oracle不完全恢复之logminer工具的使用（一）
在进行不完全恢复案例演练之前，我们要先学会如何使用logminer工具。该工具主要对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）
1、对DML 分析
SQL> select * from scott.tb01;
ID
----------
1
2
3
3 rows selected.
SQL> delete from scott.tb01;
3 rows deleted.
SQL> commit;
Commit complete.
SQL> insert into scott.tb01 values(111);
1 row created.
SQL> insert into scott.tb01 values(222);
1 row created.
SQL> insert into scott.tb01 values(333);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from scott.tb01;
ID
----------
111
222
333
3 rows selected.
（1）查看当前日志组
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIVED STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --------- ---------- ------------- -------------------
1 1 1 104857600 3 YES INACTIVE 846224 2012-03-22 15:46:28
4 1 0 104857600 3 YES UNUSED 0
3 1 3 104857600 3 NO CURRENT 847894 2012-03-22 16:30:10
2 1 2 104857600 3 YES INACTIVE 846225 2012-03-22 15:47:06
SQL> alter system archive log current;――使当前日志组归档
System altered.
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIVED STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --------- ---------- ------------- -------------------
1 1 5 104857600 3 NO CURRENT 849696 2012-03-22 17:36:01
4 1 4 104857600 3 YES ACTIVE 849665 2012-03-22 17:34:34
3 1 3 104857600 3 YES ACTIVE 847894 2012-03-22 16:30:10
2 1 2 104857600 3 YES INACTIVE 846225 2012-03-22 15:47:06
4 rows selected.
*********************************以上接案例1***********************************
2、启用logmnr
（1）添加database补充日志
17:13:47 SQL> alter database add supplemental log data; ――不添加后面会出错
Database altered.
――查询日志（归档日志和当前日志）
SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIVED STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --------- ---------- ------------- -------------------
1 1 5 104857600 3 NO CURRENT 849696 2012-03-22 17:36:01
4 1 4 104857600 3 YES ACTIVE 849665 2012-03-22 17:34:34
3 1 3 104857600 3 YES ACTIVE 847894 2012-03-22 16:30:10
2 1 2 104857600 3 YES INACTIVE 846225 2012-03-22 15:47:06
4 rows selected.
SQL> col member for a50;
SQL> select member from v$logfile;――当前日志
MEMBER
--------------------------------------------------
/disk3/oradata/anny/redo01a.log
/disk3/oradata/anny/redo03a.log
/disk3/oradata/anny/redo02a.log
/disk3/oradata/anny/redo04a.log
/disk1/oradata/anny/redo01b.log
/disk1/oradata/anny/redo02b.log
/disk1/oradata/anny/redo03b.log
/disk1/oradata/anny/redo04b.log
/disk2/oradata/anny/redo01c.log
/disk2/oradata/anny/redo02c.log
/disk2/oradata/anny/redo03c.log
/disk2/oradata/anny/redo04c.log
SQL> col name for a50
SQL> select name from v$archived_log;――查看归档日志信息
/disk1/arch/anny/arch_1_1_778514791.log
/disk1/arch/anny/arch_1_2_778514791.log
/disk1/arch/anny/arch_1_3_778514791.log
/disk1/arch/anny/arch_1_4_778514791.log
/disk1/arch/anny/arch_1_5_778514791.log
/disk1/arch/anny/arch_1_6_778514791.log
/disk1/arch/anny/arch_1_7_778514791.log
/disk1/arch/anny/arch_1_8_778514791.log
/disk1/arch/anny/arch_1_9_778514791.log
/disk1/arch/anny/arch_1_2_778607188.log
/disk1/arch/anny/arch_1_3_778607188.log
/disk1/arch/anny/arch_1_4_778607188.log
37 rows selected.
（2）添加日志，分析【添加的日志应该是切换前的日志，归档日志是最后一个日志】
SQL> execute dbms_logmnr.add_logfile(logfilename=>'/disk1/arch/anny/arch_1_4_778607188.log',options=>dbms_logmnr.new);
PL/SQL procedure successfully completed.
SQL> execute dbms_logmnr.add_logfile(logfilename=>'/disk3/oradata/anny/redo03a.log',options=>dbms_logmnr.addfile);
PL/SQL procedure successfully completed.
（3）执行logmnr 分析
SQL> execute dbms_logmnr.start_logmnr(options=>dbms_logmnr.dict_from_online_catalog);
PL/SQL procedure successfully completed.
（4）查询分析结果
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
Session altered.
SQL> col username for a15
SQL> col sql_redo for a50
SQL> select username,scn,timestamp,sql_redo from v$logmnr_contents where seg_name='TB01';
USERNAME SCN TIMESTAMP SQL_REDO
--------------- ---------- ------------------- --------------------------------------------------
849589 2012-03-22 17:31:08 delete from "SCOTT"."TB01" where "ID" = '1' and RO
WID = 'AAACc0AAFAAAAAYAAA';
849589 2012-03-22 17:31:08 delete from "SCOTT"."TB01" where "ID" = '2' and RO
WID = 'AAACc0AAFAAAAAYAAB';
849589 2012-03-22 17:31:08 delete from "SCOTT"."TB01" where "ID" = '3' and RO
WID = 'AAACc0AAFAAAAAYAAC';
849599 2012-03-22 17:31:35 insert into "SCOTT"."TB01"("ID") values ('111');
849621 2012-03-22 17:32:41 insert into "SCOTT"."TB01"("ID") values ('222');
849623 2012-03-22 17:32:47 insert into "SCOTT"."TB01"("ID") values ('333');
6 rows selected.
（5）结束日志分析
SQL> execute dbms_logmnr.end_logmnr;
PL/SQL procedure successfully completed.
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