巧用Oracle備份集在測試機上做不完全恢復

如果表的許多分區被意外drop，需要利用帶庫上的備份集在測試機上做不完全恢復，而具體日期需要達到一個特定的時間，那么我們可以參考下文中的解決方法。

◆首先需要用logminer查出刪除語句：

uncompress /oracle/oradata/xxx/xxx.ARC.Z ...beginsys.dbms_logmnr.add_logfile('/oracle/oradata/xxx/xxx.ARC');...end;begin sys.dbms_logmnr.start_logmnr(Options => sys.dbms_logmnr.DICT_FROM_ONLINE_CATALOG); end;create table xsb_logminer_1 as select timestamp, seg_name,operation, sql_redo from V$LOGMNR_CONTENTS where seg_owner='XXX' and operation='DDL' and sql_redo like 'ALTER TABLE XXX DROP PARTITION %';BEGIN sys.dbms_logmnr.end_logmnr();END;

◆然后在生產庫上創建pfile：

create pfile='...' from spfile;

需要從帶庫上恢復rman備份集至生產機上,將此備份集FTP至測試機上，連同pfile文件.

在測試機上創建與生產機上相同目錄，admin ...

在測試機上創建新實例：

orapwd file=... password=xxx

然后修改pfile文件內容，改變control_files內容。

◆啟動新實例

export ORACLE_SID=xxxsqlplus / as sysdbastartup nomount pfile='/home/oracle/init_xxx.ora';create spfile from pfile='/home/oracle/init_xxx.ora';exitRMAN target sys/xxxrestore controlfile from '...';startup mount--crosscheck backup;list backup;run {set newname for datafile 1 to '/oracle/oradata/xxx/system01.dbf';set newname for datafile 2 to '/oracle/oradata/xxx/undo01.dbf';set newname for datafile 3 to '/oracle/oradata/xxx/sysaux01.dbf';set newname for datafile 6 to '/oracle/oradata/xxx/pay_ts01.dbf';restore datafile 1;restore datafile 2;restore datafile 3; restore datafile 6;}(注：發現單個datafile恢復不如整庫恢復快！)sql 'alter database backup controlfile to trace';shutdown immediate;exit

然后修改controlfile文件內容，去掉不用的文件名

◆不完全恢復數據庫:

sqlplus / as sysdbastartup nomount;

◆重建控制文件

CREATE CONTROLFILE REUSE DATABASE 'XXX' RESETLOGS ARCHIVELOGMAXLOGFILES 40MAXLOGMEMBERS 3MAXDATAFILES 400MAXINSTANCES 2MAXLOGHISTORY 454LOGFILEGROUP 1 ('/oracle/oradata/xxx/rdb_redo01a') SIZE 10M,GROUP 2 ('/oracle/oradata/xxx/rdb_redo02a') SIZE 10MDATAFILE '/oracle/oradata/xxx/system01.dbf','/oracle/oradata/xxx/undo01.dbf','/oracle/oradata/xxx/sysaux01.dbf','/oracle/oradata/xxx/pay_ts01.dbf'CHARACTER SET ZHS16GBK;recover database until cancel using backup controlfile;...alter database open resetlogs;

◆做數據恢復操作:

create table xxx as select xxx from xxx where xxx;exp,ftp .dmp,imp

也可以如下所示，這樣會更簡單一些：

restore database;recover database using backup controlfile until cancel;alter database open resetlogs;...END!!!