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 hh34:mi:ss') and to_date('2018-07-06 09:40:00','yyyy-mm-dd hh34: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);OREXECUTE DBMS_LOGMNR_D.BUILD( OPTIONS=> DBMS_LOGMNR_D.STORE_IN_REDO_LOGS);OREXECUTE 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);OREXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_REDO_LOGS );OREXECUTE 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网站的支持！