【测试】数据文件的删除恢复

①创建测试表空间

SQL> create tablespace ts_test datafile '/u01/app/oracle/oradata/ORA11GR2/test.dbf'
  2  size 20m autoextend on;

Tablespace created.

②在测试表空间上创建测试表

SQL> create table t1 tablespace ts_test as select 1 id from dual;

Table created.

③删除数据文件

[oracle@host02 ~]$ rm /u01/app/oracle/oradata/ORA11GR2/test.dbf

④再创建表，验证，数据文件已丢失

create table t2 tablespace ts_test as select 1 id from dual;

切记，此时，不能关闭数据库

⑤查看DBWR进程的pid

[oracle@host02 ~]$ ps -ef|grep dbw|grep -v grep
oracle    2398     1  0 04:06 ?        00:00:00 ora_dbw0_ORA11GR2
oracle   18300     1  0 00:53 ?        00:00:00 ora_dbw0_PROD

⑥找到句柄

ls -rtl /proc/2398/fd

 lrwx------ 1 oracle oinstall 64 Oct 11 04:38 264 -> /u01/app/oracle/oradata/ORA11GR2/test.dbf (deleted)

⑦将找到的句柄拷贝回来

[oracle@host02 ~]$ cp /proc//2398/fd/264  /u01/app/oracle/oradata/ORA11GR2/test.dbf;

⑧查看数据文件的状态

SQL> select file#,status,name from v$datafile;

     FILE# STATUS
---------- -------
NAME
--------------------------------------------------------------------------------
         1 SYSTEM
/u01/app/oracle/oradata/ORA11GR2/system01.dbf

         2 ONLINE
/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

         3 ONLINE
/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf


     FILE# STATUS
---------- -------
NAME
--------------------------------------------------------------------------------
         4 ONLINE
/u01/app/oracle/oradata/ORA11GR2/users01.dbf

         5 ONLINE
/u01/app/oracle/oradata/ORA11GR2/example01.dbf

         6 ONLINE
/u01/app/oracle/oradata/ORA11GR2/test.dbf


6 rows selected.

⑨将数据文件offline

SQL> alter database datafile 6 offline;

Database altered.

再次查看数据文件

SQL> select file#,status,name from v$datafile;

     FILE# STATUS
---------- -------
NAME
--------------------------------------------------------------------------------
         1 SYSTEM
/u01/app/oracle/oradata/ORA11GR2/system01.dbf

         2 ONLINE
/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

         3 ONLINE
/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf


     FILE# STATUS
---------- -------
NAME
--------------------------------------------------------------------------------
         4 ONLINE
/u01/app/oracle/oradata/ORA11GR2/users01.dbf

         5 ONLINE
/u01/app/oracle/oradata/ORA11GR2/example01.dbf

         6 RECOVER
/u01/app/oracle/oradata/ORA11GR2/test.dbf


6 rows selected.

⑩恢复数据文件，将数据文件online

SQL> recover datafile 6;
Media recovery complete.
SQL> alter database datafile 6 online;

Database altered.