As for a book title, is "the-article' necessary?
The Databank of ~ or Databank of ~
The Dictionary of ~ *or Dictionary of ~
Generally speaking, it's up to you.
'The' gives the impression that it is the only one. This can, of course, be modified: The Physicist's Databank of ..., or The University of *** Databank of ...
Another possibility is 'A':
A Databank of ...