了一天了也没见自动备份啊，好奇怪的说！
以上两个问题不知道有没有大大知道答案啊，求赐教。
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操作系统是：Linux babihoo 2.6.9-55.EL #1 Wed May 2 13:52:16 EDT 2007 i686 i686 i386 GNU/Linux
oracle版本：Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
问题1：
RMAN> catalog db_recovery_file_dest;
searching for all files in the recovery area
List of Files Unknown to the Database
=====================================
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456666_9jr5yv5c_.bkp
Do you really want to catalog the above files (enter YES or NO)? yes
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456666_9jr5yv5c_.bkp
RMAN> list backup of controlfile;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
5 Full 9.36M DISK 00:00:04 25-FEB-14
BP Key: 5 Status: AVAILABLE Compressed: NO Tag: TAG20140225T120700
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456420_9jr5q6bl_.bkp
Control File Included: Ckp SCN: 914584 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
6 Full 9.33M DISK 00:00:00 25-FEB-14
BP Key: 6 Status: AVAILABLE Compressed: NO Tag: TAG20140225T121059
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T121059_9jr5ypwr_.bkp
Control File Included: Ckp SCN: 914735 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
7 Full 9.33M DISK 00:00:05 25-FEB-14
BP Key: 7 Status: AVAILABLE Compressed: NO Tag: TAG20140225T163047
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T163047_9jro5w9v_.bkp
Control File Included: Ckp SCN: 926276 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
8 Full 9.36M DISK 00:00:03 25-FEB-14
BP Key: 8 Status: AVAILABLE Compressed: NO Tag: TAG20140225T163055
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840472255_9jro61vb_.bkp
Control File Included: Ckp SCN: 926284 Ckp time: 25-FEB-14
[oracle@babihoo 2014_02_25]$ pwd
/opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25
[oracle@babihoo 2014_02_25]$ ll
total 38464
-rw-r----- 1 oracle oinstall 9830400 Feb 25 10:46 o1_mf_s_840451559_9jr0z96j_.bkp
-rw-r----- 1 oracle oinstall 9830400 Feb 25 12:07 o1_mf_s_840456420_9jr5q6bl_.bkp
-rw-r----- 1 oracle oinstall 9830400 Feb 25 12:11 o1_mf_s_840456666_9jr5yv5c_.bkp
-rw-r----- 1 oracle oinstall 9830400 Feb 25 16:30 o1_mf_s_840472255_9jro61vb_.bkp
这两个文件都没有删除过。而且这两个文件曾经都用来恢复过控制文件。
RMAN> restore controlfile from autobackup;
(省略)
channel ORA_DISK_1: AUTOBACKUP /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp found in the recovery area
RMAN> recover database;
（省略）
List of Cataloged Files
=======================
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 9 is already on disk as file /opt/oracle/oradata/babihoo11g/redo03.log
archived log file name=/opt/oracle/oradata/babihoo11g/redo03.log thread=1 sequence=9
media recovery complete, elapsed time: 00:00:08
Finished recover at 25-FEB-14
恢复之后，就看不到这个自动备份文件了。
RMAN> list backup of controlfile;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
1 Full 9.33M DISK 00:00:07 24-FEB-14
BP Key: 1 Status: AVAILABLE Compressed: NO Tag: TAG20140224T193923
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_24/o1_mf_ncnnf_TAG20140224T193923_9jpcvk7m_.bkp
Control File Included: Ckp SCN: 888738 Ckp time: 24-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
2 Full 9.36M DISK 00:00:03 24-FEB-14
BP Key: 2 Status: AVAILABLE Compressed: NO Tag: TAG20140224T193932
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_24/o1_mf_s_840397172_9jpcvp66_.bkp
Control File Included: Ckp SCN: 888747 Ckp time: 24-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
3 Full 9.33M DISK 00:00:05 25-FEB-14
BP Key: 3 Status: AVAILABLE Compressed: NO Tag: TAG20140225T104551
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T104551_9jr0z3vp_.bkp
Control File Included: Ckp SCN: 912680 Ckp time: 25-FEB-14
RMAN> recover database;
（省略）
List of Cataloged Files
=======================
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T104551_9jr0z3vp_.bkp
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp
（省略）
但是用list backup 命令看不到
之后我又备份了一次控制文件。就是o1_mf_s_840456666_9jr5yv5c_.bkp用来做控制文件恢复实验。
RMAN> list backupset of controlfile;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
5 Full 9.36M DISK 00:00:04 25-FEB-14
BP Key: 5 Status: AVAILABLE Compressed: NO Tag: TAG20140225T120700
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456420_9jr5q6bl_.bkp
Control File Included: Ckp SCN: 914584 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
6 Full 9.33M DISK 00:00:04 25-FEB-14
BP Key: 6 Status: AVAILABLE Compressed: NO Tag: TAG20140225T121059
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T121059_9jr5ypwr_.bkp
Control File Included: Ckp SCN: 914735 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
7 Full 9.36M DISK 00:00:02 25-FEB-14
BP Key: 7 Status: AVAILABLE Compressed: NO Tag: TAG20140225T121106
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456666_9jr5yv5c_.bkp
Control File Included: Ckp SCN: 914745 Ckp time: 25-FEB-14
这次实验没有用自动备份，用的是备份集o1_mf_ncnnf_TAG20140225T121059_9jr5ypwr_.bkp，在恢复的时候也可以看到o1_mf_s_840456666_9jr5yv5c_.bkp。
RMAN> recover database;
（省略）
List of Cataloged Files
=======================
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T121059_9jr5ypwr_.bkp
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840451559_9jr0z96j_.bkp
File Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456666_9jr5yv5c_.bkp
（省略）
但是恢复后打开数据库，却看不到这个自动备份了。
RMAN> alter database open resetlogs;
database opened
RMAN> list backup of controlfile;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
5 Full 9.36M DISK 00:00:04 25-FEB-14
BP Key: 5 Status: AVAILABLE Compressed: NO Tag: TAG20140225T120700
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/autobackup/2014_02_25/o1_mf_s_840456420_9jr5q6bl_.bkp
Control File Included: Ckp SCN: 914584 Ckp time: 25-FEB-14
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
6 Full 9.33M DISK 00:00:00 25-FEB-14
BP Key: 6 Status: AVAILABLE Compressed: NO Tag: TAG20140225T121059
Piece Name: /opt/oracle/flash_recovery_area/BABIHOO11G/backupset/2014_02_25/o1_mf_ncnnf_TAG20140225T121059_9jr5ypwr_.bkp
Control File Included: Ckp SCN: 914735 Ckp time: 25-FEB-14
之前的那次恢复之后，report obsolete也看不到o1_mf_s_840451559_9jr0z96j_.bkp.delete obsolete也没有删除这个文件。这次恢复之后，查看过期的备份也没有这两个文件的任何痕迹。
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
no obsolete backups found
好诡异的说！该怎么解释这种现象呢。
问题2：
RMAN> show controlfile autobackup;
RMAN configuration parameters for database with db_unique_name BABIHOO11G are:
CONFIGURE CONTROLFILE AUTOBACKUP ON;
然后删除一个表空间：
SQL> drop tablespace newts including contents and datafiles;
Tablespace dropped.
可是，等了一天时间，也没有生成一个自动备份的控制文件备份。
NAME VALUE ISDEFAULT ISMOD ISADJ
------------------------------ ------------------------- --------- ---------- -----
_controlfile_autobackup_delay 300 TRUE FALSE FALSE
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