Data processing is the essential function of computation. Thus the parameters of the database are essential to artists dealing with computers.
The word database often conflates three layers of operations: the user interface, the application logic (software controlling the application or "business rules"), and data-management software, which acts at the level of the data, the actual "database", itself.
These layers are not necessarily even physically situated on the same computer or in the same location, but may be distributed.
Websites cover large distribute systems, such as Amazon, may nonetheless maintain identity at the level of the user interface.
Net Art for the most part did not take this actual network into account; it is instead usually more accurately "computer art". Likewise, very little computer art acknowledges the deep structure of the computer's fundamental system, the database.