Accidentally deleted DBF file

Hi,
I have installed Oracle 11g in my laptop for practice purpose. (Operating system is windows7).
Accidentally I've deleted one DBF file (which was created by me - file name is VIJI.DBF ). Now when I was logging to database, I'm getting error like
ORA-01033: ORACLE initialization or shutdown in progress
Process ID :0
Session ID: 0 Serial number:0After that I executed below commands from SQl*Plus
conn SYS as SYSDBA
Password : *******
SQL> SHUTDOWN IMMEDIATE;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
-- After that I've excuted STARTUP command
SQL> STARTUP;
ORACLE instance started.
Total System Global Area---
Database mounted.
ORA-01157: cannot identify/lock data file 6 - see DBWR trace file
ORA-01110: data file 6: 'C:\VIJI.DBF'Please help me to resolve this issue.
Many thanks for the help. Kindly let me know if you need any further information.
Cheers,
Suri

Mustafa KALAYCI wrote:
shutdown immediate; -- if you have trouble with that, run shutdown abort;
startup mount;
alter database datafile 6 offline;
alter database open;that will help you open your database, after that you need to restore and recover your datafile from backups.
why you had these ? because of deletion of datafile, oracle can not open database properly. to open a database oracle must be sure that everything is ok!
Edited by: Mustafa KALAYCI on Aug 10, 2012 1:54 AMHi Mustafa, Saurabh
Thank you very much for the reply.
I've executed above commands and got below error.
ORA-01145: offline immediate disallowed unless media recovery enabledI'm a developer, and I dont know how to restore the datafile. If it simple let me know the steps. Else, I'll reinstall the database again.
Cheers,
Suri

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I see dbf files dating for more than 1 year.
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