歸檔模式下，恢復沒有備份的數據文件

1、確認庫裏現有的數據文件

SQL> select file_name from dba_data_files;

FILE_NAME
--------------------------------------------------------------------------------
/data/corcl/users01.dbf
/data/corcl/sysaux01.dbf
/data/corcl/undotbs01.dbf
/data/corcl/system01.dbf

/data/corcl/oa.dbf

2、創建新的表空間

SQL>create tablespace zhengye datafile '/data/corcl/zhengye.dbf' size 100m;

Tablespace created.

3、創建新用戶並賦予權限

SQL>create user zhengye identified by zhengye default tablespace zhengye;

User created.

SQL>grant connect,resource to zhengye;

Grant succeeded.

4、使用新用戶創建測試表

SQL> show user;
USER is "ZHENGYE"

SQL> create table zhengye (id number(20));

Table created.

SQL> insert into zhengye values(88);

1 row created.

SQL> commit;

Commit complete.

SQL> insert into zhengye select * from zhengye;

1 row created.

SQL> select count(*) from zhengye;


  COUNT(*)
----------
        32

5、使用sys用戶切換日誌

SQL> alter system switch logfile;

System altered.

SQL> /

System altered.

6、刪除新建的數據文件

rm -rf  /data/corcl/zhengye.dbf

7、關閉數據庫

SQL> shutdown immediate
ORA-01116: error in opening database file 6
ORA-01110: data file 6: '/data/corcl/zhengye.dbf'
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3

SQL> shutdown abort
ORACLE instance shut down.

8、啓動到mount重建丟失的數據文件
SQL> startup mount;
ORACLE instance started.

SQL> alter database create datafile 6;


Database altered.


SQL> select name from v$datafile;


NAME
--------------------------------------------------------------------------------
/data/corcl/system01.dbf
/data/corcl/undotbs01.dbf
/data/corcl/sysaux01.dbf
/data/corcl/users01.dbf
/data/corcl/oa.dbf
/data/corcl/zhengye.dbf


6 rows selected.

9、恢復數據文件

SQL> recover datafile 6;
ORA-00279: change 2939247 generated at 12/30/2014 10:02:49 needed for thread 1
ORA-00289: suggestion : /data/arch/1_79_861708973.dbf
ORA-00280: change 2939247 for thread 1 is in sequence #79




Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
Log applied.
Media recovery complete.
SQL> alter database open;


Database altered.

10、檢查表數據，可以看到數據恢復了
SQL> select count(*) from zhengye.zhengye;


  COUNT(*)
----------
        32