title: What's the risk in setting the Postgres connection pool size too high?
body: <p>I am running a tonne of jobs in parallel using Sidekiq and a lot of them are failing to connect to the database because I've only got a connection pool size of 5. </p>
  
  <p>I'd like to just bump that up to 15 (at least on localhost) but was wondering what the possible negative consequences of that might be. </p>
  
  <p>Setup is Ruby on Rails, default poolsize is 5.</p>