Amazon RDS Pros/Cons of Multiple DBs per instance

Posted by Joe Flowers on Server Fault See other posts from Server Fault or by Joe Flowers
Published on 2012-09-05T03:22:33Z Indexed on 2012/09/05 3:39 UTC
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I run two completely independent websites. I am moving their MySQL databases to Amazon RDS.

I'm not going to do Multi A/Z deployment - let's remove that variable from this question.

I'm not sure whether to create a single RDS instance with two databases, or two Amazon RDS instances with a single database. Ignore cost for the sake of this question. I will not hit the 1 TB data limit so let's ignore that. However, it is extremely important that crashing one of the websites doesn't impact the other.

Based on this document - http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/Concepts.DBInstance.html

I'm assuming that if I write terrible code that crashes one of the databases in a given RDS instance, it could possibly take down the entire RDS instance (and thus inadvertantly affect the other database). Is that correct?

Thanks

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