day14_oracle数据库备份 恢复

临时表空间恢复1.建立临时表空间SQL> create temporary tablespace temp123 tempfile '/u01/app/oracle/oradata/orcl/temp123.dbf' size 20M;
2.更改为默认SQL> alter database default temporary tablespace temp123;
3.SQL> drop tablespace temp;(删除)==========================================================日志文件,控制文件恢复
1.删除2个日志文件[oracle@sq orcl]$ rm -rf redo01.log redo03.log
删除所有控制文件[oracle@sq orcl]$ rm -rf *.ctl
2.SQL> startup force(报错)
3.
CREATE CONTROLFILE REUSE DATABASE "ORCL" RESETLOGS ARCHIVELOG MAXLOGFILES 16 MAXLOGMEMBERS 3 MAXDATAFILES 100 MAXINSTANCES 8 MAXLOGHISTORY 292LOGFILE GROUP 1 '/u01/app/oracle/oradata/orcl/redo01.log' SIZE 50M, GROUP 2 '/u01/app/oracle/oradata/orcl/redo02.log' SIZE 50M, GROUP 3 '/u01/app/oracle/oradata/orcl/redo03.log' SIZE 50M-- STANDBY LOGFILEDATAFILE '/u01/app/oracle/oradata/orcl/system01.dbf', '/u01/app/oracle/oradata/orcl/undotbs01.dbf', '/u01/app/oracle/oradata/orcl/sysaux01.dbf', '/u01/app/oracle/oradata/orcl/users01.dbf', '/u01/app/oracle/oradata/orcl/aaa.dbf'CHARACTER SET WE8ISO8859P1;
4.SQL> select open_mode from v$database;5.SQL> alter database open;(报错)ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;(报错)
SQL> recover database; (报错)
查看恢复目录SQL> show parameter DB_RECOVERY_FILE_DEST

SQL> recover database using BACKUP CONTROLFILE;(using backup controlfile. 恢复就不会受“当前controlfile所纪录的SCN”的限制) 成功提示中输入: /u01/app/oracle/oradata/orcl/redo02.log (当前就一个日志文件)
SQL> alter database open resetlogs;
==========================================部分数据库恢复1.SQL> alter tablespace users begin backup; [oracle@sq orcl]$ cp users01.dbf /home/oracle/db_bak/
2.SQL> alter tablespace users end backup; 3.SQL> create table tt as select * from dba_objects; SQL> select count(*) from tt; SQL> commit;
4.[oracle@sq orcl]$ rm -rf users01.dbf (模拟损坏)
5.SQL> alter system flush buffer_cache;SQL> conn sys/123456 as sysdba
6.SQL> startup force;(报错 缺少4号文件)
7.SQL> alter database datafile 4 offline; [oracle@sq orcl]$ cp /home/oracle/db_bak/users01.dbf .
8.SQL> recover datafile 4;SQL> alter database datafile 4 online;
9.SQL> startup force;

============================================完全数据库恢复步骤跟上面一样recover database
============================================归档模式数据文件恢复1.SQL> create tablespace tbs_recover datafile '/oracle/app/oradata/TEST/tbs_recover.dbf' size 10M;
2.SQL> create table tab_recover tablespace tbs_recover as select * from dba_objects;SQL> commit;
3.SQL> alter system switch logfile;SQL> /
4.[oracle@sq123 TEST]$ rm -rf tbs_recover.dbf
5.SQL> alter system flush buffer_cache;
6.SQL> conn sys/123456 as sysdba SQL> select * from tab_recover;(报错)
7.SQL> alter database datafile 5 offline;
8.SQL> alter database create datafile '/oracle/app/oradata/TEST/tbs_recover.dbf';(创建出表空间)
9.SQL> alter database datafile 5 online;(报错)SQL> recover datafile 5;AUTO
10.SQL> alter database datafile 5 online;(成功) SQL> select * from tab_recover;(数据回来了)
=============================================不完全数据库恢复
日志挖掘技术确定误操作时间与scn
查看当前时间
alter database begin backup;cp *.dbf /home/oracle/db_bakalter database end backup;
SQL> select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual; 2012-04-24 07:20:34SQL> drop table tab_recover;
1.日志挖掘技术,确定误删除表的时间[oracle@sq123 ~]$ mkdir logminer
存储目录SQL> alter system set utl_file_dir='/home/oracle/logminer' scope=spfile;SQL> shutdown immediateSQL> startup
2.创建存储数据字典文件的文件SQL> execute dbms_logmnr_d.build('shwdict.ora','/home/oracle/logminer');
cd /home/oracle/logminer/
3.SQL> execute dbms_logmnr.add_logfile('/oracle/app/flash_recovery_area/TEST/archivelog/2012_03_12/o1_mf_1_9_7osoj41g_.arc',dbms_logmnr.new);
4.挖掘数据SQL> exec dbms_logmnr.start_logmnr (dictfilename=>'/home/oracle/logminer/shwdict.ora');
5.SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

SQL> select SCN,TIMESTAMP,SQL_REDO from v$LOGMNR_CONTENTS where SQL_REDO like '%drop%';结果: 716922 2012-03-12 06:12:38drop table tab_recover AS "BIN$uv7sdpUIi1TgQAB/AQByfw==$0" ;

恢复数据
6.SQL> shutdown abort;SQL> startup mount[oracle@sq123 db_bak]$ cp *.dbf /oracle/app/oradata/TEST/
SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

7.SQL> recover database until time '2012-04-24 07:20:34';
SQL> alter database open resetlogs;

8.SQL> conn sys/123456 as sysdbaSQL> select count(*) from tab_recover; (数据恢复出来了)

=============================================日志文件恢复1.[oracle@sq orcl]$ rm *.log SQL> startup force(报错)
2.SQL> alter database open resetlogs;(报错)
3.SQL> recover database until cancel;(执行RECOVER命令，在提示输入归档日志时，应用这些归档日志提示输入归档日志序列号时，不输入这个文件的名称或者不接受建议的名称，而是输入CANCEL)
(恢复不能成功,因为我们没有归档日志了)
4.添加隐藏参数SQL> alter system set "_allow_resetlogs_corruption"=true scope=spfile;(强制启动数据库，设置此参数之后，在数据库Open过程中，Oracle会跳过某些一致性检查，从而使数据库可能跳过不一致状态，Open打开)
5.SQL> startup force SQL> alter database open resetlogs; (可以启动,但是刚才没有同步到硬盘的数据丢失了)

--后续操作SQL> create pfile from spfile然后vi pfile文件 删除 *._allow_resetlogs_corruptionSQL> create spfile from pfile;SQL> startup force
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来自为知笔记(Wiz)