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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极客世界网站的支持! |
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