ORA-01113: file <> needs media recovery

Error:

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01113: file 14 needs media recovery
ORA-01110: data file 14: '/oradata/xx01.dbf'

Solution:

To Recover the Database:

SQL> recover database;
Media recovery complete.

To Open the Database:

SQL> alter database open;

Database altered.