See Choose a method to add or create a knowledge base collection.
Database-only collections are used primarily by WorldShare Acquisitions and WorldShare License Manager libraries when they need to acquire collections or associate licenses with collections that do not have a defined list of titles. For example, a library might create a database-only collection for the Oxford English Dictionary website. Doing so would allow them to:
Note: Database-only collections will not set holdings in WorldCat or output MARC records.
To create a database-only collection: