ERROR at line 1:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
SQL> select * from v$controlfile;
STATUS NAME IS_ BLOCK_SIZE FILE_SIZE_BLKS
------- -------------------------------------------------- --- ---------- --------------
/u01/oracle/oradata/db01/control01.ctl NO 16384 594
/u01/oracle/oradata/db01/control02.ctl NO 16384 594
/u01/oracle/oradata/db01/control03.ctl NO 16384 594
可以看到，删除了一个控制文件之后，数据库照常运行，甚至在发现一个控制文件丢失之后，数据库实例仍然处于打开状态，检查一下alert文件：
Thread 1 advanced to log sequence 21 (LGWR switch)
Current log# 3 seq# 21 mem# 0: /u01/oracle/oradata/db01/redo03.log
Sun May 24 13:00:58 2009
Errors in file /u01/oracle/diag/rdbms/db01/db01/trace/db01_m002_27935.trc:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
Sun May 24 13:24:09 2009
Errors in file /u01/oracle/diag/rdbms/db01/db01/trace/db01_m000_27986.trc:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
Sun May 24 14:01:49 2009
Errors in file /u01/oracle/diag/rdbms/db01/db01/trace/db01_m002_28082.trc:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
Sun May 24 14:24:59 2009
Errors in file /u01/oracle/diag/rdbms/db01/db01/trace/db01_m000_28132.trc:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
Sun May 24 14:59:29 2009
Errors in file /u01/oracle/diag/rdbms/db01/db01/trace/db01_m000_28204.trc:
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u01/oracle/oradata/db01/control02.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3
虽然Oracle认识到一个控制文件出现了异常，但是Oracle并没有关闭当前实例。测试发现，即使删除了所有当前的控制文件，当前实例依然处于打开的状态，并且只有需要访问控制文件的操作会报错，其他操作仍然可以运行。
Oracle既然不会自动关闭，那么万一出现了控制文件误删除的情况，一定不要手工关闭当前的实例，只要实例不关闭，就可以轻松的查询数据库中的数据文件、日志文件等信息来重建控制文件，而一旦关闭了实例，由于缺失控制文件，实例将无法启动，这时候要找到所有控制文件中包含的信息就比较困难了。
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