【赛迪网－it技术报道】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;
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◆然后在生产库上创建pfile：
create pfile='...' from spfile;
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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
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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
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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;
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◆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;
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◆做数据恢复操作:
create table xxx as select xxx from xxx where xxx;
exp,ftp .dmp,imp
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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!!!
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