在许多分区被drop的情况下进行不完全恢复
来源：岁月联盟
时间：2008-01-28
假如表的很多分区被意外drop，需要利用带库上的备份集在测试机上做不完全恢复，具体日期需要达到一个特定的时间，那么我们可以参考下文。
◆首先需要用logminer查出删除语句：
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; |
◆然后在生产库上创建pfile：
create pfile='...' from spfile; |
需要从带库上恢复rman备份集至生产机上,将此备份集FTP至测试机上，连同pfile文件.
在测试机上创建与生产机上相同目录，admin ...
在测试机上创建新实例
orapwd file=... password=xxx |
然后修改pfile文件内容，改变control_files内容
◆启动新实例
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：发现单个datafile恢复不如整库恢复快！)sql 'alter database backup controlfile to trace';shutdown immediate;exit |
然后修改controlfile文件内容，去掉不用的文件名
◆不完全恢复数据库:
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; |
◆做数据恢复操作:
create table xxx as select xxx from xxx where xxx;exp,ftp .dmp,imp |
也可以如下所示，这样可以更简单一点：
restore database;recover database using backup controlfile until cancel;alter database open resetlogs;...END!!! |
