i issued the same following this and try to recover all file but at last it shows error "ORA-01092: ORACLE instance terminated. Disconnection forced"
here i listed wat i did
SQL> recover datafile 'D:\ORACLE\ORADATA\SONA\SYSTEM01.DBF';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 2 needs media recovery
ORA-01110: data file 2: 'D:\ORACLE\ORADATA\SONA\UNDOTBS01.DBF'

SQL> recover datafile 'D:\ORACLE\ORADATA\SONA\UNDOTBS01.DBF';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 3 needs media recovery
ORA-01110: data file 3: 'D:\ORACLE\ORADATA\SONA\CWMLITE01.DBF'


SQL> recover datafile 'D:\ORACLE\ORADATA\SONA\CWMLITE01.DBF'
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 4 needs media recovery
ORA-01110: data file 4: 'D:\ORACLE\ORADATA\SONA\DRSYS01.DBF'


SQL> recover datafile 'D:\ORACLE\ORADATA\SONA\DRSYS01.DBF'
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 5 needs media recovery
ORA-01110: data file 5: 'D:\ORACLE\ORADATA\SONA\EXAMPLE01.DBF'
SQL> recover datafile 'D:\ORACLE\ORADATA\SONA\EXAMPLE01.DBF'
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: 'D:\ORACLE\ORADATA\SRASDEV\INDX01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/indx01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 7 needs media recovery
ORA-01110: data file 7: 'D:\ORACLE\ORADATA\SRASDEV\TOOLS01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/tools01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 8 needs media recovery
ORA-01110: data file 8: 'D:\ORACLE\ORADATA\SRASDEV\USERS01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/users01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 9 needs media recovery
ORA-01110: data file 9: 'D:\ORACLE\ORADATA\SRASDEV\SAAS_UNIV_DATA01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/saas_univ_data01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 10 needs media recovery
ORA-01110: data file 10: 'D:\ORACLE\ORADATA\SRASDEV\SIS_DB_DATA01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/SIS_DB_DATA01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 11 needs media recovery
ORA-01110: data file 11: 'D:\ORACLE\ORADATA\SRASDEV\SAAS_WEBREF_DATA01.DBF'


SQL> recover datafile 'd:/oracle/oradata/srasdev/saas_WEBREF_DATA01.dbf';
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01092: ORACLE instance terminated. Disconnection forced
so wat to do now?
any suggestions plz......
plz help me to solve this issue.....