归档模式下active日志损坏
active代表日志切换过可能已经归档；也可能代表日志中的脏块还没有被DBWR写盘
查看归档路径
SQL> show parameter recovery
NAME TYPE VALUE
----------------------------------------------- ------------------------------
db_recovery_file_dest string /u01/tiger/flash_recovery_area
db_recovery_file_dest_size big integer 2G
recovery_parallelism integer 0
如果是刚创建的数据库那么就会出现unused状态
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- -------------------- --- ---------------- ------------- ---------
1 1 2 52428800 1 NO CURRENT 452423 07-SEP-12
2 1 0 52428800 1 YES UNUSED 0
3 1 1 52428800 1 YES INACTIVE 446075 07-SEP-12
第一，查看日志的状态和对应的日志文件
SQL> select * from v$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> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- -------------------- --- ---------------- ------------- ---------
1 1 2 52428800 1 YES ACTIVE 460765 07-SEP-12
2 1 3 52428800 1 NO CURRENT 460767 07-SEP-12
3 1 1 52428800 1 YES ACTIVE 459268 07-SEP-12
第二破坏日志做测试
SQL> !cp /etc/passwd/u01/tiger/oradata/orcl/redo01.log
SQL> conn /as sysdba
Connected.
SQL> shut abort
Oracle instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1219136 bytes
Variable Size 104859072 bytes
Database Buffers 201326592 bytes
Redo Buffers 7168000 bytes
Database mounted.
ORA-00313: open failed for members of loggroup 1 of thread 1
ORA-00312: online log 1 thread 1:'/u01/tiger/oradata/orcl/redo01.log'
ORA-27046: file size is not a multiple oflogical block size
Additional information: 1
第三恢复日志
SQL> alter database clear logfile group 1;
alter database clear logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of instance orcl(thread 1)
ORA-00312: online log 1 thread 1:'/u01/tiger/oradata/orcl/redo01.log'
------当我们清洗日志组的时候发现因为视力恢复的时候需要日志组1所以清洗不了
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- -------------------- --- ---------------- ------------- ---------
1 1 2 52428800 1 YES ACTIVE 460765 07-SEP-12
3 1 1 52428800 1 YES ACTIVE 459268 07-SEP-12
2 1 3 52428800 1 NO CURRENT 460767 07-SEP-12
------检查日志组的状态发现是在active的时候损坏的
SQL> recover database;
ORA-00283: recovery session canceled due toerrors
ORA-00313: open failed for members of log group 1 ofthread 1
ORA-00312: online log 1 thread 1:'/u01/tiger/oradata/orcl/redo01.log'
ORA-27046: file size is not a multiple oflogical block size
Additional information: 1
------当恢复读取日志组1的redo01.dbf的时候格式不对打开失败
因为有归档但是数据不认为此次恢复需要归档，我们手工提供归档
SQL> recover database until cancel;
ORA-00279: change 460765 generated at09/07/2012 13:32:38 needed for thread 1
ORA-00289: suggestion :/u01/tiger/flash_recovery_area/ORCL/archivelog/2012_09_07/o1_mf_1_2_%u_.arc
ORA-00280: change 460765 for thread 1 is insequence #2
Specify log: {=suggested |filename | AUTO | CANCEL}
ORA-00279: change 460767 generated at09/07/2012 13:32:40 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 460767 for thread 1 is insequence #3
ORA-00278: log file'/u01/tiger/flash_recovery_area/ORCL/archivelog/2012_09_07/o1_mf_1_2_84m1qrxr_.arc'no longer neededfor this recovery
------2号文件我们没有用到因为刚才recover databas恢复的时候应用了2号日志文件对应的是第三组下一个是3号日志文件实际上就是current日志还没有来得及切换就已经崩溃了所以没有归档我们提供在线的current日志，我们的在线日志是第二组里的日志文件
Specify log: {=suggested |filename | AUTO | CANCEL}
/u01/tiger/oradata/orcl/redo02.log
Log applied.
Media recovery complete.
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.