Logminer依賴于2個(gè)包：DBMS_LOGMNR和DBMS_LOGMNR_D，Oracle 11g默認(rèn)已安裝
Logminer 基本使用步驟
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. 開(kāi)始日志挖掘
4>. Request the redo data of interest. 查詢V$LOGMNR_CONTENTS獲取挖掘的結(jié)果
5>. End the LogMiner session. 結(jié)束日志挖掘
日志挖掘使用示例：
1.開(kāi)啟補(bǔ)全日志：
SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
2.找出需要挖掘的歸檔日志文件路徑
SQL> SELECT NAME FROM V$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 (三選一)
Oracle 11g 指定Logminer字典有三種方法
1.Using the Online Catalog 使用在線目錄
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（需要設(shè)置UTL_FILE_DIR參數(shù)，重啟數(shù)據(jù)庫(kù)，不推薦）
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中添加歸檔日志文件
EXECUTE DBMS_LOGMNR.ADD_LOGFILE( LOGFILENAME => '/u01/app/archive/1_342433_904747849.dbf', OPTIONS => DBMS_LOGMNR.NEW);
繼續(xù)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$LOGMNR_LOGS;
5.開(kāi)始日志挖掘 (三選一，與步驟3對(duì)應(yīng))
EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);
OR
EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => DBMS_LOGMNR.DICT_FROM_REDO_LOGS );
OR
EXECUTE DBMS_LOGMNR.START_LOGMNR(DICTFILENAME =>'/oracle/database/dictionary.ora');
6.獲取挖掘結(jié)果
SELECT username AS USR, (XIDUSN || '.' || XIDSLT || '.' || XIDSQN) AS XID,
SQL_REDO, SQL_UNDO FROM V$LOGMNR_CONTENTS WHERE username IN ('HR', 'OE');
把挖取結(jié)果保存到指定表格中： create table logtab as select * from v$logmnr_contents;
7.結(jié)束日志挖掘
EXECUTE DBMS_LOGMNR.END_LOGMNR;
總結(jié)
以上所述是小編給大家介紹的Oracle 日志挖掘(LogMiner)使用詳解，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
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