Oracle数据文件物理删除后的恢复

opijoiu

做系统管理的都是这样，难免会误删文件，某天要是把某个Oracle数据文件删除，那该如何恢复呢？(这里数据库是OPEN的，并且未关闭)

• 建立测试表空间
  
• 创建测试用户
  
• 插入测试数据
  
• 删除数据文件
  
• 恢复数据库文件
  
  

• 建立测试表空间
  
  
  

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SQL> select name from v$datafile; NAME -------------------------------------------------------------------------------- /opt/oracle/oradata/member/system01.dbf /opt/oracle/oradata/member/sysaux01.dbf /opt/oracle/oradata/member/undotbs01.dbf /opt/oracle/oradata/member/users01.dbf SQL> create tablespace test datafile '/opt/oracle/oradata/member/test01.dbf' size 10m; Tablespace created. SQL> select name from v$datafile; NAME -------------------------------------------------------------------------------- /opt/oracle/oradata/member/system01.dbf /opt/oracle/oradata/member/sysaux01.dbf /opt/oracle/oradata/member/undotbs01.dbf /opt/oracle/oradata/member/users01.dbf /opt/oracle/oradata/member/test01.dbf

2.创建测试账户

1 2	SQL> create user test identified by test default tablespace test; SQL> grant connect,resource to test;

3.插入测试数据

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SQL> conn test/test SQL> create table t1(id int); SQL> insert into t1 values(1); SQL> select * from t1;         ID ----------          1

4.删除数据文件

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[oracle@db2 ~]$ rm -f /opt/oracle/oradata/member/test01.dbf [oracle@db2 ~]$ sqlplus test/test SQL> create table t2 as select * from t1; create table t2 as select * from t1                                  * ERROR at line 1: ORA-01116: error in opening database file 5 ORA-01110: data file 5: '/opt/oracle/oradata/member/test01.dbf' ORA-27041: unable to open file Linux-x86_64 Error: 2: No such file or directory Additional information: 3 SQL> select table_name,tablespace_name from user_tables; TABLE_NAME                     TABLESPACE_NAME ------------------------------ ------------------------------ T1                             TEST

数据文件被删除了，这怎么办呢？这个时候千万别重启数据库，否则数据就丢失了

5.数据文件恢复

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[oracle@db2 ~]$ ps -ef |grep dbw0 oracle    3309     1  0 12:07 ?        00:00:00 ora_dbw0_member oracle    6217  5105  0 15:29 pts/0    00:00:00 grep dbw0 #找到ora_dbw0_SID的进程号3309 [oracle@db2 ~]$ cd /proc/3309/fd #以上3309就是进程号，然后执行ls -al查看文件的链接

可以看到文件27就是被删除的文件

1	[oracle@db2 fd]$ cp 27 /opt/oracle/oradata/member/test01.dbf

查看test表空间状态

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SQL> select name,status from v$datafile; NAME                      STATUS ----------------------------------------   ------- /opt/oracle/oradata/member/system01.dbf    SYSTEM /opt/oracle/oradata/member/sysaux01.dbf    ONLINE /opt/oracle/oradata/member/undotbs01.dbf    ONLINE /opt/oracle/oradata/member/users01.dbf    ONLINE /opt/oracle/oradata/member/test01.dbf    ONLINE

下线test01表文件

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SQL> alter database datafile '/opt/oracle/oradata/member/test01.dbf' offline; SQL> recover datafile '/opt/oracle/oradata/member/test01.dbf'; Media recovery complete. SQL> alter database datafile '/opt/oracle/oradata/member/test01.dbf' online; Database altered.

#以上就成功恢复了，若是出现

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SQL> recover datafile '/opt/oracle/oradata/member/test01.dbf'; ORA-00283: recovery session canceled due to errors ORA-01110: data file 5: '/opt/oracle/oradata/member/test01.dbf' ORA-01157: cannot identify/lock data file 5 - see DBWR trace file ORA-01110: data file 5: '/opt/oracle/oradata/member/test01.dbf'

则有可能是/opt/oracle/oradata/member/test01.dbf文件的权限问题引起，在root用户下

1 2	[iyunv@db2 ~]# chown -R oracle.oinstall /opt/oracle/oradata/member/test01.dbf 再recover datafile '/opt/oracle/oradata/member/test01.dbf'

实验完成后，删除测试用户及测试表空间

1 2	SQL> drop user test cascade; SQL> drop tablespace test INCLUDING CONTENTS AND DATAFILES;