MySQL 5.5.40 was recently released (it is the latest MySQL 5.5, is GA), and is available for download here:
http://dev.mysql.com/downloads/mysql/5.5.html
This release, similar to the last 5.5 release, is mostly uneventful.
There were 0 “Functionality Added or Changed” bugs this time, and 18 bugs overall fixed.
Out of the 18 bugs, most seemed rather minor or obscure, but there are 3 I think are worth noting (all 3 are InnoDB-related, regressions, and serious if you encounter them, so best to be aware of them):
- InnoDB: An ALTER TABLE … ADD FOREIGN KEY operation could cause a serious error. (Bug #19471516, Bug #73650)
- InnoDB: With a transaction isolation level less than or equal to READ COMMITTED, gap locks …