巧用Oracle备份集在测试机上做不完全恢复

dn001 2009-05-26 11:13:04

如果表的许多分区被意外drop，需要利用带库上的备份集在测试机上做不完全恢复，而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中的解决方法。

◆首先需要用logminer查出删除语句：

uncompress /oracle/oradata/xxx/xxx.ARC.Z 
...

begin
sys.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=xxx
sqlplus / as sysdba
startup nomount pfile='/home/oracle/init_xxx.ora';
create spfile from pfile='/home/oracle/init_xxx.ora';

exit

RMAN target sys/xxx
restore 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 sysdba
startup nomount;

◆重建控制文件

CREATE CONTROLFILE REUSE DATABASE "XXX" RESETLOGS ARCHIVELOG
MAXLOGFILES 40
MAXLOGMEMBERS 3
MAXDATAFILES 400
MAXINSTANCES 2
MAXLOGHISTORY 454
LOGFILE
GROUP 1 (
'/oracle/oradata/xxx/rdb_redo01a'
) SIZE 10M,
GROUP 2 (
'/oracle/oradata/xxx/rdb_redo02a'
) SIZE 10M
DATAFILE 
'/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，这样会更简单一些：

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

END!!!