手工热备（开库状态）
备份控制文件：
alter database backup controlfile to ‘/u01/oradata/prod/con.bak1‘;
备份数据文件（这里用到pl/sql进行批处理,将查询结果粘贴运行即可）
begin
for i in (select tablespace_name from dba_tablespaces) loop
dbms_output.put_line(‘alter tablespace ‘||i.tablespace_name||‘ begin backup;‘);
for j in (select file_name from dba_data_files where tablespace_name=i.tablespace_name) loop
dbms_output.put_line(‘host cp ‘||j.file_name||‘ /home/oracle/hot_backup‘);
end loop;
dbms_output.put_line(‘alter tablespace ‘||i.tablespace_name||‘ end backup;‘);
end loop;
end;
模拟现场，举例
1.删除emp1表 drop table emp1 purge;(不完全恢复)
模拟：
drop table emp1 purge;
select * from v$log;
alter system switch logfile;
/
解决：
select name from v$archived_log;(可以看到删除的日志条目切换到此归档日志里了)
/u01/flash_recovery_area/PROD/archivelog/2017_08_13/o1_mf_1_6_drzyyodl_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_08_27/o1_mf_1_7_dt4yy16z_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_08_27/o1_mf_1_8_dt4zlzff_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_08_27/o1_mf_1_9_dt4zow6g_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_08_27/o1_mf_1_1_dt5fpkxt_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_11_12/o1_mf_1_2_f0jh6xf2_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_11_12/o1_mf_1_3_f0jk4n4p_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_11_13/o1_mf_1_1_f0lkgyt6_.arc
/u01/flash_recovery_area/PROD/archivelog/2017_11_13/o1_mf_1_2_f0lo0fom_.arc
因为今天13号所以选这两条日志，也可以多切换几次日志多生成几个日志条目
接下来进行时间的挖掘（基于时间点来恢复）
mkdir -p /home/oracle/logmnr
show parameter utl_file_dir
alter system set utl_file_dir=‘/home/oracle/logmnr‘ scope=spfile;
startup force;
show parameter utl_file_dir;
alter database add supplemental log data;
execute dbms_logmnr_d.build(‘dict.ora‘,‘/home/oracle/logmnr‘,dbms_logmnr_d.store_in_flat_file);
execute dbms_logmnr.add_logfile(logfilename=>‘/u01/flash_recovery_area/PROD/archivelog/2017_11_13/o1_mf_1_1_f0lkgyt6_.arc‘,options=>dbms_logmnr.new);
execute dbms_logmnr.add_logfile(logfilename=>‘/u01/flash_recovery_area/PROD/archivelog/2017_11_13/o1_mf_1_2_f0lo0fom_.arc‘,options=>dbms_logmnr.addfile);
execute dbms_logmnr.start_logmnr(dictfilename=>‘/home/oracle/logmnr/dict.ora‘,options=>dbms_logmnr.ddl_dict_tracking);
select username,scn,to_char(timestamp,‘yyyy-mm-dd hh24:mi:ss‘) time,sql_redo from v$logmnr_contents WHERE lower(sql_redo) like ‘drop table%‘;
execute dbms_logmnr.end_logmnr;
USERNAME SCN TIME
------------------------------ ---------- -------------------
SQL_REDO
------------------------------------------------------------
UNKNOWN 954522 2017-11-13 16:03:53
drop table emp1 purge;
（记录此时间2017-11-13 16:03:53）
shutdown abort;
时间挖掘完成。
cd /home/oradata/prod
rm *.dbf
cp /home/oracle/hot_backup/*.dbf ./
startup;
recover database until time ‘2017-11-13 16:03:53‘;auto
alter database open resetlogs;
验证查看
select * from emp1;
成功找回此表，同样可以通过scn号寻找恢复，但是不能用闪回表因为我是purge彻底删除，只能不完全恢复。
2.模拟user01.dbf 介质损坏
rm -rf /u01/oradata/prod/users01.dbf
例如shutdown immediate
[email protected]>shutdown immediate
ORA-01116: 打开数据库文件 4 时出错
ORA-01110: 数据文件 4: ‘/u01/oradata/prod/users01.dbf‘
ORA-27041: 无法打开文件
解决：
alter system flush buffer_cache;
alter tablespace users offline immediate;
cp /home/oracle/hot_backup/users01.dbf /u01/oradata/prod/
recover tablespace users;auto
alter tablespace users online;
3.模拟undotbs1 介质损坏(恢复的方法多种我只演示根据文件号恢复)
select name from v$datafile;
rm -rf /u01/oradata/prod/undotbs01.dbf
shutdown abort
解决：
[email protected]>select FILE#,ERROR from v$recover_file;
FILE# ERROR
---------- -----------------------------------------------------------------
1 UNKNOWN ERROR
2 UNKNOWN ERROR
3 FILE NOT FOUND
[email protected]>select FILE#,NAME from v$datafile;
FILE# NAME
--------------------------------------------------
1 /u01/oradata/prod/system01.dbf
2 /u01/oradata/prod/sysaux01.dbf
3 /u01/oradata/prod/undotbs01.dbf
4 /u01/oradata/prod/users01.dbf
5 /u01/oradata/prod/example01.dbf
[email protected]>select file#,checkpoint_change# from v$datafile_header;
FILE# CHECKPOINT_CHANGE#
---------- ------------------
1 975649
2 975649
3 0
4 975649
5 975649
确定3号文件损坏
cp /home/oracle/hot_backup/undotbs01.dbf /u01/oradata/prod/
recovere datafile 3;auto
alter database open;
4.当前日志，介质损坏
create table t2(id int);
insert into t2 values(100);
commit;
alter system archive log current;
insert into t2 values(200);
commit;
select * from scott.t2;
select group#,sequence#,status from v$log;
select GROUP#,MEMBER from v$logfile;
查出当前的日志是组号是1对应的redo01.log
模拟 rm -rf /u01/oradata/prod/redo01.log
shutdown abort
startup
数据库装载完毕。
ORA-00313: 无法打开日志组 1 (用于线程 1) 的成员 ORA-00312:
联机日志 1 线程 1: ‘/u01/oradata/prod/redo01.log‘
ORA-27037: 无法获得文件状态 Linux
Error: 2: No such file or directory
Additional information: 3
解决:
cd /u01/oradata/prod/
rm *.dbf
cp /home/oracle/hot_backup/*.dbf ./
startup
recover database until cancel;auto
recover database until cancel;cancel
alter database open resetlogs;
select * from scott.t1;
ID
----------
100
5.控制文件损坏
rm -rf /u01/oradata/prod/control01.ctl
rm -rf /u01/flash_recovery_area/prod/control02.ctl
shutdown abort
startup
ORA-00205: ?????????, ??????, ???????
select status from v$instance;
解决：
cp /home/oracle/control01.ctl /u01/oradata/prod/
cp /home/oracle/control02.ctl /u01/flash_recovery_area/prod/
recover database using backup controlfile;auto
recover database using backup controlfile;当前的日志
alter database open resetlogs;