归档模式下，恢复没有备份的数据文件

1、确认库里现有的数据文件

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、创建新的表空间

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

Tablespace created.

3、创建新用户并赋予权限

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

User created.

SQL>grant connect,resource to zhengye;

Grant succeeded.

4、使用新用户创建测试表

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用户切换日志

SQL> alter system switch logfile;

System altered.

SQL> /

System altered.

6、删除新建的数据文件

rm -rf /data/corcl/zhengye.dbf

7、关闭数据库

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、启动到mount重建丢失的数据文件

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、恢复数据文件

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、检查表数据，可以看到数据恢复了

SQL> select count(*) from zhengye.zhengye;

COUNT(*)

----------

32