What does postgres have that's equivalent or better? If I'm understanding this MySQL improvement, it persists memcache data on disk, a great thing. Does postgres already do that, or better?
I think this MySQL feature has the potential to be neat, but if one is using it in the mode where one persists or faults to disk it seems like the biggest feature will not be performance, but protocol-compatibility and ease of development and deployment.
It seems like there are a few tuning modes relayed in the documents that have various persistence trade-offs, though, so the performance angle of the protocol could come into play.
I'd like Postgres to be able to support some kind of carefully-sized multi-backend caching utility someday, but as an extension if at all possible. I think such a thing is technically not that exotic (but still a lot of work), yet does not exist AFAIK. Prepared statements would usually be fast enough as-is if one had the right backend functions (UDFS) I suspect.
