Advanced searching capabilities
Over the years, we have come into contact with many sites that have great content, but are virtually unusable because their search features don't allow users to find content quickly or accurately. Frequently, the search mechanisms are slow because they must search through hundreds or thousands of static HTML files. Or they are inaccurate because they don't allow users to weigh certain pieces of information more heavily than others. For instance, someone may want to find an articles written by a particular author, not necessarily all the articles that contain that author's name.
Databases are built for searching. One of the primary benefits of a database driven approach to web development is advanced searching. It is significantly faster to search through a thousand database records than a thousand HTML pages. Additionally, since content is broken up into logical data fields within the database, users can search for very specific content. Advanced queries such as one that would locate, say, all of the articles in a database that have an author named "John," a title containing the words "buy" and "sell," and were published in 1997, are fast and manageable with a database approach. These types of queries would be virtually impossible to facilitate with a static site.