oracle-日志恢復-015

 沒有備份刪除表空間,需要日志恢復,但日志不能有斷點
在sys用戶下查看日志是否處於歸檔模式下
sql>archive log list
如果處於非歸檔模式需要sys用戶在數據庫的mount狀態下修改為歸檔模式
sql>alter database archive
 
 
1.創建用戶
SQL> create tablespace lits datafile 'e:\dbf\li01.dbf' size 50m;
 
Tablespace created.
 
SQL> create user li identified by li default tablespace lits;
 
User created.
 
SQL> grant connect to li;
 
Grant succeeded.
–允許用戶li任意使用lits表空間
SQL> alter user li quota unlimited on lits;
 
User altered.
 
SQL>
 
 
2.關庫,刪除dbf文件,模擬數據文件丟失或者損壞
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
–刪除li01.dbf
 
 
3.重啟
SQL> startup
ORACLE instance started.
 
Total System Global Area  171966464 bytes
Fixed Size                   787988 bytes
Variable Size             145488364 bytes
Database Buffers           25165824 bytes
Redo Buffers                 524288 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 11 – see DBWR trace file
ORA-01110: data file 11: 'E:\DBF\LI01.DBF'
–數據文件丟失隻能啟動到mount模式,如果要系統正常啟動,可以先把丟失的文件offline,其他正常的數據文件正常啟動數據庫
SQL> select file#,ts#,name from v$datafile;
 
     FILE#        TS# NAME
———- ———- ———————————————————-
         1          0 E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\SYSTEM01.DBF
         2          1 E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\UNDOTBS01.DBF
         3          2 E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\SYSAUX01.DBF
         4          4 E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\USERS01.DBF
         5          6 E:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\EXAMPLE01.DBF
         6          7 E:\DBF\MYTABLESPACE.DBF
         7          7 E:\DBF\MYTABLESPACE01.DBF
         8          7 E:\DBF\MY02
         9          8 E:\DBF\MYTS03
        10          9 E:\ORACLE\RMAN\RMANTS01.DBF
        11         10 E:\DBF\LI01.DBF
 
11 rows selected.
 
 
4.datafile offline啟動系統
 
SQL> alter database datafile 11 offline;
 
Database altered.
 
SQL> alter database open;
 
Database altered.
 
SQL>
SQL>
 
 
 
5.刪除原來損壞的新建dbf,li01.dbf必須是原來的同名
–還有另外一種恢復方式,在備份前提下 把備份拷貝到datafile同名的數據文件進行恢復
SQL> alter database create datafile 'e:\dbf\li01.dbf';
 
Database altered.
 
 
 
6.把日志同步到新的dbf
SQL> recover datafile 'e:\dbf\li01.dbf';
Media recovery complete.
 
–查不到表
SQL> select * from li.li01;
select * from li.li01
              *
ERROR at line 1:
ORA-00376: file 11 cannot be read at this time
ORA-01110: data file 11: 'E:\DBF\LI01.DBF'
SQL>
 
 
7.datafile online
SQL> alter database datafile 11 online;
 
Database altered.
 
SQL> select * from li.li01;
 
       LID
———-
         1
         2
         3
 
SQL>
–查詢結果是commit之前的結果。
SQL>

作者“fly@lwy”

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