title: Persistent DB Connections - Yea or Nay?
body: <p>I'm using PHP's PDO layer for data access in a project, and I've been reading up on it and seeing that it has good innate support for persistent DB connections. I'm wondering when/if I should use them. Would I see performance benefits in a CRUD-heavy app? Are there downsides to consider, perhaps related to security?</p>
  
  <p>If it matters to you, I'm using MySQL 5.x.</p>