一.模拟数据文件删除
[oracle@node1 ~]$ sqlplus /
as
sysdba
SQL*Plus: Release 11.2.0.3.0 Production
on
Sat
Dec
31 22:00:52 2011
Copyright (c) 1982, 2011, Oracle.
All
rights reserved.
--数据库版本
Connected
to
:
Oracle
Database
11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With
the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle
Database
Vault
and
Real
Application Testing options
--所有数据文件
SQL>
select
name
from
v$datafile;
NAME
--------------------------------------------------------------------------------
/opt/oracle/oradata/ora11g/system01.dbf
/opt/oracle/oradata/ora11g/sysaux01.dbf
/opt/oracle/oradata/ora11g/undotbs01.dbf
/opt/oracle/oradata/ora11g/users01.dbf
/opt/oracle/oradata/ora11g/example01.dbf
--删除example01.dbf数据文件
SQL> !rm /opt/oracle/oradata/ora11g/example01.dbf
SQL> !ls -l /opt/oracle/oradata/ora11g/example01.dbf
ls: /opt/oracle/oradata/ora11g/example01.dbf: 没有那个文件或目录
--因为数据文件被删除，创建表失败
SQL>
create
table
t_xifenfei tablespace example
2
as
select
*
from
dba_tables;
as
select
*
from
dba_tables
*
ERROR
at
line 2:
ORA-01116: error
in
opening
database
file 5
ORA-01110: data file 5:
'/opt/oracle/oradata/ora11g/example01.dbf'
ORA-27041: unable
to
open
file
Linux-x86_64 Error: 2:
No
such file
or
directory
Additional information: 3
--被删除数据文件离线
SQL>
alter
database
datafile 5 offline;
Database
altered.
|
二.找回数据文件
--查找dbw进程spid
[oracle@node1 ~]$
ps
-ef|
grep
dbw|
grep
-
v
grep
oracle 18387 1 0 Dec22 ? 00:00:12 ora_dbw0_ora11g
--查看该进程所有文件句柄
[oracle@node1 ~]$ ll
/proc/18387/fd
总计 0
lr-x------ 1 oracle oinstall 64 12-31 22:03 0 ->
/dev/null
l-wx------ 1 oracle oinstall 64 12-31 22:03 1 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 10 ->
/dev/zero
lr-x------ 1 oracle oinstall 64 12-31 22:03 11 ->
/dev/zero
lr-x------ 1 oracle oinstall 64 12-31 22:03 12 ->
/opt/oracle/product/11
.2.0
/db_1/rdbms/mesg/orazhs
.msb
lrwx------ 1 oracle oinstall 64 12-31 22:03 13 ->
/opt/oracle/product/11
.2.0
/db_1/dbs/hc_ora11g
.dat
lr-x------ 1 oracle oinstall 64 12-31 22:03 14 ->
/proc/18387/fd
lr-x------ 1 oracle oinstall 64 12-31 22:03 15 ->
/dev/zero
lr-x------ 1 oracle oinstall 64 12-31 22:03 16 ->
/opt/oracle/product/11
.2.0
/db_1/rdbms/mesg/oraus
.msb
lrwx------ 1 oracle oinstall 64 12-31 22:03 17 ->
/opt/oracle/product/11
.2.0
/db_1/dbs/hc_ora11g
.dat
lrwx------ 1 oracle oinstall 64 12-31 22:03 18 ->
/opt/oracle/product/11
.2.0
/db_1/dbs/lkORA11G
lr-x------ 1 oracle oinstall 64 12-31 22:03 19 ->
/opt/oracle/product/11
.2.0
/db_1/rdbms/mesg/orazhs
.msb
l-wx------ 1 oracle oinstall 64 12-31 22:03 2 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 20 ->
/opt/oracle/product/11
.2.0
/db_1/rdbms/mesg/oraus
.msb
lrwx------ 1 oracle oinstall 64 12-31 22:03 21 -> socket:[441562]
lrwx------ 1 oracle oinstall 64 12-31 22:03 256 ->
/opt/oracle/oradata/ora11g/control01
.ctl
lrwx------ 1 oracle oinstall 64 12-31 22:03 257 ->
/opt/oracle/oradata/ora11g/system01
.dbf
lrwx------ 1 oracle oinstall 64 12-31 22:03 258 ->
/opt/oracle/oradata/ora11g/sysaux01
.dbf
lrwx------ 1 oracle oinstall 64 12-31 22:03 259 ->
/opt/oracle/oradata/ora11g/undotbs01
.dbf
lrwx------ 1 oracle oinstall 64 12-31 22:03 260 ->
/opt/oracle/oradata/ora11g/users01
.dbf
lrwx------ 1 oracle oinstall 64 12-31 22:03 261 ->
/opt/oracle/oradata/ora11g/example01
.dbf (deleted)
lrwx------ 1 oracle oinstall 64 12-31 22:03 262 ->
/opt/oracle/oradata/ora11g/temp01
.dbf
lr-x------ 1 oracle oinstall 64 12-31 22:03 3 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 4 ->
/dev/null
lrwx------ 1 oracle oinstall 64 12-31 22:03 5 ->
/opt/oracle/product/11
.2.0
/db_1/dbs/hc_ora11g
.dat
lr-x------ 1 oracle oinstall 64 12-31 22:03 6 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 7 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 8 ->
/dev/null
lr-x------ 1 oracle oinstall 64 12-31 22:03 9 ->
/dev/null
--通过句柄恢复数据文件[被删除数据文件会被标示(deleted)]
[oracle@node1 ~]$
cp
/proc/18387/fd/261
/opt/oracle/oradata/ora11g/example01
.dbf
--确认该数据文件已经恢复成功
[oracle@node1 ~]$ ll
/opt/oracle/oradata/ora11g/example01
.dbf
-rw-r----- 1 oracle oinstall 362422272 12-31 22:05
/opt/oracle/oradata/ora11g/example01
.dbf
|
三.数据文件online
--恢复数据文件
SQL> recover datafile 5;
Media recovery complete.
--数据文件online
SQL>
alter
database
datafile 5 online;
Database
altered.
--创建表测试
SQL>
create
table
t_xifenfei tablespace example
2
as
select
*
from
dba_tables;
Table
created.
|
四.补充说明
在意外使用os命令删除掉数据文件时，千万不要慌张重启数据库或者操作系统，可以通过dbwn进程相关句柄找回数据文件
如果是unix系统，可能需要先通过lsof找到句柄，然后通过cp实现
[root@node1 ~]
# lsof -p 18387 |grep deleted
oracle 18387 oracle 261uW REG 8,6 362422272 13598733
/opt/oracle/oradata/ora11g/example01
.dbf (deleted)
cd
/proc/18387
/fd/
cp
261
/opt/oracle/oradata/ora11g/example01
.dbf