恢复被rm意外删除的数据文件

千家信息网最后更新 2024年11月20日恢复被rm意外删除的数据文件

一.模拟数据文件删除

[oracle@node1 ~]$ sqlplus /as sysdba SQL*Plus: Release 11.2.0.3.0 Productionon Sat Dec31 22:00:52 2011 Copyright (c) 1982, 2011, Oracle. All rights reserved. --数据库版本 Connected to: Oracle Database11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, Oracle Label Security, OLAP, Data Mining, Oracle DatabaseVault and Real Application Testing options --所有数据文件 SQL> selectname 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> createtable t_xifenfei tablespace example 2 as select* from dba_tables; as select * fromdba_tables * ERROR atline 2: ORA-01116: error in opening databasefile 5 ORA-01110: data file 5:'/opt/oracle/oradata/ora11g/example01.dbf' ORA-27041: unableto open file Linux-x86_64 Error: 2:No such file or directory Additional information: 3

二.找回数据文件
--查找dbw进程spid [oracle@node1 ~]$ ps -ef|grepdbw|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
SQL> alterdatabase datafile 5 offline; Database altered.
SQL> recover datafile 5; Media recovery complete.
SQL> alterdatabase datafile 5 online; Database altered.
SQL> createtable 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@xifenfei ~]# tar xjf lsof_4.86.tar.bz2 [root@xifenfei lsof_4.86]# tar xvf lsof_4.86_src.tar [root@xifenfei lsof_4.86_src]# ./Configure No target dialect was specified. Usage: Configure : -clean : clean up previous configuration -d|-dialects : display a list of supported dialect versions -h|-help : display help information -n : avoid AFS, customization, and inventory checks (****USE -d TO GET TESTED DIALECT VERSION NUMBERS****): aix|aixgcc : IBM AIX xlc (aix) or gcc (aixgcc) darwin : Apple Darwin decosf : DEC OSF/1 digital_unix|du : Digital UNIX freebsd : FreeBSD hpux|hpuxgcc : HP-UX cc (hpux) or gcc (hpuxgcc) linux : Linux netbsd : NetBSD nextstep|next|ns|nxt : NEXTSTEP openbsd : OpenBSD openstep|os : OPENSTEP osr|sco : SCO OpenServer < 6.0.0, SCO devloper's compiler osrgcc|scogcc : SCO OpenServer < 6.0.0, gcc compiler osr6 : SCO OpenServer 6.0.0, SCO compiler solaris|solariscc : Solaris gcc (solaris) or cc (solariscc) tru64 : Tru64 UNIX unixware|uw : SCO|Caldera UnixWare [root@xifenfei lsof_4.86_src]# ./Configure linux [root@xifenfei lsof_4.86_src]# make [root@xifenfei lsof_4.86_src]# make install