探索Oracle不完全恢复之--基于备份控制文件恢复

基于备份控制文件（unsing backup controlfile）的恢复

主要适用于：基于备份控制文件的恢复只要适用于以下情况：表空间被意外删除；所有控制文件全部损坏。

1、关闭数据库执行一次全库冷备份：

SQL> select file_name from dba_data_files;

FILE_NAME

--------------------------------------------------------------------------------

/DBBak2/oradata/WWL/users01.dbf

/DBBak2/oradata/WWL/sysaux01.dbf

/DBBak2/oradata/WWL/undotbs01.dbf

/DBBak2/oradata/WWL/system01.dbf

/DBBak2/oradata/WWL/WWL001.dbf

/DBBak2/oradata/WWL/WWL002.dbf

/DBBak2/oradata/WWL/WWL003.dbf

7 rowsselected.

SQL> shutdown immediate

Databaseclosed.

Databasedismounted.

Oracleinstance shut down.

SQL> !mkdir /DBBak2/oradata/WWL2

SQL> !cp /DBBak2/oradata/WWL/* /DBBak2/oradata/WWL2/

通过如上的操作数据库现在已经有了一个冷备份了，里面包含另外wwl表空间，现在模拟用户误删除了wwl表空间。

SQL> startup

ORACLEinstance started.

TotalSystem Global Area  100663296 bytes

FixedSize                  1217884 bytes

VariableSize              88083108 bytes

DatabaseBuffers            8388608 bytes

RedoBuffers                2973696 bytes

Databasemounted.

Databaseopened.

SQL>

模拟删除表空间

SQL> drop tablespace wwl including contents;

Tablespacedropped.

    当前的控制文件中已经不包含wwl表空间了，但是我们之前冷备份的控制文件中还是包含的，所以必须使用以前的控制文件来进行wwl表空间的恢复。

还原之前备份的数据文件：

SQL> shutdown immediate

Databaseclosed.

Databasedismounted.

ORACLEinstance shut down.

SQL> !rm -rf /DBBak2/oradata/WWL/*.dbf

SQL> !rm -rf /DBBak2/oradata/WWL/*.ctl

SQL> !cp /DBBak2/oradata/WWL2/*.dbf /DBBak2/oradata/WWL/

SQL> !cp /DBBak2/oradata/WWL2/*.ctl /DBBak2/oradata/WWL/

SQL> 

使用控制文件进行恢复：

SQL> startup

ORACLEinstance started.

TotalSystem Global Area  100663296 bytes

FixedSize                  1217884 bytes

VariableSize              88083108 bytes

DatabaseBuffers            8388608 bytes

RedoBuffers                2973696 bytes

Databasemounted.

ORA-00338:log 5 of thread 1 is more recent than control file

ORA-00312:online log 5 thread 1: '/DBBak2/oradata/WWL/redo5a.log'

ORA-00312:online log 5 thread 1: '/DBBak2/oradata/WWL/redo5b.log'

SQL> recover database using backup controlfile until cancel;

ORA-00279:change 1782560 generated at 07/31/2012 14:37:24 needed for thread 1

ORA-00289:suggestion : /DBSoft/product/10.2.0/db_1/dbs/arch/1_3_790085314.dbf

ORA-00280:change 1782560 for thread 1 is in sequence #3

Specifylog: {<RET>=suggested | filename | AUTO | CANCEL}

cancel

Mediarecovery cancelled.

SQL> alter database open resetlogs;

Databasealtered.

SQL>

至此已经恢复成功。

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