在上一篇的试验中使用logminer可以很容易的找到误删除的表，下面来看一个关于update的例子。

1.创建一个数据字典
EXECUTE dbms_logmnr_d.build( -
        dictionary_filename => 'dictionary.ora', -
        dictionary_location => '/home/oracle');

2.产生update语句
conn scott/tiger
update emp set sal=10,comm=20 where empno=7844;
commit;

3，为分析制定日志文件
conn / as sysdba
select member from v$logfile where group#=(select group# from v$log where status='CURRENT');

EXECUTE dbms_logmnr.add_logfile( -
        logfilename => '/oradata/PRACTICE/redo03.log', -
        options => dbms_logmnr.NEW);

查看将要分析的日志
select DB_NAME,THREAD_SQN,FILENAME from v$logmnr_logs;

DB_NAME                  THREAD_SQN FILENAME
------------------------ ---------- -----------------------------------------
PRACTICE 24 /oradata/PRACTICE/redo03.log

4，启动log miner
conn / as sysdba
EXECUTE dbms_logmnr.start_logmnr( -
        dictfilename => '/home/oracle/dictionary.ora');

查看统计信息，没有挖掘出任何数据
SELECT sql_redo,sql_undo
from v$logmnr_contents
where seg_name='EMP'
and seg_owner='SCOTT'
and seg_type_name='TABLE';

no rows selected

接下来有请今天的主角supplemental log

1，增加supplemental log
conn / as sysdba
alter database add supplemental log data;

SELECT supplemental_log_data_min FROM v$database;

SUPPLEMENTAL_LOG_DATA_MI
------------------------
YES

2，产生update语句
conn scott/tiger
SCOTT@PRACTICE >update emp set sal=10,comm=20 where empno=7844;

commit;

3,为分析制定日志文件
select member from v$logfile where group#=(select group# from v$log where status='CURRENT');

MEMBER
--------------------------------------------------------------------------------
/oradata/PRACTICE/redo03.log

SYS@PRACTICE >EXECUTE dbms_logmnr.add_logfile( -
>         logfilename => '/oradata/PRACTICE/redo03.log', -
>         options => dbms_logmnr.NEW);

SYS@PRACTICE >select DB_NAME,THREAD_SQN,FILENAME from v$logmnr_logs;

DB_NAME                  THREAD_SQN
------------------------ ----------
FILENAME
--------------------------------------------------------------------------------
PRACTICE                         24
/oradata/PRACTICE/redo03.log

4,启动log miner
SYS@PRACTICE >EXECUTE dbms_logmnr.start_logmnr( -
>         dictfilename => '/home/oracle/dictionary.ora');

PL/SQL procedure successfully completed.

SYS@PRACTICE >SELECT sql_redo,sql_undo
2 from v$logmnr_contents
3 where seg_name='EMP'
4 and seg_owner='SCOTT'
5 and seg_type_name='TABLE';

SQL_REDO
--------------------------------------------------------------------------------
SQL_UNDO
--------------------------------------------------------------------------------
update "SCOTT"."EMP" set "SAL" = '10', "COMM" = '20' where "SAL" = '100' and "CO
MM" = '200' and ROWID = 'AAASZHAAEAAAACXAAJ';
update "SCOTT"."EMP" set "SAL" = '100', "COMM" = '200' where "SAL" = '10' and "C
OMM" = '20' and ROWID = 'AAASZHAAEAAAACXAAJ';

实验成功，挖掘到了update语句。

关闭日志挖掘
execute dbms_logmnr.end_logmnr;

删除supplemental log
alter database drop supplemental log data;

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备份与恢复系列六续日志挖掘（Log Miner）找回update语句

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备份与恢复系列 六 续 日志挖掘（Log Miner）找回update语句

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备份与恢复系列六续日志挖掘（Log Miner）找回update语句