now i got the following error after doing :

recover database until cancel

ORA-00279: change 513301 generated at 10/19/2001 19:50:43 needed for thread 1
ORA-00289: suggestion : E:\ORACLE\ORA81\RDBMS\ARC00172.001
ORA-00280: change 513301 for thread 1 is in sequence #172
Specify log: {=suggested | filename | AUTO | CANCEL}

i tried : auto

then it appears:

ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file1:
'E:\ORACLE\ORADATA\db\SYSTEM01.DBF'

Any suggestion?

Pfms