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Linux使用rm删除了数据库文件如何恢复?

时间:2021-04-09 来源:来了老弟 人气:

我们都知道Linux中的rm命令可用来删除文件,且删除的文件难以恢复,可是不小心删除了数据库文件,有没有办法恢复呢?别急,下面小编给大家介绍下Linux如何恢复rm删除的数据库文件,一起来了解下吧。

1.首先测试rm 误删除数据库文件

[oracle@primary dbwdn]$ ll

total 2153164

-rw-r----- 1 oracle dba 8536064 Nov 27 21:50 control01.ctl

-rw-r----- 1 oracle dba 8536064 Nov 27 21:50 control02.ctl

-rw-r----- 1 oracle dba 8536064 Nov 27 21:50 control03.ctl

-rw-r----- 1 oracle dba 104865792 Nov 27 21:32 ggs01.dbf

-rw-r----- 1 oracle dba 525344768 Nov 27 21:32 perfstat.dbf

-rw-r----- 1 oracle dba 52429312 Nov 27 21:10 redo01.log

-rw-r----- 1 oracle dba 52429312 Nov 27 21:49 redo02.log

-rw-r----- 1 oracle dba 52429312 Nov 27 21:10 redo03.log

-rw-r----- 1 oracle dba 10493952 Nov 27 21:32 shkz_data_01.dbf

-rw-r----- 1 oracle dba 524296192 Nov 27 21:49 sysaux01.dbf

-rw-r----- 1 oracle dba 524296192 Nov 27 21:49 system01.dbf

-rw-r----- 1 oracle dba 209723392 Nov 18 10:54 temp01.dbf

-rw-r----- 1 oracle dba 52436992 Nov 27 21:32 test01.dbf

-rw-r----- 1 oracle dba 251666432 Nov 27 21:49 undotbs01.dbf

-rw-r----- 1 oracle dba 26222592 Nov 27 21:32 users01.dbf

[oracle@primary dbwdn]$ rm test01.dbf

2.找到数据库后台进程dbw0

oracle 3493 1 0 21:10 ? 00:00:00 ora_dbw0_dbwdn

进程号3493

3.找到被误删除的数据库文件

[oracle@primary dbwdn]$ ll /proc/3493/fd

total 0

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 0 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 1 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 10 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 11 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 12 -》 /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 13 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/hc_dbwdn.dat

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 14 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/lkDBWDN

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 15 -》 /u01/app/oracle/oradata/dbwdn/control01.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 16 -》 /u01/app/oracle/oradata/dbwdn/control02.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 17 -》 /u01/app/oracle/oradata/dbwdn/control03.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 18 -》 /u01/app/oracle/oradata/dbwdn/system01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 19 -》 /u01/app/oracle/oradata/dbwdn/undotbs01.dbf

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 2 -》 /dev/null

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 20 -》 /u01/app/oracle/oradata/dbwdn/sysaux01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 21 -》 /u01/app/oracle/oradata/dbwdn/users01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 22 -》 /u01/app/oracle/oradata/dbwdn/test01.dbf (deleted)

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 23 -》 /u01/app/oracle/oradata/dbwdn/ggs01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 24 -》 /u01/app/oracle/oradata/dbwdn/perfstat.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 25 -》 /u01/app/oracle/oradata/dbwdn/shkz_data_01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 26 -》 /u01/app/oracle/oradata/dbwdn/temp01.dbf

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 27 -》 /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 3 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 21:52 4 -》 /dev/null

l-wx------ 1 oracle oinstall 64 Nov 27 21:52 5 -》 /u01/app/oracle/admin/dbwdn/udump/dbwdn_ora_3485.trc

l-wx------ 1 oracle oinstall 64 Nov 27 21:52 6 -》 /u01/app/oracle/admin/dbwdn/bdump/alert_dbwdn.log

lrwx------ 1 oracle oinstall 64 Nov 27 21:52 7 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/hc_dbwdn.dat

l-wx------ 1 oracle oinstall 64 Nov 27 21:52 8 -》 /u01/app/oracle/admin/dbwdn/bdump/alert_dbwdn.log

误删除之后,数据库没有重启,系统也没用重启

4.拷贝数据库文件

[oracle@primary ~]$ cp /proc/3493/fd/22 /u01/app/oracle/oradata/dbwdn/test01.dbf

[oracle@primary ~]$ cd /u01/app/oracle/oradata/dbwdn

[oracle@primary dbwdn]$ ls

control01.ctl control03.ctl perfstat.dbf redo02.log shkz_data_01.dbf system01.dbf test01.dbf users01.dbf

control02.ctl ggs01.dbf redo01.log redo03.log sysaux01.dbf temp01.dbf undotbs01.dbf

数据库文件找回来了。

5.恢复数据库文件

[oracle@primary dbwdn]$ sqlplus ;/as sysdba;

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Nov 27 21:55:15 2012

Copyright (c) 1982, 2010, Oracle. All Rights Reserved.

Connected to:

 

Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL》 alter database datafile 5 offline;

Database altered.

SQL》 recover datafile 5;

Media recovery complete.

SQL》 alter database datafile 5 online;

Database altered.

SQL》 shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL》 startup

ORACLE instance started.

Total System Global Area 285212672 bytes

Fixed Size 1273276 bytes

Variable Size 130024004 bytes

Database Buffers 150994944 bytes

Redo Buffers 2920448 bytes

Database mounted.

Database opened.

SQL》

成功恢复数据库

注:如果数据库重启之后,还能恢复吗,测试一下:

[oracle@primary dbwdn]$ rm users01.dbf[oracle@primary dbwdn]$ ps -ef |grep dbw0

oracle 3798 1 0 21:56 ? 00:00:00 ora_dbw0_dbwdn

oracle 4147 3439 0 22:07 pts/1 00:00:00 grep dbw0

[oracle@primary dbwdn]$ ll /proc/3798/fd

total 0

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 0 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 1 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 10 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 11 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 12 -》 /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 13 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/hc_dbwdn.dat

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 14 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/lkDBWDN

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 15 -》 /u01/app/oracle/oradata/dbwdn/control01.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 16 -》 /u01/app/oracle/oradata/dbwdn/control02.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 17 -》 /u01/app/oracle/oradata/dbwdn/control03.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 18 -》 /u01/app/oracle/oradata/dbwdn/system01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 19 -》 /u01/app/oracle/oradata/dbwdn/undotbs01.dbf

lr-x------ 1 oracle oinstall 64 Nov 27 22:07 2 -》 /dev/null

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 20 -》 /u01/app/oracle/oradata/dbwdn/sysaux01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 21 -》 /u01/app/oracle/oradata/dbwdn/users01.dbf (deleted)lrwx------ 1 oracle oinstall 64 Nov 27 22:07 22 -》 /u01/app/oracle/oradata/dbwdn/test01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 23 -》 /u01/app/oracle/oradata/dbwdn/ggs01.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 24 -》 /u01/app/oracle/oradata/dbwdn/perfstat.dbf

lrwx------ 1 oracle oinstall 64 Nov 27 22:07 25 -》 /u01/app/oracle/oradata/dbwdn/shkz_data_01.dbf

数据库没有重启,这个数据文件还能恢复,如果我重启数据库之后,还能看见这个数据文件吗?

[oracle@primary dbwdn]$ sqlplus ;/as sysdba;

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Nov 27 22:08:01 2012

Copyright (c) 1982, 2010, Oracle. All Rights Reserved.

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL》 shutdown immediate;

ORA-01116: error in opening database file 4

ORA-01110: data file 4: lsquo;/u01/app/oracle/oradata/dbwdn/users01.dbfrsquo;

ORA-27041: unable to open file

Linux Error: 2: No such file or directory

Additional information: 3

SQL》 shutdown abort;ORACLE instance shut down.

SQL》 exit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@primary dbwdn]$ sqlplus ;/as sysdba;

SQL*Plus: Release 10.2.0.5.0 - Production on Tue Nov 27 22:08:19 2012

Copyright (c) 1982, 2010, Oracle. All Rights Reserved.

Connected to an idle instance.

SQL》 startup

ORACLE instance started.

Total System Global Area 285212672 bytes

Fixed Size 1273276 bytes

Variable Size 130024004 bytes

Database Buffers 150994944 bytes

Redo Buffers 2920448 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 4 - see DBWR trace file

ORA-01110: data file 4: lsquo;/u01/app/oracle/oradata/dbwdn/users01.dbfrsquo;

SQL》 exit

 

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@primary dbwdn]$ ll /proc/3798/fd

ls: /proc/3798/fd: No such file or directory

[oracle@primary dbwdn]$ ps -ef |grep dbw0

oracle 4160 1 0 22:08 ? 00:00:00 ora_dbw0_dbwdn

oracle 4193 3439 0 22:09 pts/1 00:00:00 grep dbw0

[oracle@primary dbwdn]$ ll /proc/4160/fd

total 0

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 0 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 1 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 10 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 11 -》 /dev/zero

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 12 -》 /u01/app/oracle/product/10.2.0/db_1/rdbms/mesg/oraus.msb

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 13 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/hc_dbwdn.dat

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 14 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/lkDBWDN

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 15 -》 /u01/app/oracle/oradata/dbwdn/control01.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 16 -》 /u01/app/oracle/oradata/dbwdn/control02.ctl

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 17 -》 /u01/app/oracle/oradata/dbwdn/control03.ctl

l-wx------ 1 oracle oinstall 64 Nov 27 22:09 2 -》 /u01/app/oracle/admin/dbwdn/bdump/dbwdn_dbw0_4160.trc

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 3 -》 /dev/null

lr-x------ 1 oracle oinstall 64 Nov 27 22:09 4 -》 /dev/null

l-wx------ 1 oracle oinstall 64 Nov 27 22:09 5 -》 /u01/app/oracle/admin/dbwdn/udump/dbwdn_ora_4152.trc

l-wx------ 1 oracle oinstall 64 Nov 27 22:09 6 -》 /u01/app/oracle/admin/dbwdn/bdump/alert_dbwdn.log

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 7 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/hc_dbwdn.dat

l-wx------ 1 oracle oinstall 64 Nov 27 22:09 8 -》 /u01/app/oracle/admin/dbwdn/bdump/alert_dbwdn.log

lrwx------ 1 oracle oinstall 64 Nov 27 22:09 9 -》 /u01/app/oracle/product/10.2.0/db_1/dbs/lkinstdbwdn (deleted)

[oracle@primary dbwdn]$

已经没法恢复了。

说明需要注意的是,rm误删除文件之后,千万不要慌张,稳住神,不要重启数据库,不要重启动系统。

AIX系统,我没有测试过。

使用备份集恢复上面的数据库文件:

[oracle@primary dbwdn]$ rman target /

Recovery Manager: Release 10.2.0.5.0 - Production on Tue Nov 27 22:13:45 2012

Copyright (c) 1982, 2007, Oracle. All rights reserved.

connected to target database (not started)

RMAN》 startup nomount;

Oracle instance started

Total System Global Area 285212672 bytes

Fixed Size 1273276 bytes

Variable Size 130024004 bytes

Database Buffers 150994944 bytes

Redo Buffers 2920448 bytes

RMAN》 alter database mount;

using target database control file instead of recovery catalog

database mounted

RMAN》 run

2》 {

3》 allocate channel t1 type to disk;

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-00558: error encountered while parsing input commands

RMAN-01009: syntax error: found ;to;: expecting one of: ;double-quoted-string, disk, equal, identifier, single-quoted-string;

RMAN-01007: at line 3 column 26 file: standard input

RMAN》 run

2》 {

3》 allocate channel t1 device type disk;

4》 restore datafile 4;

5》 recover datafile 4;

6》 release channel t1;

7》 }

allocated channel: t1

channel t1: sid=156 devtype=DISK

Starting restore at 27-NOV-2012 22:16:26

channel t1: starting datafile backupset restore

channel t1: specifying datafile(s) to restore from backup set

restoring datafile 00004 to /u01/app/oracle/oradata/dbwdn/users01.dbf

channel t1: reading from backup piece /u01/bak/03nrctnp_1_1.bak

channel t1: restored backup piece 1

piece handle=/u01/bak/03nrctnp_1_1.bak tag=TAG20121127T213241

channel t1: restore complete, elapsed time: 00:00:04

Finished restore at 27-NOV-2012 22:16:30

Starting recover at 27-NOV-2012 22:16:30

starting media recovery

media recovery complete, elapsed time: 00:00:01

Finished recover at 27-NOV-2012 22:16:31

released channel: t1

RMAN》 alter database open;

database opened

RMAN》

Windows下数据恢复(把回收站清空后的恢复方法):

步骤:

1、单击;开始mdash;mdash;运行,然后输入regedit (打开注册表)

2、依次展开:HEKEYmdash;mdash;LOCALmdash;mdash;MACHIME/SOFTWARE/microsoft/WINDOWS/ CURRENTVERSION/EXPLORER/DESKTOP/NAMESPACE 在左边空白外点击;新建;

,选择:;主键;,把它命名为;645FFO40mdash;mdash;5081mdash;mdash;101Bmdash;mdash;9F08mdash;mdash;00AA002F954E;

再把右边的;默认;的主键的键值设为;回收站;,然后退出注册表。就OK啦。

3、要重启计算机。

只要机器没有运行过磁盘整理。系统完好。任何时候的文件都可以找回来。

上面就是Linux rm命令删除数据库文件的恢复方法的介绍了,如果你不小心使用rm命令删除了数据库文件,先测试你删除的文件,再进行恢复。

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