Oracle 12cR1 rac怎么恢復到單機文件系統測試

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對從12cR1 RAC到單機文件系統的還原做個簡單的示例。
1、參數文件的修改

1. SQL> create pfile='/home/oracle/init.ora' from spfile;

通過上述命令轉儲pfile出來進行參數的修改。

2、將備份出的控制文件在單機上進行還原

1. RMAN> restore controlfile from '/recovert_area/tmp/controlfile_db_p5sb7rbl_1_1.bak;

3、還原數據庫
將備份集放入recovery_area/bak/目錄下，執行以下命令：

1. RMAN> catalog start with '/recovery_area/bak/';

這里的數據文件文件和臨時文件的路徑需要更改下，因為是還原到文件系統，這里給出示例腳本沒有給出最終的數據文件名稱，所以只供參考：

1. select 'set newname for tempfile '||file#|| ' to ''/ora12c/oradata/cdb/'';' from v$tempfile where con_id=1;
   

2. select 'set newname for tempfile '||file#|| ' to ''/ora12c/oradata/seed/'';' from v$tempfile where con_id=2;
   

3. select 'set newname for tempfile '||file#|| ' to ''/ora12c/oradata/pdb/pdb1/'';' from v$tempfile where con_id=3;
   

4. select 'set newname for datafile '||file#|| ' to ''/ora12c/oradata/cdb/'';' from v$datafile where con_id=1;
   

5. select 'set newname for datafile '||file#|| ' to ''/ora12c/oradata/seed/'';' from v$datafile where con_id=2;
   

6. select 'set newname for datafile '||file#|| ' to ''/ora12c/oradata/pdb/pdb1/'';' from v$datafile where con_id=3;

下面給出還原的腳本，供參考

1. run
   

2. {
   

3. set newname for datafile 1 to '/ora12c/oradata/cdb/system01.dbf';
   

4. set newname for datafile 3 to '/ora12c/oradata/cdb/sysaux01.dbf';
   

5. set newname for datafile 4 to '/ora12c/oradata/cdb/undotbs01.dbf';
   

6. set newname for datafile 6 to '/ora12c/oradata/cdb/users01.dbf';
   

7. set newname for datafile 8 to '/ora12c/oradata/cdb/undotbs02.dbf';
   

8. set newname for datafile 9 to '/ora12c/oradata/cdb/undotbs03.dbf';
   

9. set newname for datafile 5 to '/ora12c/oradata/seed/system01.dbf';
   

10. set newname for datafile 7 to '/ora12c/oradata/seed/sysaux01.dbf';
    

11. set newname for datafile 10 to '/ora12c/oradata/pdb/pdb1/clsprm_system.dbf';
    

12. set newname for datafile 11 to '/ora12c/oradata/pdb/pdb1/clsprm_sysaux.dbf';
    

13. set newname for datafile 12 to '/ora12c/oradata/pdb/pdb1/clsprm_users01.dbf';
    

14. set newname for datafile 14 to '/ora12c/oradata/pdb/pdb1/test2_01.dbf';
    

15. set newname for datafile 16 to '/ora12c/oradata/pdb/pdb1/test021.dbf';
    

16. set newname for tempfile 1 to '/ora12c/oradata/cdb/temp01.dbf';
    

17. set newname for tempfile 2 to '/ora12c/oradata/seed/temp01.dbf';
    

18. set newname for tempfile 3 to '/ora12c/oradata/pdb/pdb1/temp01.dbf';
    

19. restore database;
    

20. switch datafile all;
    

21. switch tempfile all;
    

22. }

4、恢復數據庫
這里做不完全恢復。

RMAN> list backup of database;
省略部分。。。。。
 File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  1       Full 40189418   06-AUG-17 /ora12c/oradata/cdb/system01.dbf
  3       Full 40189418   06-AUG-17 /ora12c/oradata/cdb/sysaux01.dbf
  4       Full 40189418   06-AUG-17 /ora12c/oradata/cdb/undotbs01.dbf
  6       Full 40189418   06-AUG-17 /ora12c/oradata/cdb/users01.dbf
省略部分。。。。。
==》通過上述部分可以看到Ckp SCN 為40189418、

RMAN>  list backup of archivelog all;
省略部分。。。
  Thrd Seq     Low SCN    Low Time  Next SCN   Next Time
  ---- ------- ---------- --------- ---------- ---------
  1    664     40186320   06-AUG-17 40188631   06-AUG-17
  1    665     40188631   06-AUG-17 40190128   06-AUG-17
  2    634     40186323   06-AUG-17 40188634   06-AUG-17
  2    635     40188634   06-AUG-17 40190122   06-AUG-17
  3    582     40186334   06-AUG-17 40188628   06-AUG-17
  3    583     40188628   06-AUG-17 40190125   06-AUG-17
省略部分。。。
==》通過對歸檔的Low SCN和Next SCN以及Ckp SCN 的分析，確認恢復到scn號為40190122。

以下給出恢復的腳本，供參考

1. run {
   

2. set archivelog destination to '/recovery_area/tmp/';
   

3. recover database until scn 40190122;
   

4. }

5、打開數據庫

1. RMAN> alter database open resetlogs;

如果打不開，要求介質恢復，可以繼續追加歸檔日志進行恢復。

6、刪除多余的日志組和undo表空間
（1）清理日志組

1. SELECT b.member, a.group#,thread#, a.status
   

2. FROM v$log a, v$logfile b
   

3. WHERE a.group# = b.group#
   

4. ORDER BY a.thread#,b.group#;
   

5. 
   

6. MEMBER GROUP# THREAD# STATUS
   

7. ------------------------------ ---------- ---------- -------------
   

8. +CDB/cdb/redo01.log 1          1 CURRENT
   

9. +CDB/cdb/redo02.log 2          1 UNUSED
   

10. +CDB/cdb/redo03.log 3          2 INACTIVE
    

11. +CDB/cdb/redo04.log 4          2 UNUSED
    

12. +CDB/cdb/redo05.log 5          3 INACTIVE
    

13. +CDB/cdb/redo06.log 6          3 UNUSED 

==》這里刪除組3，4，5，6

1. SQL> alter database disable thread 2;
   

2. Database altered.
   

3. SQL> alter database disable thread 3;
   

4. Database altered.
   

5. SQL> alter database drop logfile group 3;
   

6. Database altered.
   

7. SQL> alter database drop logfile group 4;
   

8. Database altered.
   

9. SQL> alter database drop logfile group 5;
   

10. Database altered.
    

11. SQL> alter database drop logfile group 6;
    

12. Database altered.

（2）清理unod表空間

1. SQL> select name from v$tablespace where name like 'UNDO%';
   

2. NAME
   

3. -------------------------
   

4. UNDOTBS1
   

5. UNDOTBS2
   

6. UNDOTBS3

==》通過show parameter undo_tablespace 命令確認要保留的undo,這里刪除UNDOTBS2和UNDOTBS3表空間

1. SQL> drop tablespace UNDOTBS2 including contents and datafiles;
   

2. Tablespace dropped.
   

3. SQL> drop tablespace UNDOTBS3 including contents and datafiles;
   

4. Tablespace dropped.

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