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/xxxARCZ
begin
sysdbms_logmnradd_logfile(/oracle/oradata/xxx/xxxARC);
end;
begin sysdbms_logmnrstart_logmnr(Options => sysdbms_logmnrDICT_FROM_ONLINE_CATALOG); end;
create table xsb_logminer_ as
select timestamp seg_nameoperation sql_redo
from V$LOGMNR_CONTENTS
where seg_owner=XXX and operation=DDL and sql_redo like ALTER TABLE XXX DROP PARTITION %;
BEGIN sysdbms_logmnrend_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_xxxora;
create spfile from pfile=/home/oracle/init_xxxora;
exit
RMAN target sys/xxx
restore controlfile from ;
startup mount
crosscheck backup;
list backup;
run
{
set newname for datafile to /oracle/oradata/xxx/systemdbf;
set newname for datafile to /oracle/oradata/xxx/undodbf;
set newname for datafile to /oracle/oradata/xxx/sysauxdbf;
set newname for datafile to /oracle/oradata/xxx/pay_tsdbf;
restore datafile ;
restore datafile ;
restore datafile ;
restore datafile ;
}
(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
MAXLOGMEMBERS
MAXDATAFILES
MAXINSTANCES
MAXLOGHISTORY
LOGFILE
GROUP (
/oracle/oradata/xxx/rdb_redoa
) SIZE M
GROUP (
/oracle/oradata/xxx/rdb_redoa
) SIZE M
DATAFILE
/oracle/oradata/xxx/systemdbf
/oracle/oradata/xxx/undodbf
/oracle/oradata/xxx/sysauxdbf
/oracle/oradata/xxx/pay_tsdbf
CHARACTER SET ZHSGBK
;
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;
expftp dmpimp
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!!!
