Is it important to delete unused columns?
<p>My app includes two models that each have one column that the app is no longer using. I believe that I understand how to migrate them out of the database. And I don't think that it will take much work to migrate them out. But before I started working on that, I got curious. How much effect does each column have on the performance of the app? Are there other possible side-effects to leaving it there? I couldn't find these questions answered elsewhere.</p>

<p>Thanks for your thoughts,</p>

<p>Jeff</p>