oracle日志文件和控制文件損壞的恢復 恢復步驟： 1.加入_allow_resetlogs_corruption=true，_corrupted_rollback_segments=true，_offline_rollback_segments=true，啟動到nomount 2.利用控制文件的備份，進行腳本重建，由于current狀態redo損壞，所以要reset

oracle日志文件和控制文件損壞的恢復　　恢復步驟：

1.加入_allow_resetlogs_corruption=true，_corrupted_rollback_segments=true，_offline_rollback_segments=true，啟動到nomount

2.利用控制文件的備份，進行腳本重建，由于current狀態redo損壞，所以要resetlogs重建

3.重建后通過alter database open resetlogs;打開數據庫，這種情況會丟失在redo中相關事務的數據

備份控制文件并模擬故障：

SQL> set linesize 150

SQL> alter database backup controlfile to trace as '/home/oracle/ctl.ctl' reuse;

Database altered.

SQL> insert into tb1 values (1);

1 row created.

SQL> COMMIT;

Commit complete.

SQL> select * from v$log;

GROUP#??? THREAD#? SEQUENCE#????? BYTES??? MEMBERS ARC STATUS?????????? FIRST_CHANGE# FIRST_TIME

---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- -------------------

1????????? 1????????? 1? 536870912????????? 1 YES INACTIVE??????????? 1.2269E+11 2013-05-03 16:08:03

2????????? 1????????? 2? 536870912????????? 1 YES INACTIVE??????????? 1.2269E+11 2013-05-03 16:23:48

3????????? 1????????? 3? 536870912????????? 1 NO? CURRENT???????????? 1.2269E+11 2013-05-11 07:26:45

4????????? 1????????? 0? 536870912????????? 1 YES UNUSED?????????????????????? 0

5????????? 1????????? 0? 536870912????????? 1 YES UNUSED?????????????????????? 0

SQL> shutdown abort;

oracle@readerlogdb-> rm -f redo03.log

oracle@readerlogdb-> rm -f control01.ctl control02.ctl control03.ctl

通過加入相關參數啟動到nomount狀態：

SQL> conn /as sysdba

Connected to an idle instance.

SQL> startup;

ORACLE instance started.

Total System Global Area 5049942016 bytes

Fixed Size????????????????? 2090880 bytes

Variable Size??????????? 1375733888 bytes

Database Buffers???????? 3657433088 bytes

Redo Buffers?????????????? 14684160 bytes

ORA-00205: error in identifying control file, check alert log for more info

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

在備份的pfile中加入以下三行：

*._allow_resetlogs_corruption=true

*._corrupted_rollback_segments=true

*._offline_rollback_segments=true

NORESETLOGS和RESETLOGS在此實驗中的區別：

SQL>CREATE CONTROLFILE REUSE DATABASE "SKYREAD" NORESETLOGS FORCE LOGGING ARCHIVELOG

MAXLOGFILES 20

MAXLOGMEMBERS 5

MAXDATAFILES 1000

MAXINSTANCES 8

MAXLOGHISTORY 2337

LOGFILE

GROUP 1 '/database/oradata/skyread/redo01.log'? SIZE 512M,

GROUP 2 '/database/oradata/skyread/redo02.log'? SIZE 512M,

GROUP 3 '/database/oradata/skyread/redo03.log'? SIZE 512M,

GROUP 4 '/database/oradata/skyread/redo04.log'? SIZE 512M,

GROUP 5 '/database/oradata/skyread/redo05.log'? SIZE 512M

DATAFILE

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