Reaction to the new release has been positive in the community from the likes of Jeremy Zawodny, Don MacAaskill and others. Zawodny provides more detail on his blog:
It seems that in the MySQL 5.5.4 release, several performance bottlenecks that really affected scalability beyond 4 cores have been either eliminated or seriously mitigated. Some of the changes were in MySQL itself, while others are InnoDB specific...
The benchmarks presented that compared MySQL 5.5.4 with 5.1 show substantial improvements in a variety of workloads. And given how many shops are still running MySQL 5.0.xx in production (including us), that means there really is A LOT to look forward too–especially on newer hardware.
I, for one, cannot wait to see what this stuff does for us.Thanks to the MySQL and InnoDB teams for their continued hard work and dedication to making MySQL faster as hardware evolves.
For those who have been skeptical, these results should go a long way towards demonstrating Oracle's commitment to ongoing investment and improvement of MySQL. Who knows, maybe this will help eliminate some of the rhetoric and FUD from the splinter groups in the MySQL community. And of course, Oracle will need to continue to ramp up investment in other areas of MySQL to make good on their promises. But they're off to a better start than anyone could have expected.
I've included some video excerpts from keynote presentations by Oracle VP Edward Screven and from Open Source maven Tim O'Reilly below.