Some WordPress websites are hosted in a very limited environment that won’t allow the creation of more than one database. However, creating multiple databases can be useful for diverse WordPress applications (such as having a separate MySQL database for English language content and another for customized French-based content).
http://www.seochat.com/c/a/Search-Engine-Optimization-Help/WordPress-Database-Tutorial-Security-Backup-and-Efficiency-Tips/
In an SEO Monopoly a company is attempting to control multiple sites on the front page of the search results. Each of these sites have some way of highlighting the parent company, usually, through the form of posts or text ads.
