[Crossposted to wikitech-l and mediawiki-l]
MediaWiki supports MySQL 5.0.3 (which was released back in 2005-03-23), and this is
somewhat of a blocker to MediaWiki development, and is also meaning we're missing out
on taking for granted that various features will be there for use. Or having to do
conditional support, with more potential drawbacks.
I started a discussion  as to bumping the MySQL version, and it seems that selecting
the 5.5 branch of MySQL (specifically, 5.5.8, released 2010-12-03 ) is gathering
This should hopefully be less of a controversial "bump" than the PHP 5.5 bump
was, as hosting providers seem to keep more up to date with MySQL versions. From data
gathered from wikiapiary, 90% of wikis running PHP 5.5 (ie new enough to run the latest
and greatest MediaWiki release) are running MySQL 5.5 or newer.
This email serves as the initial announcement of taking this forward, and feedback is
requested on  before this is taken forward to an RfC meeting in the near future