linux下如何恢復(fù)被rm意外刪除數(shù)據(jù)文件

小編給大家分享一下linux下如何恢復(fù)被rm意外刪除數(shù)據(jù)文件，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！

恢復(fù)被rm意外刪除數(shù)據(jù)文件

一.模擬數(shù)據(jù)文件刪除
[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.
  
--數(shù)據(jù)庫版本
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
  
--所有數(shù)據(jù)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
  
--刪除example01.dbf數(shù)據(jù)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: 沒有那個(gè)文件或目錄
  
--因?yàn)閿?shù)據(jù)文件被刪除，創(chuàng)建表失敗
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
二.找回?cái)?shù)據(jù)文件
--查找dbw進(jìn)程spid
[oracle@node1 ~]$ ps -ef|grep dbw|grep -v grep
oracle   18387     1  0 Dec22 ?        00:00:12 ora_dbw0_ora11g
  
--查看該進(jìn)程所有文件句柄
[oracle@node1 ~]$ ll /proc/18387/fd
總計(jì) 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
--通過句柄恢復(fù)數(shù)據(jù)文件[被刪除數(shù)據(jù)文件會(huì)被標(biāo)示(deleted)]
[oracle@node1 ~]$ cp /proc/18387/fd/261 /opt/oracle/oradata/ora11g/example01.dbf
--確認(rèn)該數(shù)據(jù)文件已經(jīng)恢復(fù)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.數(shù)據(jù)文件online
SQL> alter database datafile 5 offline;
  
Database altered.
  
SQL> recover datafile 5;
Media recovery complete.
SQL> alter database datafile 5 online;
  
Database altered.
  
SQL> create table t_xifenfei tablespace example
  2  as select * from dba_tables;
  
Table created.
四.補(bǔ)充說明
在意外使用os命令刪除掉數(shù)據(jù)文件時(shí)，千萬不要慌張重啟數(shù)據(jù)庫或者操作系統(tǒng)，可以通過dbwn進(jìn)程相關(guān)句柄找回?cái)?shù)據(jù)文件

以上是“l(fā)inux下如何恢復(fù)被rm意外刪除數(shù)據(jù)文件”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對大家有所幫助，如果還想學(xué)習(xí)更多知識，歡迎關(guān)注億速云行業(yè)資訊頻道！