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;