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);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;
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！
