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)
10年积累的成都做网站、网站制作经验，可以快速应对客户对网站的新想法和需求。提供各种问题对应的解决方案。让选择我们的客户得到更好、更有力的网络服务。我虽然不认识你，你也不认识我。但先网站设计后付款的网站建设流程，更有睢阳免费网站建设让你可以放心的选择与我们合作。
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
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
SQL> create user test identified by test default tablespace test; SQL> grant connect,resource to test;
3.插入测试数据
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
[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
[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
[oracle@db2 fd]$ cp 27 /opt/oracle/oradata/member/test01.dbf
查看test表空间状态
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
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
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
[root@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
SQL> drop user test cascade; SQL> drop tablespace test INCLUDING CONTENTS AND DATAFILES;
