在测试机上用Oracle备份集做不完全恢复

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!!!