亲测 logminer挖掘

Posted 2020-08-19 张冲andy

LogMiner两种使用类型，一种是使用源数据库的数据字典分析DML操作，别一种是摘取LogMiner数据字典到字典文件分析DDL操作。
检查下suppplemental logging：
SQL> SELECT SUPPLEMENTAL_LOG_DATA_MIN FROM V$DATABASE;
如果是YES 或者IMPLICIT则表明已经生效了，否则需要启动：

安装LogMiner
查看系统中是否存在运行LogMiner所需要的dbms_logmnr、dbms_logmnr_d包,如果没有需要安装LogMiner工具，必须首先要运行下面这样两个脚本：
SQL> SELECT distinct name,text,line FROM DBA_SOURCE where type = ‘PACKAGE‘ and name = upper( ‘dbms_logmnr_d‘);
SQL> @?$ORACLE_HOME/rdbms/admin/dbmslm.sql
SQL> @?$ORACLE_HOME/rdbms/admin/dbmslmd.sql.
-- 创建数据字典文件之前需要配置LogMiner文件夹：
SQL> select * from dba_directories;
SQL> CREATE DIRECTORY utlfile AS ‘D:\oracle\oradata\practice\LOGMNR‘;
SQL> alter system set utl_file_dir=‘D:\oracle\oradata\practice\LOGMNR‘ scope=spfile;
SQL> SHOW PARAMETER utl_file_dir
--创建字典文件需要以DBA用户登录，创建到上面配置好的LogMiner文件夹中：
SQL> CONN LOGMINER/ [email protected] AS SYSDBA
SQL> EXECUTE dbms_logmnr_d.build(dictionary_filename => ‘dictionary.ora‘, dictionary_location =>‘D:\oracle\oradata\practice\LOGMNR‘);

SQL>alter database add supplemental log data;

Database altered.

 

SQL> select supplemental_log_data_min,supplemental_log_data_pk,supplemental_log_data_ui from v$database;

SUPPLEME SUP SUP
-------- --- ---
YES NO NO

 

--  Oracle的LogMiner可以分析在线（online）和归档（offline）两种日志文件，加入分析日志文件使用dbms_logmnr.add_logfile过程，第一个文件使用dbms_logmnr.NEW参数，后面文件使用dbms_logmnr.ADDFILE参数

SQL> col member for a50;

SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- -------------------------------------------------- ---
3 ONLINE /home/oracle/app/oradata/orcl/redo03.log NO
2 ONLINE /home/oracle/app/oradata/orcl/redo02.log NO
1 ONLINE /home/oracle/app/oradata/orcl/redo01.log NO

 

SQL> select group#,status from v$log;

GROUP# STATUS
---------- ----------------
1 INACTIVE
2 INACTIVE
3 CURRENT

 

SQL> select name from v$archived_log where name is not null order by 1;

no rows selected

 

SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LogFileName=>‘/home/oracle/app/oradata/orcl/redo03.log‘,Options=>dbms_logmnr.new);

PL/SQL procedure successfully completed.

SQL>EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LogFileName=>‘/home/oracle/app/oradata/orcl/redo03.log‘,Options=>dbms_logmnr.ADDFILE);

PL/SQL procedure successfully completed.

 

SQL> execute DBMS_LOGMNR.START_LOGMNR(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

 

 

SQL> col username for a10;
SQL> col sql_redo for a45;
SQL> select username,scn,timestamp,sql_redo from v$logmnr_contents where seg_name=‘ANDY‘ order by scn;

USERNAME SCN TIMESTAMP SQL_REDO
---------- ---------- --------- ---------------------------------------------
UNKNOWN 1301179 15-OCT-14 create table andy(id int);
UNKNOWN 1301259 15-OCT-14 insert into "ANDY"."ANDY"("ID") values (‘1‘);
ANDY 1301738 15-OCT-14 insert into "ANDY"."ANDY"("ID") values (‘2‘);
ANDY 1301743 15-OCT-14 insert into "ANDY"."ANDY"("ID") values (‘3‘);
ANDY 1301774 15-OCT-14 truncate table andy;