[noaheverett]

I haven’t used PG in production so I’m probably biased, naive or both, so I know this isn’t a direct response to your question, but…

MySQL has been great for every project I’ve used it in and haven’t had any issues. Largest app we used it in was Twitpic which handled high query traffic and along with the built-in replication, it was easy to use. We had replication lag on spinning disks (this was 2009) but switching to SSDs fixed it. Backups with xtrabackup from Percona is a key piece though for taking incremental or full DB backups.

I think back-in-the-day, PG didn’t have replication built-in and that always kept me using MySQL, but I’ve honestly never understood the bad rap MySQL got in years previous as I’ve never run into any of the described issues and it has been rock solid for me in apps of all sizes.