如何使用log miner分析oracle日志

当我们不小心误操作致使数据库数据丢失、改变时， 需要对数据库对象做基于时间点的恢复，找到我们需要的数据，这个时间点不能认为精确确定，我们可以通过对oracle日志进行分析，而获得无操作的精确时间点。
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.

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