Oracle logminer 分析redo log
Oracle 11g r2 RAC centos 6.5
设置时间格式
select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') date_format from dual ;
查看数据库是否开启补全日志功能
select
SUPPLEMENTAL_LOG_DATA_MIN,
SUPPLEMENTAL_LOG_DATA_PK,
SUPPLEMENTAL_LOG_DATA_UI,
SUPPLEMENTAL_LOG_DATA_FK,
SUPPLEMENTAL_LOG_DATA_ALL from v$database;
开启补全日志
alter database add supplemental log data;
alter database add supplemental log data (primary key, unique,foreign key) columns;
再次查询检查是否开启
开启归档--详细见归档的开启
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination +FRA/bol/arch
Oldest online log sequence 93
Next log sequence to archive 95
Current log sequence 95
配置LogMiner工具
SQL> show parameter UTL_FILE
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
utl_file_dir string
1 利用toad自带的工具logminer
dml 操作
select *from TESTYHQ;
insert into TESTYHQ(id1,name1)values (2,'hq');
commit;
利用toad的logminer直接分析redo
select * from V$LOGFILE;
select group#,sequence#,bytes,members,status from v$log;
toad-database-diagnose-logminer
选择online logs，输入redo文件全路径，比如
+DATA/bol/onlinelog/group_2.258.990861405
再选择时间范围，选择过大的话，日志会有很多，完成后点击finish，直接生成记录
可以用sql进行筛选查看
select scn,timestamp,operation,seg_owner,seg_name,
table_space,row_id,username,os_username,machine_name,
session#,serial#,sql_redo,sql_undo from v$logmnr_contents where seg_owner='SDE';
几个关键字段，username,machine_name,session#,serial#,sql_redo,sql_undo，可以清楚的看见
scn，时间，操作内容，表名，操作的机器名字，和操作语句，以及undo内容
2 利用plsql进行分析
[root@rac1 /]# mkdir u02
[root@rac1 /]# chown oracle:oinstall /u02
alter system set utl_file_dir='/u02' scope=spfile; --需要重启db
SQL> show parameter UTL_FILE
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
utl_file_dir string /u02
[root@rac1 admin]# ls dbmslm*
dbmslmd.sql dbmslm.sql dbmslms.sql
[root@rac1 admin]# pwd
/u01/app/11.2.0/grid/rdbms/admin
SQL> @/u01/app/11.2.0/grid/rdbms/admin/dbmslmd.sql
SQL> @/u01/app/11.2.0/grid/rdbms/admin/dbmslm.sql
SQL> @/u01/app/11.2.0/grid/rdbms/admin/dbmslms.sql
SQL> execute dbms_logmnr_d.build(dictionary_filename =>'dfdict.data',dictionary_location =>'/u02');
PL/SQL procedure successfully completed.
--- 如果报错，请检查目录及权限
*
ERROR at line 1:
ORA-01336: specified dictionary file cannot be opened
ORA-29283: invalid file operation
ORA-06512: at "SYS.UTL_FILE", line 536
ORA-29283: invalid file operation
ORA-06512: at "SYS.DBMS_LOGMNR_INTERNAL", line 6110
ORA-06512: at "SYS.DBMS_LOGMNR_INTERNAL", line 6200
ORA-06512: at "SYS.DBMS_LOGMNR_D", line 12
ORA-06512: at line 1
--
insert into TESTYHQ(id1,name1)values (444,'hq');
commit;
select group#,sequence#,bytes,members,status from v$log;
select * from V$LOGFILE;
SQL> alter system switch logfile;
----
因为这里只有一个日志，那么只需要添加一个就好了(第一个日志用new“=>dbms_logmnr.new”)
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.new,logfilename =>'/u01/app/oracle/oradata/or11g/redo01.log');
如果是有多个日志，那么就继续添加(添加其他日志用add“=>dbms_logmnr.addfile”)：
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.addfile,logfilename=>'/u01/app/oracle/oradata/or11g/redo02.log');
dbms_logmnr.new --用于建一个日志分析表
dbms_logmnr.addfile --用于加，入用于分析的日志文件
dbms_logmnr.removefile --用于移出，用于分析的日志文件
如果是删除日志就用removefile，如：
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.removefile,logfilename =>'/u01/app/oracle/oradata/or11g/redo03.log');
---
SQL> alter system switch logfile;
System altered.
SQL> exec dbms_logmnr.add_logfile('+DATA/bol/onlinelog/group_1.257.990861405',dbms_logmnr.new);
PL/SQL procedure successfully completed.
SQL> exec dbms_logmnr.start_logmnr(dictfilename=>'/u02/dfdict.data');
PL/SQL procedure successfully completed.
select scn,timestamp,operation,seg_owner,seg_name,
table_space,row_id,username,os_username,machine_name,
session#,serial#,sql_redo,sql_undo from v$logmnr_contents where seg_owner='SDE';
create table t01 as select scn,timestamp,operation,seg_owner,seg_name,
table_space,row_id,username,os_username,machine_name,
session#,serial#,sql_redo,sql_undo from v$logmnr_contents where seg_owner='SDE';
--v$logmnr_contents 针对于session，其他session执行该查询就会报错
ORA-01306: 在从v$logmnr_contents中选择之前必须调用dbms_logmnr.start_logmnr()
select *from t01;
SQL> exec dbms_logmnr.end_logmnr;--关闭日志挖掘
PL/SQL procedure successfully completed.
select *from t01;
