MySQL has similar issues to postgres vacuum. If 'checkpoint age' gets too high throughput drops by ~5x to prevent WAL wrapping. We hit this in production when u

MySQL has similar issues to postgres vacuum. If 'checkpoint age' gets too high throughput drops by ~5x to prevent WAL wrapping. We hit this in production when using 5.5. They've made a lot of improvements to flushing in recent versions, but it isn't a strict advantage. With both DBs as long as you monitor you would be fine.