Narayan Newton is the lead sysadmin of Drupal.org. He gave a talk called The Future of MySQL at DrupalCon 2010 San Francisco. My notes are below.
What Just Happened?
For a long time, MySQL was a stable project to track. There was one place to get it, there was one vendor, there were no really popular patch sets, and the biggest question was what minor version to run.
It changed about a year ago, when things started getting interesting.
What led to this?
There are lots of theories, here's a few: