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;
