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—————————————
查看snapshot controlfile的备份设置:
RMAN> SHOW SNAPSHOT CONTROLFILE NAME;

RMAN configuration parameters are:
CONFIGURE SNAPSHOT CONTROLFILE NAME TO ‘/u01/ora9a/product/9.2/dbs/snapcf_tt9a.f’; # default

RMAN>

下面模拟控制文件丢失的恢复
$ ls
control01.ctl cwmlite01.dbf indx01.dbf redo02.log temp01.dbf users01.dbf
control02.ctl drsys01.dbf odm01.dbf redo03.log tools01.dbf xdb01.dbf
control03.ctl example01.dbf redo01.log system01.dbf undotbs01.dbf
$ rm cont* –删除控制文件
$ ls
cwmlite01.dbf example01.dbf odm01.dbf redo02.log system01.dbf tools01.dbf users01.dbf
drsys01.dbf indx01.dbf redo01.log redo03.log temp01.dbf undotbs01.dbf xdb01.dbf
$
在控制文件被删除后，数据库还能正常操作：
SQL> insert into test(no) values(4);

1 row created.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> alter system checkpoint;

System altered.

SQL> /

System altered.

SQL>
SQL> select no,to_char(vdate,’yyyy-mm-dd hh24:mi:ss’) from test;

NO TO_CHAR(VDATE,’YYYY-MM-DDHH24:MI:SS’)
———- ———————————————————
1 2009-02-24 10:16:09
2 2009-02-24 10:25:30
3 2009-02-24 10:26:56
4 2009-02-24 10:30:59

SQL>
重新启动数据库：
SQL> connect /as sysdba
Connected.
SQL> shutdown immediate
ORA-00210: cannot open the specified controlfile
ORA-00202: controlfile: ‘/u01/ora9a/oradata/tt9a/control01.ctl’
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 2: No such file or directory
Additional information: 3
没有了控制文件了，shutdown immediate出错
SQL>
SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

SQL>
没有控制文件，数据库不能mount，现在把SNAPSHOT CONTROLFILE copy到对应目录
$ cp /u01/ora9a/product/9.2/dbs/snapcf_tt9a.f /u01/ora9a/oradata/tt9a/control01.ctl
$ cp /u01/ora9a/oradata/tt9a/control01.ctl /u01/ora9a/oradata/tt9a/control0t.ctl
$ cp /u01/ora9a/oradata/tt9a/control01.ctl /u01/ora9a/oradata/tt9a/control03.ctl
$ ls -lrt /u01/ora9a/oradata/tt9a/contr*
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control01.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control0t.ctl
-rw-r—– 1 ora9a dba 1531904 Feb 24 10:36 /u01/ora9a/oradata/tt9a/control03.ctl
$
SQL> startup
ORACLE instance started.

Total System Global Area 320569400 bytes
Fixed Size 741432 bytes
Variable Size 285212672 bytes
Database Buffers 33554432 bytes
Redo Buffers 1060864 bytes
ORA-00205: error in identifying controlfile, check alert log for more info
照样不能mount数据库
—————————————-
尝试用rman恢复控制文件:
$ rman target /

Recovery Manager: Release 9.2.0.1.0 – 64bit Production

connected to target database (not started)

RMAN> startup nomount;

Oracle instance started

Total System Global Area 320569400 bytes

Fixed Size 741432 bytes
Variable Size 285212672 bytes
Database Buffers 33554432 bytes
Redo Buffers 1060864 bytes

RMAN> restore controlfile from ‘/u01/ora9a/product/9.2/dbs/snapcf_tt9a.f’;

Starting restore at 24-FEB-09

using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=13 devtype=DISK
channel ORA_DISK_1: copied controlfile copy
replicating controlfile
input filename=/u01/ora9a/oradata/tt9a/control01.ctl
output filename=/u01/ora9a/oradata/tt9a/control02.ctl
output filename=/u01/ora9a/oradata/tt9a/control03.ctl
Finished restore at 24-FEB-09

RMAN> alter database mount;

database mounted

RMAN>
ok,用rman可以进行恢复，让数据mount起来
恢复数据库
RMAN> recover database;

Starting recover at 24-FEB-09
using channel ORA_DISK_1

starting media recovery

archive log thread 1 sequence 1 is already on disk as file /u01/ora9a/oradata/tt9a/redo01.log
archive log thread 1 sequence 2 is already on disk as file /u01/ora9a/oradata/tt9a/redo02.log
archive log thread 1 sequence 3 is already on disk as file /u01/ora9a/oradata/tt9a/redo03.log
archive log filename=/u01/ora9a/oradata/tt9a/redo01.log thread=1 sequence=0
archive log filename=/u01/ora9a/oradata/tt9a/redo02.log thread=1 sequence=2
archive log filename=/u01/ora9a/oradata/tt9a/redo03.log thread=1 sequence=3
media recovery complete
Finished recover at 24-FEB-09

RMAN> alter database open;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of alter db command at 02/24/2009 10:47:36
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open

RMAN> alter database open resetlogs;

database opened

RMAN>
查看先前insert的数据：
SQL> select no,to_char(vdate,’yyyy-mm-dd hh24:mi:ss’) from test;

SQL>
数据仍在，恢复成功!

=============================
下面仍是在数据库正常运行情况下，将控制文件删除，仍测试直接copy SNAPSHOT CONTROLFILE 的恢复方式：
SQL> insert into test(no) values(5);

1 row created.

SQL> commit;

Commit complete.

SQL>
SQL> !
$ pwd
/u01/ora9a/oradata/tt9a
$ ls
control01.ctl control0t.ctl example01.dbf redo01.log system01.dbf undotbs01.dbf
control02.ctl cwmlite01.dbf indx01.dbf redo02.log temp01.dbf users01.dbf
control03.ctl drsys01.dbf odm01.dbf redo03.log tools01.dbf xdb01.dbf
$ rm contr*
$ ls
cwmlite01.dbf example01.dbf odm01.dbf redo02.log system01.dbf tools01.dbf users01.dbf
drsys01.dbf indx01.dbf redo01.log redo03.log temp01.dbf undotbs01.dbf xdb01.dbf
$
$ exit

SQL> select * from v$controlfile;

STATUS
———————
NAME
——————————————————————————–

/u01/ora9a/oradata/tt9a/control01.ctl
/u01/ora9a/oradata/tt9a/control02.ctl
/u01/ora9a/oradata/tt9a/control03.ctl
SQL> select dbid from v$database;
select dbid from v$database
*
ERROR at line 1:
ORA-00210: cannot open the specified controlfile
ORA-00202: controlfile: ‘/u01/ora9a/oradata/tt9a/control01.ctl’
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 2: No such file or directory
Additional information: 3

SQL>
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