前提：歸檔模式下開啟熱備份模式 1.備份資料庫
在PL/SQL下執行以下SQL產生啟動表空間的熱備模式：

select 'alter tablespace ' || tablespace_name || ' begin backup;' from dba_tablespaces where logging = 'LOGGING';

[oracle@oracledb ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.4.0 Production on Fri Jan 20 07:35:51 2017Copyright (c) 1982, 2013, Oracle.  All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> alter tablespace SYSTEM begin backup; alter tablespace SYSAUX begin backup; alter tablespace UNDOTBS1 begin backup; alter tablespace USERS begin backup; alter tablespace BARD begin backup; alter tablespace BARX begin backup; Tablespace altered.SQL> Tablespace altered.SQL> Tablespace altered.SQL> Tablespace altered.SQL> Tablespace altered. 啟動熱備模式後複製相關檔案進行儲存
su - oracle
cp -R /u01/oracle/oradata/orcl/* /u01/oracle/orabak/hotbak/2017-01-19/ 完成檔案複製後進行end backup操作
su - oracle
sqlplus / as sysdba
alter tablespace SYSTEM end backup;
alter tablespace SYSAUX end backup;
alter tablespace UNDOTBS1 end backup;
alter tablespace USERS end backup;
alter tablespace BARD end backup;
alter tablespace BARX end backup;
2.刪除部分資料檔案
su - oracle
sqlplus / as sysdba 刪除一個數據檔案
!rm /u01/oracle/oradata/orcl/bard01.dbf
嘗試查詢這個表空間上的表，結果能訪問數
select count(*) from nvl_user.tmp1;

SQL> !rm /u01/oracle/oradata/orcl/bard01.dbf;

SQL> select count(*) from nvl_user.tmp1;

  COUNT(*)
----------
    300100

做一個全域性檢查點
alter system checkpoint;

SQL> alter system checkpoint;

System altered.

再次嘗試訪問表，發現已經無法訪問
select count(*) from nvl_user.tmp1;

SQL> select count(*) from nvl_user.tmp1;
select count(*) from nvl_user.tmp1
                              *
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/u01/oracle/oradata/orcl/bard01.dbf'
 

3.使用備份還原資料庫
嘗試offline表空間，但因檔案丟失，會失敗
alter tablespace bard offline; 需進入offline immediate狀態：
alter tablespace bard offline immediate;

SQL> alter tablespace bard offline immediate;

Tablespace altered.

從熱備中找到對應檔案還原
!cp /u01/oracle/orabak/hotbak/2017-01-19/bard01.dbf  /u01/oracle/oradata/orcl/ 進行表空間的恢復

SQL> recover tablespace bard;
Media recovery complete.
 

嘗試訪問表，發現還是不能訪問

SQL> select count(*) from nvl_user.tmp1;
select count(*) from nvl_user.tmp1
                              *
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/u01/oracle/oradata/orcl/bard01.dbf'

將表空間進行online操作
alter tablespace bard online; 再次訪問表，可以訪問了

SQL> alter tablespace bard online;

Tablespace altered.

SQL> select count(*) from nvl_user.tmp1;

  COUNT(*)
----------
    300100