Originally posted by mike2000
by any mean I just tried this out and here what I get:

I open the database while the datafiles being copied and below is what I got:

SQL> startup pfile=c:\oracle\admin\mytest\pfile\initmytest.ora
ORACLE instance started.

Total System Global Area 58906652 bytes
Fixed Size 75804 bytes
Variable Size 32538624 bytes
Database Buffers 26214400 bytes
Redo Buffers 77824 bytes
Database mounted.
ORA-01113: file 4 needs media recovery
ORA-01110: data file 4: 'C:\ORADATA\MYTEST\DATA_TS_01.DBF'


Exactly it had happened to me last weekend. I just recover the datafile which needs media recovery. And it works fine.

Hope this helps.