場(chǎng)景：

1.數(shù)據(jù)庫(kù)開(kāi)啟歸檔；

2.創(chuàng)建數(shù)據(jù)文件之后的所有歸檔日志都在線(xiàn)；

3.數(shù)據(jù)文件或者表空間沒(méi)有進(jìn)行過(guò)備份，數(shù)據(jù)庫(kù)也沒(méi)有全庫(kù)備份,數(shù)據(jù)文件異常丟失；

步驟：

創(chuàng)建測(cè)試用的表空間：

SQL> create tablespace bbb datafile '/opt/Oracle/oradata/R11203/bbb.dbf' size 100m;

SQL> create table test_b (id number(10)) tablespace bbb;

SQL> insert into test_b values (1);

SQL> commit;

SQL>select name,file# from v$datafile;

NAME? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? FILE#

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

/opt/oracle/oradata/R11203/aaa.dbf? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 10

/opt/oracle/oradata/R11203/bbb.dbf? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 11

11 rows selected.

SQL> host

刪除數(shù)據(jù)文件,模擬異常丟失

bash-4.2$ ls -al /opt/oracle/oradata/R11203/bbb.dbf

-rw-rw----? 1 oracle? ? dba? ? ? ? 10493952 Apr? 4 09:53? /opt/oracle/oradata/R11203/bbb.dbf

bash-4.2$ mv /opt/oracle/oradata/R11203/bbb.dbf? /opt/oracle/oradata/R11203/bbb.dbf.bak

bash-4.2$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Fri Apr 409:55:03 2014

Copyright (c) 1982, 2011, Oracle.? All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 -64bit Production

With the Partitioning, OLAP, Data Mining and Real

Application Testing options

SQL> alter tablespace bbb read only;

alter tablespace bbb read only

*

ERROR at line 1:

ORA-01116: error in opening database file 11

ORA-01110: data file 11:

'/opt/oracle/oradata/R11203/bbb.dbf'

ORA-27041: unable to open file

HPUX-ia64 Error: 2: No such file or directory

Additional information: 3

SQL> shutdown immediate;

ORA-01116: error in opening database file 11

ORA-01110: data file 11:

'/opt/oracle/oradata/R11203/bbb.dbf'

ORA-27041: unable to open file

HPUX-ia64 Error: 2: No such file or directory

Additional information: 3

SQL> select status from v$instance;

STATUS

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

OPEN

SQL> alter system switch logfile;

System altered.

SQL> /

System altered.

SQL> /

System altered.

SQL>/

System altered.

SQL> /

System altered.

SQL> /

System altered.

SQL>

停機(jī)

SQL> shutdown immediate;

ORA-01116: error in opening database file 11

ORA-01110: data file 11:

'/opt/oracle/oradata/R11203/bbb.dbf'

ORA-27041: unable to open file

HPUX-ia64 Error: 2: No such file or directory

Additional information: 3

SQL> shutdown abort;

ORACLE instance shut down.

把數(shù)據(jù)庫(kù)啟動(dòng)到mount狀態(tài)

SQL> startup mount;

ORACLE instance started.

Total System Global Area? 329859072 bytes

FixedSize? ? ? ? ? ? ? ? 2182336 bytes

VariableSize? ? ? ? ? ? 285213504 bytes

DatabaseBuffers? ? ? ? ? 37748736bytes

RedoBuffers? ? ? ? ? ? ? 4714496 bytes

Database mounted.

使用alter database create datafile <> as ....的方式，重建這個(gè)丟失的數(shù)據(jù)文件：

SQL> alter database create datafile 11;

Database altered.

通過(guò)歸檔日志和redo log對(duì)數(shù)據(jù)文件進(jìn)行恢復(fù)

SQL> recover datafile 11;

Media recovery complete.

SQL> alter database open;

Database altered.

SQL> select * from test_b;

ID

----------

1

總結(jié)

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