Oracle 聯機重做記錄檔恢複（redo log）

非當前聯機記錄檔故障恢複

1.啟動資料庫時遇到ORA-00313，ORA-00312錯誤。

ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/home/Oracle/oradata/s1/redo01.log'

2.查看v$log視圖。

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 11 52428800 1 YES INACTIVE 489912 09-NOV-12
3 1 10 52428800 1 YES INACTIVE 488868 08-NOV-12
2 1 12 52428800 1 NO CURRENT 519028 11-NOV-12

3.用clear命令重建該記錄檔

如果該記錄檔已經歸檔則：
SQL> alter database clear logfile group 1;

Database altered.

如果該記錄檔還沒有歸檔則：
SQL> alter database clear unarchived logfile group 3;

Database altered.

4.開啟資料庫，重新備份資料庫（建議clear，特別是clear unarchived後做一次全備份）
SQL> alter database open;

Database altered.

當前聯機記錄檔故障恢複

歸檔模式下，當前記錄檔損壞有兩種情況

一、資料庫正常關閉，記錄檔中沒有解決的事務要執行個體恢複，當前日誌組的損壞可直接使用者
alter database clear unarchived logfile group n來重建

二、記錄檔中有活動事物，資料庫需要介質恢複，有兩種補救方法
a、在歸檔模式下，有可用備份
b、無可用備份，通過強制性恢複，但可能會導致資料庫不一致

a.在歸檔模式下有可用備份（不完全恢複）
1.1.啟動資料庫時報錯，並用v$log查看
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/home/oracle/oradata/s1/redo01.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 16 52428800 1 NO CURRENT 520744 11-NOV-12
2 1 15 52428800 1 YES ACTIVE 520712 11-NOV-12
3 1 14 52428800 1 YES INACTIVE 520705 11-NOV-12

2.試用clear恢複

SQL> alter database clear logfile group 1;

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 s1 (thread 1)
ORA-00312: online log 1 thread 1: '/home/oracle/oradata/s1/redo01.log'

3.執行recover database until cancel先使用者auto後用cancel，報錯如下：
SQL> recover database until cancel;
ORA-00279: change 520744 generated at 11/11/2012 22:43:39 needed for thread 1
ORA-00289: suggestion : /archive1/1_16_798842981.dbf
ORA-00280: change 520744 for thread 1 is in sequence #16
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log '/archive1/1_16_798842981.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log '/archive1/1_16_798842981.dbf'
ORA-27037: unable to obtain file status
Linux 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/s1/system01.dbf'

SQL> recover database until cancel;
ORA-00279: change 520744 generated at 11/11/2012 22:43:39 needed for thread 1
ORA-00289: suggestion : /archive1/1_16_798842981.dbf
ORA-00280: change 520744 for thread 1 is in sequence #16
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
cancel
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/s1/system01.dbf'
ORA-01112: media recovery not started

4.在rman下restore database；
RMAN> restore database;

5.在rman下recover database：報錯如下：
RMAN> recover database;

Starting recover at 11-NOV-12
using channel ORA_DISK_1

starting media recovery
media recovery failed
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 11/11/2012 22:54:15
ORA-00283: recovery session canceled due to errors
RMAN-11003: failure during parse/execution of SQL statement: alter database recover if needed
start
ORA-00283: recovery session canceled due to errors
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/home/oracle/oradata/s1/redo01.log'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3

6.使用recover database until cancel;先auto後cancel恢複
SQL> recover database until cancel;
ORA-00279: change 520744 generated at 11/11/2012 22:43:39 needed for thread 1
ORA-00289: suggestion : /archive1/1_16_798842981.dbf
ORA-00280: change 520744 for thread 1 is in sequence #16
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
ORA-00308: cannot open archived log '/archive1/1_16_798842981.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log '/archive1/1_16_798842981.dbf'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3

SQL> recover database until cancel;
ORA-00279: change 520744 generated at 11/11/2012 22:43:39 needed for thread 1
ORA-00289: suggestion : /archive1/1_16_798842981.dbf
ORA-00280: change 520744 for thread 1 is in sequence #16
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
cancel
Media recovery cancelled.

7，使用resetlogs開啟資料庫
SQL> alter database open resetlogs;

Database altered.

8.做資料庫全備份

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