System tablesspace recovery

Question

Hi im a new user to oracle.
aspire to learn oracle in depth.
i have nothing much datas in my database.
in order to be clear with system tablespace recovery, i have corrupted my system tablespace.(by deleting some contents from it by opening it in notepad).
before that i have made a hot backup of my system tablespace.
i have tried to recovery using hotbackup as follows.
startup mountafter issuing this, my instance has been started and also, database has been mounted.
if i issue > alter tablespace system offline;
im recieving
alter tablespace system offline
ERROR at line 1:
ORA-01109: database not open
so i have issued > alter database open;
i have received the following one
alter database open
ERROR at line 1:
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: 'F:\ORACLE\ORADATA\DATA1\SYSTEM01.DBF'
i am suggested to replace the copied system tablespace in my operating system level as a solution for this.
is it the only solution to recover my system tablespace?
pl help me.

Answer 1

i am having hot back up copy of my system tablespace in in my F:\backup
should i copy and paste in my c:\oracle\oradata\data1(my dbname)\system.dbfYes, copy and paste the system.dbf backup file.
(I understand that this is a TEST database !).
Note : To be safe and be able to redo restore and recovery, you can take another full backup of your oradata\data1(mydbname) folder to another location. That allows you to rehearse and repeate the RESTORE and RECOVER steps.
Hemant K Chitale
Edited by: Hemant K Chitale on Jan 11, 2010 6:41 PM