oracle 11g 之LogMiner分析重做日志实践

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1.安装LogMiner

以DBA用户身份运行下面2个脚本：

• dbmslm.sql用来创建DBMS_LOGMNR包，该包用来分析日志文件。
  

SQL> @$ORACLE_HOME/rdbms/admin/dbmslm.sql;Package created.Grant succeeded.Synonym created.

• dbmslmd.sql用来创建DBMS_LOGMNR_D包，该包用来创建数据字典文件。
  

SQL> @$ORACLE_HOME/rdbms/admin/dbmslmd.sql;Package created.Synonym created.

2.设置参数UTL_FILE_DIR

添加参数UTL_FILE_DIR,该参数值为服务器中放置数据字典文件的目录，

SQL> CREATE DIRECTORY utlfile AS '/home/oracle/logminer';Directory created.SQL> alter system set utl_file_dir='/home/oracle/logminer' scope=spfile;System altered.

重启数据库，生效上面的设置。

SQL> shutdown immediate;SQL> startup;SQL> show parameters utl_file_dir;

3.启动补充日志

     补充日志不是LogMiner日志分析必须的步骤，但是如果不启用补充日志，分析日志的的很多结果集信息就会显示为“UNKNOWN”，下面是开启最小补充日志。

SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;Database altered.SQL> SELECT SUPPLEMENTAL_LOG_DATA_MIN FROM V$DATABASE;SUPPLEME--------YES

4.创建专门的LogMiner用户

不是必须，实为管理安全方便。

5.创建数据字典

SQL> EXECUTE dbms_logmnr_d.build(dictionary_filename => 'dictionary.ora', dictionary_location =>'/home/oracle/logminer');

6.添加需要分析的在线日志或者归档日志

SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'
/home/oracle/flash_recovery_area/PRIMARY/archivelog/2016_04_25/o1_mf_1_199_ckv04o6w_.arc',OPTIONS => DBMS_LOGMNR.NEW);SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'
/home/oracle/flash_recovery_area/PRIMARY/archivelog/2016_04_25/o1_mf_1_201_ckv08jyp_.arc',OPTIONS => DBMS_LOGMNR.ADDFILE);PL/SQL procedure successfully completed.SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'
/home/oracle/flash_recovery_area/PRIMARY/archivelog/2016_04_25/o1_mf_1_200_ckv05pmp_.arc',OPTIONS => DBMS_LOGMNR.ADDFILE);PL/SQL procedure successfully completed.

7. 使用字典分析归档日志文件

SQL> EXECUTE dbms_logmnr.start_logmnr(dictfilename=>'/home/oracle/logminer/dictionary.ora');

8.在线日志分析实例

• 插入数据

SQL> insert into nn.t1 values(1000,'succ');1 row created.SQL> commit;Commit complete.

• 查询当前日志序列号

SQL>  SELECT group#, sequence#, status, first_change#, first_time FROM V$log ORD                                                                             ER BY first_change#;GROUP#  SEQUENCE# STATUS           FIRST_CHANGE# FIRST_TIM---------- ---------- ---------------- ------------- ---------1        208 INACTIVE               2825768 25-APR-162        209 INACTIVE               2825872 25-APR-163        210 CURRENT                2845771 25-APR-16

• 加入当前日志组

SQL> EXECUTE DBMS_LOGMNR.ADD_LOGFILE(LOGFILENAME =>'/home/oracle/oradata/orcl/redo03.log',OPTIONS => DBMS_LOGMNR.ADDFILE);PL/SQL procedure successfully completed.

• 使用LogMiner进行分析

SQL>  EXECUTE dbms_logmnr.start_logmnr(dictfilename=>'/home/oracle/logminer/dictionary.ora');PL/SQL procedure successfully completed.

• 查询分析结果

SQL> SELECT sql_redo, sql_undo, seg_owner FROM v$logmnr_contents WHERE seg_name='T1';SQL_REDO      SQL_UNDO          SEG_OWNERinsert into "NN"."T1"("TID","TNAME") values ('1000','succ');delete from "NN"."T1" where "TID" = '1000' and "TNAME" = 'succ' and ROWID = 'AAAR7YAAEAAAACrAAD';NN

9.关闭LogMiner会话

SQL> EXECUTE DBMS_LOGMNR.END_LOGMNR;

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