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這篇“Oracle redo文件損壞怎么恢復”文章的知識點大部分人都不太理解，所以小編給大家總結了以下內容，內容詳細，步驟清晰，具有一定的借鑒價值，希望大家閱讀完這篇文章能有所收獲，下面我們一起來看看這篇“Oracle redo文件損壞怎么恢復”文章吧。
redo文件損壞涉及到多種多樣場景，具體場景可以分四大部分：
1、按照redo的狀態可以分為current、active和inactive；
2、按照數據庫歸檔模式可以分為歸檔和非歸檔；
3、按照臟塊有沒寫入數據文件可以分為有和無；
4、按照損壞時數據庫的狀態可以分為在線和關閉；
現在主要通過兩部分來介紹redo文件恢復相關的內容：
1、按照redo狀態維度來介紹各種場景的恢復方法；
2、模擬幾種恢復方法的操作；
一、按照redo狀態維度來介紹各種場景的恢復方法。
1.1、current redo文件恢復介紹：
1.2、active redo文件恢復介紹：
1.3、inactive redo文件恢復介紹：
二、模擬幾種恢復方法的操作；
下面主要選取 “current的redo文件在歸檔模式下采用不正常關閉數據庫時還有臟塊沒有寫入數據文件時的損壞” 和 “current的redo文件在非歸檔模式下數據庫在線時還有臟塊沒有寫入數據文件時的損壞” 這兩個場景來模擬和恢復，其他場景的恢復請參考上面的恢復操作。
2.1、current的redo文件在歸檔模式下采用不正常關閉數據庫時還有臟塊沒有寫入數據文件時的損壞模擬恢復：
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1、數據庫基本信息和redo情況 SQL> show parameter db_name NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_name string leonliao SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/oradata/leonliao/arch Oldest online log sequence 7 Next log sequence to archive 9 Current log sequence 9 SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 9 52428800 512 1 NO CURRENT 1250771 07-MAR-16 2.8147E+14 2 1 8 52428800 512 1 YES INACTIVE 1250768 07-MAR-16 1250771 07-MAR-16 3 1 7 52428800 512 1 YES INACTIVE 1250765 07-MAR-16 1250768 07-MAR-16 SQL> select * from v$logfile; GROUP# STATUS TYPE MEMBER IS_ ---------- ------- ------- --------------------------------------------- --- 3 ONLINE /home/oracle/oradata/leonliao/redo03.log NO 2 ONLINE /home/oracle/oradata/leonliao/redo02.log NO 1 ONLINE /home/oracle/oradata/leonliao/redo01.log NO 2、在t_redo表插入一條記錄2，并shutdown abort關閉數據庫 SQL> select * from t_redo; ID ---------- 1 SQL> insert into t_redo values(2); 1 row created. SQL> commit; Commit complete. SQL> shutdown abort ORACLE instance shut down. 3、刪掉current 的redo文件 [oracle@leon1 leonliao]$ pwd /home/oracle/oradata/leonliao [oracle@leon1 leonliao]$ rm -rf redo01.log 4、啟動數據庫到mount狀態并嘗試打開數據庫 SQL> startup mount ORACLE instance started. Total System Global Area 626327552 bytes Fixed Size 2230952 bytes Variable Size 184550744 bytes Database Buffers 432013312 bytes Redo Buffers 7532544 bytes Database mounted. SQL> alter database open; alter database open * ERROR at line 1: ORA-00313: open failed for members of log group 1 of thread 1 ORA-00312: online log 1 thread 1: '/home/oracle/oradata/leonliao/redo01.log' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 SQL> alter database clear logfile group 1; alter database clear logfile group 1 * ERROR at line 1: ORA-01624: log 1 needed for crash recovery of instance leonliao (thread 1) ORA-00312: online log 1 thread 1: '/home/oracle/oradata/leonliao/redo01.log' SQL> alter database clear unarchived logfile group 1; alter database clear unarchived logfile group 1 * ERROR at line 1: ORA-01624: log 1 needed for crash recovery of instance leonliao (thread 1) ORA-00312: online log 1 thread 1: '/home/oracle/oradata/leonliao/redo01.log' SQL> recover database until cancel; ORA-00279: change 1250771 generated at 03/07/2016 07:35:44 needed for thread 1 ORA-00289: suggestion : /home/oracle/oradata/leonliao/arch/1_9_905840705.dbf ORA-00280: change 1250771 for thread 1 is in sequence #9 Specify log: {<RET>=suggested | filename | AUTO | CANCEL} auto ORA-00308: cannot open archived log '/home/oracle/oradata/leonliao/arch/1_9_905840705.dbf' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 ORA-00308: cannot open archived log '/home/oracle/oradata/leonliao/arch/1_9_905840705.dbf' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below ORA-01194: file 1 needs more recovery to be consistent ORA-01110: data file 1: '/home/oracle/oradata/leonliao/system01.dbf' SQL> alter database open resetlogs; alter database open resetlogs * ERROR at line 1: ORA-01194: file 1 needs more recovery to be consistent ORA-01110: data file 1: '/home/oracle/oradata/leonliao/system01.dbf' 5、設置隱含參數_allow_resetlogs_corruption為true SQL> alter system set "_allow_resetlogs_corruption"=true scope=spfile; System altered. SQL> shutdown immediate ORA-01109: database not open Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 626327552 bytes Fixed Size 2230952 bytes Variable Size 184550744 bytes Database Buffers 432013312 bytes Redo Buffers 7532544 bytes Database mounted. SQL> alter database open resetlogs; Database altered. 6、驗證數據是否丟失，數據為2的記錄已經丟失 SQL> select * from t_redo; ID ---------- 1 |
2.2、current的redo文件在非歸檔模式下數據庫在線時還有臟塊沒有寫入數據文件時的損壞模擬恢復：
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1、數據庫基本信息和redo情況 SQL> show parameter db_name NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_name string leonliao SQL> archive log list; Database log mode No Archive Mode Automatic archival Disabled Archive destination /home/oracle/oradata/leonliao/arch Oldest online log sequence 2 Current log sequence 4 SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 4 52428800 512 1 NO CURRENT 1250086 07-MAR-16 2.8147E+14 2 1 2 52428800 512 1 NO INACTIVE 1250080 07-MAR-16 1250083 07-MAR-16 3 1 3 52428800 512 1 NO INACTIVE 1250083 07-MAR-16 1250086 07-MAR-16 SQL> select * from v$logfile; GROUP# STATUS TYPE MEMBER IS_ ---------- ------- ------- --------------------------------------------- --- 3 ONLINE /home/oracle/oradata/leonliao/redo03.log NO 2 ONLINE /home/oracle/oradata/leonliao/redo02.log NO 1 ONLINE /home/oracle/oradata/leonliao/redo01.log NO 2、創建t_redo表并插入一條數據 SQL> create table t_redo (id number); Table created. SQL> insert into t_redo values(1); 1 row created. SQL> commit; Commit complete. SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 4 52428800 512 1 NO CURRENT 1250086 07-MAR-16 2.8147E+14 2 1 2 52428800 512 1 NO INACTIVE 1250080 07-MAR-16 1250083 07-MAR-16 3 1 3 52428800 512 1 NO INACTIVE 1250083 07-MAR-16 1250086 07-MAR-16 3、刪除current的redo01.log文件 [oracle@leon1 leonliao]$ pwd /home/oracle/oradata/leonliao [oracle@leon1 leonliao]$ rm -rf redo01.log 4、嘗試直接通過不歸檔等方式初始化redo01.log文件，無法初始化current的redo文件 SQL> alter database clear unarchived logfile group 1; alter database clear unarchived logfile group 1 * ERROR at line 1: ORA-01624: log 1 needed for crash recovery of instance leonliao (thread 1) ORA-00312: online log 1 thread 1: '/home/oracle/oradata/leonliao/redo01.log' SQL> alter database clear logfile group 1; alter database clear logfile group 1 * ERROR at line 1: ORA-01624: log 1 needed for crash recovery of instance leonliao (thread 1) ORA-00312: online log 1 thread 1: '/home/oracle/oradata/leonliao/redo01.log' 5、通過將current狀態切換到active狀態，并初始化redo01.log文件 SQL> alter system switch logfile; System altered. SQL> alter database clear logfile group 1; Database altered. SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 0 52428800 512 1 NO UNUSED 1250086 07-MAR-16 1250147 07-MAR-16 2 1 5 52428800 512 1 NO CURRENT 1250147 07-MAR-16 2.8147E+14 3 1 3 52428800 512 1 NO INACTIVE 1250083 07-MAR-16 1250086 07-MAR-16 6、驗證數據是否丟失，數據沒有丟失 SQL> select * from t_redo; ID ---------- 1 |
以上就是關于“Oracle redo文件損壞怎么恢復”這篇文章的內容，相信大家都有了一定的了解，希望小編分享的內容對大家有幫助，若想了解更多相關的知識內容，請關注億速云行業資訊頻道。
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