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Oracle 日志挖掘(LogMiner)使用详解

Logminer依赖于2个包:DBMS_LOGMNR和DBMS_LOGMNR_D,Oracle 11g默认已安装

Logminer 基本使用步骤

<1>. Specify a LogMiner dictionary.   指定Logminer字典

<2>. Specify a list of redo log files for analysis.   指定需要挖掘的redo或者archivelog日志文件

<3>. Start LogMiner.    开始日志挖掘

<4>. Request the redo data of interest.    查询V$LOGMNR_CONTENTS获取挖掘的结果

<5>. End the LogMiner session.    结束日志挖掘

日志挖掘使用示例:

1.开启补全日志:

SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA; 

2.找出需要挖掘的归档日志文件路径

SQL> SELECT NAME FROM V$ARCHIVED_LOGWHERE FIRST_TIME between to_date('2018-07-06 08:20:00','yyyy-mm-dd hh24:mi:ss') and to_date('2018-07-06 09:40:00','yyyy-mm-dd hh24:mi:ss') order by 1;
NAME
--------------------------------------------------------------------------------
/u01/app/archive/1_342433_904747849.dbf
/u01/app/archive/1_342434_904747849.dbf
/u01/app/archive/1_342435_904747849.dbf  

3.指定Logminer字典 (三选一)

Oracle 11g 指定Logminer字典有三种方法

1.Using the Online Catalog   使用在线目录

2.Extracting a LogMiner Dictionary to the Redo Log Files   抽取字典到redo日志文件中

3.Extracting the LogMiner Dictionary to a Flat File   抽取字典到平面文件中(需要设置UTL_FILE_DIR参数,重启数据库,不推荐)

EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);
OR
EXECUTE DBMS_LOGMNR_D.BUILD( OPTIONS=> DBMS_LOGMNR_D.STORE_IN_REDO_LOGS);
OR
EXECUTE DBMS_LOGMNR_D.BUILD('dictionary.ora', '/oracle/database/', DBMS_LOGMNR_D.STORE_IN_FLAT_FILE);  

4.Logminer中添加归档日志文件

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( LOGFILENAME => '/u01/app/archive/1_342433_904747849.dbf', OPTIONS => DBMS_LOGMNR.NEW); 

继续添加日志:

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( LOGFILENAME => '/u01/app/archive/1_342434_904747849.dbf', OPTIONS => DBMS_LOGMNR.ADDFILE);
EXECUTE DBMS_LOGMNR.ADD_LOGFILE( LOGFILENAME => '/u01/app/archive/1_342435_904747849.dbf', OPTIONS => DBMS_LOGMNR.ADDFILE);  

查看添加的日志列表:

select filename from V$LOGMNR_LOGS; 

5.开始日志挖掘 (三选一,与步骤3对应)

EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);
OR
EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_REDO_LOGS );
OR
EXECUTE DBMS_LOGMNR.START_LOGMNR(DICTFILENAME =>'/oracle/database/dictionary.ora'); 

6.获取挖掘结果

SELECT username AS USR, (XIDUSN || '.' || XIDSLT || '.' || XIDSQN) AS XID, 
SQL_REDO, SQL_UNDO FROM V$LOGMNR_CONTENTS WHERE username IN ('HR', 'OE');  

把挖取结果保存到指定表格中: create table logtab as select * from v$logmnr_contents;

7.结束日志挖掘

EXECUTE DBMS_LOGMNR.END_LOGMNR;  

总结

以上所述是小编给大家介绍的Oracle 日志挖掘(LogMiner)使用详解,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!

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