[mijoharas]

Thought I'd weigh in here, since we moved from heroku to ec2 to aurora to RDS postgres, so I can probably speak to this a little more.

* ec2 self managed is easily the cheapest, we had a solid setup, with continuous backups and a read replica, if cost is a factor, it's easily a winner. However, there is a _lot_ of knowledge that goes with it. When it comes down to it, you can pay someone else to handle that. This isn't just the setup cost, you need to factor in ongoing maintenance (the number of people at my company that could have done complicated things with the instance was probably me and another engineer, and we didn't want to be permanently on call for this) and general risk.

* EC2 did probably work out to between 1/2 to 3/4 (probably 2/3) the price of the equivalent RDS (tough to say exactly, as I'd need to factor in all the ancillary costs that are more "bundled together" in RDS)

* RDS was much cheaper than aurora for our workload. (almost 1/2 the price).

I think the main thing to remember, is that ec2 is much cheaper than RDS, but RDS is cheaper than engineers. With that, while we didn't need to do anything complicated other than the migration, the risk and possible engineering time and bus factor didn't feel worth it to stay on ec2.

[craigkerstiens]

We've had a few people migrate from Heroku and RDS over to Crunchy Bridge and see 2.5x performance improvement on warm cache and up to 5-6x performance improvement on cold cache for the exact same $ spend. I can't say easily how that would compare to raw EC2 cause it really depends on how you tune and configure. But there is definitely some opportunity to optimize vs. any stock install and setup.

The real thing about EC2 is it'll be cheaper. But when you do have a bad day, say page corruption you're gonna have more than a bad day and a bad week/month trying to untangle that. I'm not sure how helpful RDS is in those cases. I can say that Heroku historically was solid (I was there way back in the day having helped build the service). And there are some other options that can still deliver good performance, good support, at a balanced price.

[rohansahai]

Been on RDS for awhile now but have recently had some issues that are pushing us to heavily consider EC2 - especially since we've heard about considerable performance gains running on some of the bare metal EC2 options out there vs RDS.

[mijoharas]

We had equivalent performance (and we'd benchmarked both) for equivalent RDS and EC2 instances. (EDIT: to note, we didn't dig in heavily, just looked and saw it seemed the same, maybe there's something smart you can do to make EC2 a lot faster)

First thing to think about for RDS (or any postgres instance really) is to figure out what the bottlenecks are, if your cache hit ratio is slightly low, or queries are generally feeling a little sluggish but cpu and ram aren't too high, I'd recommend looking into increasing the provisioned IOPS of the machine (requires no downtime, basically you can just make the storage faster).

If your issues are ram/cpu being high you might want to consider moving to a larger instance.

It can also be worth looking into the number of temp files being created by your queries and tweak your work_mem setting (you can use log_temp_files to see if this is likely to help a bit).

Other than that, remember that every connection to the db is a separate process, so you don't want too many. It could be worth looking at RDS proxy or pg_bouncer if you think you have a lot of connections to your db.