oracle删除redo 未重启,Oracle 误删控制文件,oracle 数据库没重启的情况下,怎么恢复？...

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kaohongshu

2016.05.15

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Linux 平台误删 oracle 数据文件的恢复方法

模拟误操作：

数据库在正常运行,人工直接rm 掉了数据文件。

--1.测试环境情况:

$ cat /etc/redhat-release

CentOS release 6.5 (Final)

select file_name from dba_data_files;

/u01/app/oracle/oradata/orcl/test.dbf

$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on 星期四 3月 5 15:55:14 2015

Copyright (c) 1982, 2013, Oracle. All rights reserved.

连接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

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

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

开启数据库归档

archive log list;

数据库日志模式 非存档模式

自动存档 禁用

存档终点 USE_DB_RECOVERY_FILE_DEST

最早的联机日志序列 3002

当前日志序列 3004

mkdir /u01/arch

alter system set log_archive_dest_1='location=/u01/arch' scope=spfile;

SQL> shutdown immediate

数据库已经关闭。

已经卸载数据库。

ORACLE 例程已经关闭。

SQL> startup mount;

ORACLE 例程已经启动。

Total System Global Area 1.0088E+10 bytes

Fixed Size 2261928 bytes

Variable Size 1644170328 bytes

Database Buffers 8422162432 bytes

Redo Buffers 19595264 bytes

数据库装载完毕。

SQL> alter database archivelog;

数据库已更改。

SQL> archive log list;

数据库日志模式 存档模式

自动存档 启用

存档终点 /u01/arch

最早的联机日志序列 3002

下一个存档日志序列 3004

当前日志序列 3004

SQL> alter database open;

数据库已更改。

SQL> select open_mode from v$database;

OPEN_MODE

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

READ WRITE

--2.新建测试数据

select file_name from dba_data_files;

FILE_NAME

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

/u01/app/oracle/oradata/orcl/users01.dbf

SQL> create tablespace wind datafile '/u01/app/oracle/oradata/orcl/wind01.dbf' size 200m;

SQL> create user wind identified by wind01 default tablespace wind;

SQL> grant connect,resource,dba to wind;

$ sqlplus wind/wind01

create table t1

(

sid int not null primary key,

sname varchar2(10)

)

tablespace wind;

--循环导入数据

declare

maxrecords constant int:=100000;

i int :=1;

begin

for i in 1..maxrecords loop

insert into t1 values(i,'ocpyang');

end loop;

dbms_output.put_line(' 成功录入数据！ ');

commit;

end;

/

select count(*) from t1;

COUNT(*)

----------

100000

--3.模拟删除数据

SQL> col tablespace_name for a20

SQL> select tablespace_name,status from dba_tablespaces;

TABLESPACE_NAME STATUS

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

SYSTEM ONLINE

SYSAUX ONLINE

UNDOTBS1 ONLINE

TEMP ONLINE

USERS ONLINE

TTSPACE ONLINE

OCPYANG ONLINE

OCPYANGINDEX ONLINE

LOBOCPYANG ONLINE

LOBOCPYANG01 ONLINE

LOBOCPYANG02 ONLINE

TABLESPACE_NAME STATUS

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

WIND ONLINE

rm -rf /u01/app/oracle/oradata/orcl/wind01.dbf

ls /u01/app/oracle/oradata/orcl/ | grep wind

SQL> show user;

USER 为 "WIND"

SQL> select count(*) from t1;

COUNT(*)

----------

100000

SQL> desc t1

名称 是否为空? 类型

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

SID NOT NULL NUMBER(38)

SNAME VARCHAR2(10)

SQL> delete from t1 where sid>99000;

已删除1000行。

SQL> commit;

提交完成。

SQL> select count(*) from t1;

COUNT(*)

----------

99000

--4.恢复

ps -eaf|grep dbw0 |grep -v grep

oracle 1928 1 0 15:59 ? 00:00:00 ora_dbw0_orcl

SQL> col tablespace_name for a20

SQL> select tablespace_name,status from dba_tablespaces;

TABLESPACE_NAME STATUS

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

SYSTEM ONLINE

SYSAUX ONLINE

UNDOTBS1 ONLINE

TEMP ONLINE

USERS ONLINE

TTSPACE ONLINE

OCPYANG ONLINE

OCPYANGINDEX ONLINE

LOBOCPYANG ONLINE

LOBOCPYANG01 ONLINE

LOBOCPYANG02 ONLINE

TABLESPACE_NAME STATUS

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

WIND ONLINE

cd /proc/1928/fd

ll

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 0 -> /dev/null

l-wx------ 1 oracle oinstall 64 Mar 5 16:20 1 -> /dev/null

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 10 -> /u01/app/oracle/product/11.2.0/db_1/dbs/lkORCL

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 11 -> /u01/app/oracle/product/11.2.0/db_1/rdbms/mesg/oraus.msb

l-wx------ 1 oracle oinstall 64 Mar 5 16:20 2 -> /dev/null

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 256 -> /u01/app/oracle/oradata/orcl/control01.ctl

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 257 -> /u01/app/oracle/fast_recovery_area/orcl/control02.ctl

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 258 -> /u01/app/oracle/oradata/orcl/system01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 259 -> /u01/app/oracle/oradata/orcl/sysaux01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 260 -> /u01/app/oracle/oradata/orcl/undotbs01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 261 -> /u01/app/oracle/oradata/orcl/users01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 262 -> /u01/app/oracle/oradata/orcl/ttspace01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 263 -> /u01/app/oracle/oradata/orcl/ocpyang01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 264 -> /u01/app/oracle/oradata/orcl/ocpyangindex01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 265 -> /u01/app/oracle/oradata/orcl/lobocpyang01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 266 -> /u01/app/oracle/oradata/orcl/lobocpyang0101.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 267 -> /u01/app/oracle/oradata/orcl/lobocpyang0202.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 268 -> /u01/app/oracle/oradata/orcl/temp01.dbf

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 269 -> /u01/app/oracle/oradata/orcl/wind01.dbf (deleted) --注

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 3 -> /dev/null

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 4 -> /dev/null

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 5 -> /dev/null

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 6 -> /u01/app/oracle/product/11.2.0/db_1/rdbms/mesg/oraus.msb

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 7 -> /proc/1928/fd

lr-x------ 1 oracle oinstall 64 Mar 5 16:20 8 -> /dev/zero

lrwx------ 1 oracle oinstall 64 Mar 5 16:20 9 -> /u01/app/oracle/product/11.2.0/db_1/dbs/hc_orcl.dat

直接cp该句柄文件名回原位置：

$ pwd

/proc/1928/fd

cp /proc/1928/fd/269 /u01/app/oracle/oradata/orcl/wind01.dbf

NOTE:

由于数据库一直是打开使用的，数据在不断变更则SCN也会不断的变化，

cp数据文件和数据库当前的信息明显不一致，此时需要对数据文件进行recover.

--脱机数据文件

alter database datafile '/u01/app/oracle/oradata/orcl/wind01.dbf' offline;

select count(*) from t1;

第 1 行出现错误:

ORA-00376: 此时无法读取文件 11

ORA-01110: 数据文件 11: '/u01/app/oracle/oradata/orcl/wind01.dbf'

--恢复数据文件

recover datafile '/u01/app/oracle/oradata/orcl/wind01.dbf';

--联机数据文件

alter database datafile '/u01/app/oracle/oradata/orcl/wind01.dbf' online;

select count(*) from t1;

COUNT(*)

----------

99000

成功恢复.

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