It isn't an Edward Snowden NSA leak that the overwhelming Drupal population is running on the thirty-year- old and time honored conventional relational database management system (namely MySQL); or, to a lesser extent, on the more progressive object-relational database management system (namely PostgreSQL).  MySQL seems to be the embraced database because the contributed modules populous on d.org were designed with MySQL as the target database. Therefore, just work better with Drupal and cause less heartache for Drupal site builders and admins. ...