没有备份的current状态的redo日志损坏

SQL> select* from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM



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

1 1 2 52428800 1 YES ACTIVE 464602 07-SEP-12

2 1 3 52428800 1 NO CURRENT 464604 07-SEP-12

3 1 1 52428800 1 YES ACTIVE 464091 07-SEP-12

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_

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

3 ONLINE /u01/tiger/oradata/orcl/redo03.log NO

2 ONLINE /u01/tiger/oradata/orcl/redo02.log NO

1 ONLINE /u01/tiger/oradata/orcl/redo01.log NO

SQL> !cp /etc/passwd/u01/tiger/oradata/orcl/redo02.log

SQL> alter system switch logfile;

alter system switch logfile

*

ERROR at line 1:

ORA-03113: end-of-file on communicationchannel

SQL> conn /as sysdba

Connected to an idle instance.

SQL> startup

Oracle instance started.

Total System Global Area 314572800 bytes

Fixed Size 1219136 bytes

Variable Size 117441984 bytes

Database Buffers 188743680 bytes

Redo Buffers 7168000 bytes

Database mounted.

ORA-00316:log 2 of thread 1, type 14900 in header is not log file

ORA-00312: online log 2 thread 1:'/u01/tiger/oradata/orcl/redo02.log'

SQL> recover database;

ORA-00283: recovery session canceled due toerrors

ORA-00316: log 2 of thread 1, type 14900 inheader is not log file

ORA-00312: online log 2 thread 1:'/u01/tiger/oradata/orcl/redo02.log'

SQL> recover database until cancel;

ORA-00279: change 464604 generated at09/07/2012 15:26:50 needed for thread 1

ORA-00289: suggestion :/u01/tiger/flash_recovery_area/ORCL/archivelog/2012_09_07/o1_mf_1_3_%u_.arc

ORA-00280: change 464604 for thread 1 is insequence #3

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:'/u01/tiger/oradata/orcl/system01.dbf'

ORA-01112: media recovery not started

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01589: must use RESETLOGS orNORESETLOGS option for database open

SQL> alter database open resetlogs;

Database altered.

无备份的使用隐含参数恢复

如果出现如下情况

SQL> alter database open resetlogs;

alter database open resetlogs

*

ERROR at line 1:

ORA-01194: file 1 needs more recovery to beconsistent

ORA-01110: data file 1:'/u01/oracle/oradata/ora10g/system01.dbf'

我们只能放弃不完全恢复使用隐含参数恢复

altersystem set "_allow_resetlogs_corruption"=true scope=spfile;