使用log miner分析oracle日志的方法
来源：爱站网时间：2019-11-12编辑：网友分享
当我们因为误操作不小心导致数据丢失或者改变的时候我们就需要对数据库对象进行恢复，但是我们无法精准的找出需要的数据，那么这时候我们就需要用log miner分析oracle日志，那么下面小编就将介绍使用log miner分析oracle日志的方法。
当我们因为误操作不小心导致数据丢失或者改变的时候我们就需要对数据库对象进行恢复，但是我们无法精准的找出需要的数据，那么这时候我们就需要用log miner分析oracle日志，那么下面小编就将介绍使用log miner分析oracle日志的方法。
oracle db提供了一个分析日志包logmnr
logminer 工具的使用
-------对redo log 进行挖掘，找出在某个时间点所作的DDL 或DML 操作（包括：时间点、datablock scn 、sql语句）
实验测试
SQL> select name from v$archived_log; NAME -------------------------------------------------- /oracle/arch1/1_2_883536782.dbf SQL> SQL> SQL> delete from scott.t1; 576 rows deleted. SQL> alter system archive log current; System altered. SQL> create table scott.t6 as select * from scott.emp; Table created. SQL> alter system archive log current; System altered. SQL> select name from v$archived_log; NAME -------------------------------------------------- /oracle/arch1/1_2_883536782.dbf /oracle/arch1/1_3_883536782.dbf /oracle/arch1/1_4_883536782.dbf
--启动log miner添加要分析的日志
SQL> execute dbms_logmnr.add_logfile(logfilename=>'/oracle/arch1/1_2_883536782.dbf',options=>dbms_logmnr.new); PL/SQL procedure successfully completed.
--添加需要分析的日志
SQL> execute dbms_logmnr.add_logfile(logfilename=>'/oracle/arch1/1_3_883536782.dbf',options=>dbms_logmnr.addfile); PL/SQL procedure successfully completed. SQL> execute dbms_logmnr.add_logfile(logfilename=>'/oracle/arch1/1_4_883536782.dbf',options=>dbms_logmnr.addfile) PL/SQL procedure successfully completed.
--执行log miner
SQL> execute dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog); PL/SQL procedure successfully completed.
--查询分析结果
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
Session altered.
SQL> select username,scn,timestamp,sql_redo from v$logmnr_contents where seg_name='T1';
USERNAME SCN TIMESTAMP
------------------------------ ---------- -------------------
SQL_REDO
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
delete from "SCOTT"."T1" where "EMPNO" = '7782' and "ENAME" = 'CLARK' and "JOB" = 'MANAGER' and "MGR" = '7839' and "HIREDATE" = TO_DATE('1981-06-09 00:00:00', 'yyyy-mm-dd hh24:mi:ss') and "SAL" = '245
0' and "COMM" IS NULL and "DEPTNO" = '10' and ROWID = 'AAAVbSAAFAAAACXABi';
SYS 1494545 2015-06-28 04:24:44
delete from "SCOTT"."T1" where "EMPNO" = '7839' and "ENAME" = 'KING' and "JOB" = 'PRESIDENT' and "MGR" IS NULL and "HIREDATE" = TO_DATE('1981-11-17 00:00:00', 'yyyy-mm-dd hh24:mi:ss') and "SAL" = '500
0' and "COMM" IS NULL and "DEPTNO" = '10' and ROWID = 'AAAVbSAAFAAAACXABj';
SYS 1494545 2015-06-28 04:24:44
delete from "SCOTT"."T1" where "EMPNO" = '7844' and "ENAME" = 'TURNER' and "JOB" = 'SALESMAN' and "MGR" = '7698' and "HIREDATE" = TO_DATE('1981-09-08 00:00:00', 'yyyy-mm-dd hh24:mi:ss') and "SAL" = '1
。。。。。
--结束log miner 分析
SQL> execute dbms_logmnr.end_logmnr; PL/SQL procedure successfully completed.
以上就是使用log miner分析oracle日志的方法，希望大家可以喜欢。遇到类似问题的朋友不妨借鉴学习下，如果还有疑问，请在本文底部留言吧。
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