Restoring only the tablespace from the database

Question

How do we restore only a 'tablespace' from a Terabyte database without restoring the entire database.
ie... if a particular tablespace has been dropped from the database and we have the backup available for the database.
So, how do we go about it for restoring only that tablespace.
Version:10.2.0.4
OS : solaris 10
Edited by: user13364377 on Sep 29, 2010 3:49 AM
Edited by: user13364377 on Sep 29, 2010 3:51 AM

Answer 1

If you have a RMAN backup before dropping the tablespace then we can restore the tablespace by below method
It is a tablespace point in time recovery ,here we need to create a auxillary DB.
Recover a table/tablespace from Rman backup on same server:
===============================================
Here we have to create the auxillary database.
1.u should have valid backup of the database before dropping the tablespace.
2.create the password file of target database.
orapwd file=$ORACLE_HOME\dbs\PWDORCL2.ORA password=oracle
3.Take backup of the control file to trace for creating the new control file for new
auxillary database/
SQL> alter database backup controlfile to trace;
sample control file:
STARTUP NOMOUNT
CREATE CONTROLFILE SET DATABASE "aux1" RESETLOGS FORCE LOGGING ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 454
LOGFILE
GROUP 1 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\aux1\REDO01.LOG' SIZE 10M,//make sure here to change the location of of redo
GROUP 2 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\aux1\REDO02.LOG' SIZE 10M, logs to new location or change the location name before
GROUP 3 'D:\ORACLE\PRODUCT\10.1.0\ORADATA\aux1\REDO03.LOG' SIZE 10M //starating the database at the end.
-- STANDBY LOGFILE
DATAFILE
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\prafulla\SYSTEM01.DBF',
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\prafulla\UNDOTBS01.DBF',
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\prafulla\SYSAUX01.DBF',
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\prafulla\USERS01.DBF',
'D:\ORACLE\PRODUCT\10.1.0\ORADATA\prafulla\USERS02.DBF'
CHARACTER SET WE8MSWIN1252
4.create the password file of auxillary database.
orapwd file=$ORACLE_HOME\dbs\PWDORCL2.ORA password=oracle
5.create the control file
sqlplus "/as sysdba"
SQL>@create.sql
6 catalog all the backuppiece to the newly created database;
catalog backuppiece 'D:\oracle\product\10.1.0\LOG_707656915_50P1';
7.We have to restore system,sysaux,undo and the tablespace which was dropped
run
set newname for datafile 1 to 'D:\oracle\product\10.1.0\oradata\aux1\system01.dbf';
set newname for datafile 2 to 'D:\oracle\product\10.1.0\oradata\aux1\undotbs01.dbf';
set newname for datafile 5 to 'D:\oracle\product\10.1.0\oradata\aux1\users02.dbf';
set newname for datafile 3 to 'D:\oracle\product\10.1.0\oradata\aux1\sysaux01.dbf';
set newname for datafile 4 to 'D:\oracle\product\10.1.0\oradata\aux1\users01.dbf';
restore tablespace SYSTEM;
restore tablespace UNDOTBS1;
restore tablespace users;
restore tablespace sysaux;
switch datafile all;
8.Take the other tablespace offline
sqlplus>alter tablespace tablespace_name offline drop;
9.recover the database prior to the time when tha table/tablespace was dropped.
RMAN> run{
2> set until time "to_date('07-01-2010 14:00:00','dd-mm-yyyy hh24:mi:ss')";
3> recover database;
4> }
10.open the database in resetlog mode.
take a transpotable tablespace backup of that tablespace and import it on the database where you dropped it.