?1、數(shù)據(jù)庫處于歸檔模式

???????? 查看命令???????? SQL> archive log line

2、備份數(shù)據(jù)庫中的所有數(shù)據(jù)文件

???????? 聲明數(shù)據(jù)庫備份????????????? SQL> alter database begin backup;

???????? 創(chuàng)建一目錄 mkdir /home/oracle/db_bak2

???????? 拷貝所有的.dbf文件????? cp /oracle/app/oradata/TEST/*.dbf ?/home/oracle/db_bak2/

???????? 結(jié)束備份狀態(tài)?????????????????? alter database end backup;

3、模擬丟失數(shù)據(jù)， 刪掉數(shù)據(jù)庫中的abc表???? SQL> drop table abc;

4、使用日志挖掘技術(shù)，確定誤刪除表的時(shí)間

???????? 1、創(chuàng)建一個(gè)目錄（放置提取出的文件）[oracle@sql1 ~]$ mkdir logminer

???????? 2、指定存儲目錄?

??????????????????????????? SQL>alter system set utl_file_dir='/home/oracle/logminer' scope=spfile;

???????? 3、建立日志挖掘的數(shù)據(jù)字典

??????????????????????????? SQL>execute dbms_logmnr_d.build('shwdict.ora','/home/oracle/logminer');

???????? 4、創(chuàng)建分析的文件列表（可以使歸檔日志或日志文件）

???????? SQL> execute ??????????????????????????? ???? ???????? ???????? dbms_logmnr.add_logfile('/oracle/app/oradata/TEST/redo01.log',dbms_logmnr.new);

???????? SQL> execute ??????????????????????????? ???? ???????? ???????? dbms_logmnr.add_logfile('/oracle/app/oradata/TEST/redo02.log',dbms_logmnr.new);

???????? SQL> execute ??????????????????????????? ???? ???????? ???????? dbms_logmnr.add_logfile('/oracle/app/oradata/TEST/redo03.log',dbms_logmnr.new);

???????? 5、開始挖掘數(shù)據(jù)

???????? SQL> exec dbms_logmnr.start_logmnr(dictfilename=>'/home/oracle/logminer/shwdict.ora');

???????? 6、設(shè)置回話的時(shí)間格式

?????????????????? SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

???????? 7、查看分析內(nèi)容

?????????????????? SQL> select scn, timestamp, sql_redo from v$logmnr_contents where sql_redo ??????????????????????????????????? like'%drop%';

?

?????? ??????????? SCN ?????? ?????????????????? TIMESTAMP ??????????? ???????? SQL_REDO????????????????

?????????????????? ????????

?????????????????? ???????? 798149 ?------ 2013-04-16 20:47:08? ----- ?drop table abc -----

?? ? 8、結(jié)束分析

?????????????????? SQL>execute dbms_logmnr.end_logmnr;

5、數(shù)據(jù)恢復(fù)

???????? 1、關(guān)閉數(shù)據(jù)庫進(jìn)入mount模式

?????????????????? SQL> shutdown immediate

?????????????????? SQL> startup mount

???????? 2、還原所有的數(shù)據(jù)文件

?????????????????? [oracle@sql1 ~]$ cp db_bak2/*.dbf /oracle/app/oradata/TEST/

???????? 3、設(shè)置會話的時(shí)間格式

?????????????????? SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

???????? 4、恢復(fù)數(shù)據(jù)庫到時(shí)間點(diǎn)

?????????????????? SQL> recover database until time '2013-04-16 20:47:08';

???????? 5、重置日志打開數(shù)據(jù)庫

?????????????????? SQL> alter database open resetlogs;

???????? 6、查看數(shù)據(jù)是否恢復(fù)

?????????????????? SQL> select count(*) from abc;???????????????? 數(shù)據(jù)恢復(fù)出來了

??????????????????

???????? ????????

? ? ? ? ? ? ? ? ? ? ? ? ? ??

轉(zhuǎn)載于:https://blog.51cto.com/6274815/1179563

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