datafiles,”Data files are the largest file types in an Oracle database. They store all the actual data you put into your database
as well as the data Oracle requires to manage the database. Data files are a physical structure: They exist whether the database is open or closed.Data files are also binary in nature. You can’t read them yourself without starting an instance and executing queries. The data is stored in an organized format broken up into Oracle blocks.Most of the time Oracle data files have an extension of .DBF (short for database file?). But the fact of the matter is that file extensions in Oracle don’t matter. You could name it .XYZ and it will function just fine.”