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基于日志挖掘的误操作不完全恢复思路

分类：大数据作者：编程之家

生成备份所有数据文件的脚本:
select 'alter tablespace '||tablespace_name||' begin backup;'||chr(10)||
'ho cp -v '||file_name||' /home/oracle/hotbk/'||chr(10)||
'alter tablespace '||tablespace_name||' end backup;'
from dba_data_files;
备份controlfile:
alter database backup controlfile to '/home/oracle/hotbk/ctl_after_reset.bk';
alter database backup controlfile to trace as '/home/oracle/hotbk/cre_ctl.sql';
备份成功后切换一次归档日志:
alter system switch logfile;

online redolog 很重要！！！

sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325

alter tablespace USERS begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/users01.dbf  /home/oracle/hotbk/
alter tablespace USERS end backup;
alter tablespace UNDOTBS1 begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/undotbs01.dbf  /home/oracle/hotbk/
alter tablespace UNDOTBS1 end backup;
alter tablespace SYSAUX begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/sysaux01.dbf  /home/oracle/hotbk/
alter tablespace SYSAUX end backup;
alter tablespace SYstem begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/system01.dbf  /home/oracle/hotbk/
alter tablespace SYstem end backup;
alter tablespace JF_DATA begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/jf_data01.dbf  /home/oracle/hotbk/
alter tablespace JF_DATA end backup;
alter tablespace JF_DATA begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/jf_data02.dbf  /home/oracle/hotbk/
alter tablespace JF_DATA end backup;
alter tablespace T2 begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/t2a.dbf  /home/oracle/hotbk/
alter tablespace T2 end backup;

sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325
sql> SELECT COUNT(*) FROM DAODAO;
  COUNT(*)
----------
    500002
sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325
sql> SELECT COUNT(*) FROM DAODAO;
  COUNT(*)
----------
    500002
sql> DELETE FROM DAODAO;
500002 rows deleted.
sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325

sql> conn / as sysdba
Connected.
sql> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /home/oracle/archivelog
Oldest online log sequence     7
Next log sequence to archive   10
Current log sequence           10
sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1089560
sql> drop table daodao purge;
Table dropped.
sql> purge recyclebin;
Recyclebin purged.

挖掘dml语句需要将数据库置为追加日志数据模式:
默认只是记录ddl语句
alter database add SUPPLEMENTAL LOG data;

sql> select group#,status from v$log where status='CURRENT';
    GROUP# STATUS
---------- ----------------
         2 CURRENT
sql> SELECT MEMBER FROM  V$LOGFILE WHERE GROUP#=2;
MEMBER
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/mdnss/redo02.log
挖掘dml语句需要将数据库置为追加日志数据模式:
默认只是记录ddl语句
alter database add SUPPLEMENTAL LOG data;
sql> exec dbms_logmnr.add_logfile('/u01/app/oracle/oradata/mdnss/redo02.log',dbms_logmnr.new);
PL/sql procedure successfully completed.
sql>  exec dbms_logmnr.add_logfile('/u01/app/oracle/oradata/mdnss/redo01.log',dbms_logmnr.addfile);
PL/sql procedure successfully completed.
sql> exec dbms_logmnr.add_logfile('/u01/app/oracle/oradata/mdnss/redo03.log',dbms_logmnr.addfile);
PL/sql procedure successfully completed.
sql> exec dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog);
PL/sql procedure successfully completed.
select scn,sql_redo from v$logmnr_contents where lower(sql_redo) like '%drop%' and seg_name='DAODAO'  and seg_owner='SCott'

sql> select scn,sql_redo from v$logmnr_contents where lower(sql_redo) like '%drop%' and seg_name='DAODAO'  and seg_owner='SCott';
       SCN
----------
sql_REDO
--------------------------------------------------------------------------------
   1089685
drop table daodao purge;
说明这个SCN号上面删除了这个对应的表所以得进行还原
sql> select * from v$log;
sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325

alter tablespace USERS begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/users01.dbf  /home/oracle/hotbk/
alter tablespace USERS end backup;
alter tablespace UNDOTBS1 begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/undotbs01.dbf  /home/oracle/hotbk/
alter tablespace UNDOTBS1 end backup;
alter tablespace SYSAUX begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/sysaux01.dbf  /home/oracle/hotbk/
alter tablespace SYSAUX end backup;
alter tablespace SYstem begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/system01.dbf  /home/oracle/hotbk/
alter tablespace SYstem end backup;
alter tablespace JF_DATA begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/jf_data01.dbf  /home/oracle/hotbk/
alter tablespace JF_DATA end backup;
alter tablespace JF_DATA begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/jf_data02.dbf  /home/oracle/hotbk/
alter tablespace JF_DATA end backup;
alter tablespace T2 begin backup;
ho cp -v /u01/app/oracle/oradata/mdnss/t2a.dbf  /home/oracle/hotbk/
alter tablespace T2 end backup;
alter database backup controlfile to '/home/oracle/hotbk/ctl_after_reset.bk';
alter database backup controlfile to trace as '/home/oracle/hotbk/cre_ctl.sql';
sql> select  CHECKPOINT_CHANGE#  from v$database;
CHECKPOINT_CHANGE#
------------------
           1079325
sql> SELECT COUNT(*) FROM DAODAO;
  COUNT(*)
----------
    500002
sql> select * from v$log;
    GROUP#    THREAD#  SEQUENCE#      BYTES  BLOCKSIZE    MEMBERS ARC
---------- ---------- ---------- ---------- ---------- ---------- ---
STATUS           FirsT_CHANGE# FirsT_TIM NEXT_CHANGE# NEXT_TIME
---------------- ------------- --------- ------------ ---------
         1          1          9   52428800        512          1 YES
INACTIVE               1089570 31-JUL-13      1089575 31-JUL-13
         2          1         10   52428800        512          1 NO
CURRENT                1089575 31-JUL-13   2.8147E+14
         3          1          7   52428800        512          1 YES
INACTIVE               1089560 31-JUL-13      1089565 31-JUL-13
         4          1          8   52428800        512          1 YES
INACTIVE               1089565 31-JUL-13      1089570 31-JUL-13

select * from v$logfile
    GROUP# STATUS  TYPE
---------- ------- -------
MEMBER
--------------------------------------------------------------------------------
IS_
---
         3         ONLINE
/u01/app/oracle/oradata/mdnss/redo03.log
NO
         2         ONLINE
/u01/app/oracle/oradata/mdnss/redo02.log
NO
         1         ONLINE
/u01/app/oracle/oradata/mdnss/redo01.log
NO
         4         ONLINE
/u01/app/oracle/oradata/mdnss/redo09.log
NO
sql> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
[oracle@node1 hotbk]$ cp -v  ./*.dbf /u01/app/oracle/oradata/mdnss/
`./jf_data01.dbf' -> `/u01/app/oracle/oradata/mdnss/jf_data01.dbf'
`./jf_data02.dbf' -> `/u01/app/oracle/oradata/mdnss/jf_data02.dbf'
`./sysaux01.dbf' -> `/u01/app/oracle/oradata/mdnss/sysaux01.dbf'
`./system01.dbf' -> `/u01/app/oracle/oradata/mdnss/system01.dbf'
`./t2a.dbf' -> `/u01/app/oracle/oradata/mdnss/t2a.dbf'
`./undotbs01.dbf' -> `/u01/app/oracle/oradata/mdnss/undotbs01.dbf'
`./users01.dbf' -> `/u01/app/oracle/oradata/mdnss/users01.dbf'

[oracle@node1 ~]$ ls /home/oracle/hotbk
jf_data01.dbf  jf_data02.dbf  sysaux01.dbf  system01.dbf  t2a.dbf  undotbs01.dbf  users01.dbf
[oracle@node1 ~]$ ls /u01/app/oracle/oradata/mdnss
control01.ctl  jf_data02.dbf  redo02.log  redo09.log   redo10.log    system01.dbf  temp01.dbf     users01.dbf
jf_data01.dbf  redo01.log     redo03.log  redo10b.log  sysaux01.dbf  t2a.dbf       undotbs01.dbf
[oracle@node1 ~]$ cp -v /home/oracle/hotbk/ctl_after_reset.bk /u01/app/oracle/oradata/mdnss/control01.ctl
`/home/oracle/hotbk/ctl_after_reset.bk' -> `/u01/app/oracle/oradata/mdnss/control01.ctl'
[oracle@node1 ~]$ cp -v /home/oracle/hotbk/ctl_after_reset.bk /u01/app/oracle/flash_recovery_area/mdnss/control02.ctl
`/home/oracle/hotbk/ctl_after_reset.bk' -> `/u01/app/oracle/flash_recovery_area/mdnss/control02.ctl'
startup mount

sql> recover database using backup controlfile until change 1089684; 
ORA-00279: change 1086571 generated at 07/31/2013 16:01:31 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_3_822209838.dbf
ORA-00280: change 1086571 for thread 1 is in sequence #3
sql> select * from v$recover_file; 
     FILE# ONLINE  ONLINE_
---------- ------- -------
ERROR                                                                CHANGE#
----------------------------------------------------------------- ----------
TIME
---------
         1 ONLINE  ONLINE
                                                                     1086670
31-JUL-13
         2 ONLINE  ONLINE
                                                                     1086631
31-JUL-13
     FILE# ONLINE  ONLINE_
---------- ------- -------
ERROR                                                                CHANGE#
----------------------------------------------------------------- ----------
TIME
---------
         3 ONLINE  ONLINE
                                                                     1086599
31-JUL-13
         4 ONLINE  ONLINE
                                                                     1086571
     FILE# ONLINE  ONLINE_
---------- ------- -------
ERROR                                                                CHANGE#
----------------------------------------------------------------- ----------
TIME
---------
31-JUL-13
         5 ONLINE  ONLINE
                                                                     1086706
31-JUL-13
         6 ONLINE  ONLINE
     FILE# ONLINE  ONLINE_
---------- ------- -------
ERROR                                                                CHANGE#
----------------------------------------------------------------- ----------
TIME
---------
                                                                     1086725
31-JUL-13
         7 ONLINE  ONLINE
                                                                     1086744
31-JUL-13

7 rows selected.
注意这个SCN是通过日志查出的SCN -1的状态1089684=1089685-1的SCN状态处去
sql> recover database using backup controlfile until change 1089684; 
ORA-00279: change 1086571 generated at 07/31/2013 16:01:31 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_3_822209838.dbf
ORA-00280: change 1086571 for thread 1 is in sequence #3

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/home/oracle/archivelog/1_3_822209838.dbf
ORA-00279: change 1087756 generated at 07/31/2013 16:10:54 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_4_822209838.dbf
ORA-00280: change 1087756 for thread 1 is in sequence #4
ORA-00278: log file '/home/oracle/archivelog/1_3_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
 /home/oracle/archivelog/1_4_822209838.dbf
ORA-00279: change 1088643 generated at 07/31/2013 16:11:10 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_5_822209838.dbf
ORA-00280: change 1088643 for thread 1 is in sequence #5
ORA-00278: log file '/home/oracle/archivelog/1_4_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/home/oracle/archivelog/1_5_822209838.dbf
ORA-00279: change 1089508 generated at 07/31/2013 16:11:27 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_6_822209838.dbf
ORA-00280: change 1089508 for thread 1 is in sequence #6
ORA-00278: log file '/home/oracle/archivelog/1_5_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
 /home/oracle/archivelog/1_6_822209838.dbf
ORA-00279: change 1089560 generated at 07/31/2013 16:13:29 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_7_822209838.dbf
ORA-00280: change 1089560 for thread 1 is in sequence #7
ORA-00278: log file '/home/oracle/archivelog/1_6_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
 /home/oracle/archivelog/1_7_822209838.dbf
ORA-00279: change 1089565 generated at 07/31/2013 16:13:33 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_8_822209838.dbf
ORA-00280: change 1089565 for thread 1 is in sequence #8
ORA-00278: log file '/home/oracle/archivelog/1_7_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
 /home/oracle/archivelog/1_8_822209838.dbf
ORA-00279: change 1089570 generated at 07/31/2013 16:13:37 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_9_822209838.dbf
ORA-00280: change 1089570 for thread 1 is in sequence #9
ORA-00278: log file '/home/oracle/archivelog/1_8_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/home/oracle/archivelog/1_9_822209838.dbf
ORA-00279: change 1089575 generated at 07/31/2013 16:13:40 needed for thread 1
ORA-00289: suggestion : /home/oracle/archivelog/1_10_822209838.dbf
ORA-00280: change 1089575 for thread 1 is in sequence #10
ORA-00278: log file '/home/oracle/archivelog/1_9_822209838.dbf' no longer
needed for this recovery

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/home/oracle/archivelog/1_10_822209838.dbf
ORA-00308: cannot open archived log
'/home/oracle/archivelog/1_10_822209838.dbf'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional @R_825_4045@ion: 3

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
 
 

从上面查询的CURRENT日志是group#=2号文件 其他组的状态组都是inactive状态
sql> select * from v$log;
    GROUP#    THREAD#  SEQUENCE#      BYTES  BLOCKSIZE    MEMBERS ARC
---------- ---------- ---------- ---------- ---------- ---------- ---
STATUS           FirsT_CHANGE# FirsT_TIM NEXT_CHANGE# NEXT_TIME
---------------- ------------- --------- ------------ ---------
         1          1          9   52428800        512          1 YES
INACTIVE               1089570 31-JUL-13      1089575 31-JUL-13
         2          1         10   52428800        512          1 NO
CURRENT                1089575 31-JUL-13   2.8147E+14
         3          1          7   52428800        512          1 YES
INACTIVE               1089560 31-JUL-13      1089565 31-JUL-13
         4          1          8   52428800        512          1 YES
INACTIVE               1089565 31-JUL-13      1089570 31-JUL-13

select * from v$logfile
    GROUP# STATUS  TYPE
---------- ------- -------
MEMBER
--------------------------------------------------------------------------------
IS_
---
         3         ONLINE
/u01/app/oracle/oradata/mdnss/redo03.log
NO
         2         ONLINE
/u01/app/oracle/oradata/mdnss/redo02.log
NO
所以在应用完所有归档日志文件之前 来试用输入在线日志 就 可以恢复到对应的SCN状态点
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/u01/app/oracle/oradata/mdnss/redo02.log
Log applied.
Media recovery complete.
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/u01/app/oracle/oradata/mdnss/redo02.log
Log applied.
Media recovery complete.
sql> alter database open resetlogs;
Database altered.
误删除的表已经回来了
sql> select count(*) from scott.daodao;
  COUNT(*) ----------          0

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