title: Redis key design
body: <p>I'm wondering if the way we "design" keys in Redis can impact performance and scalability.
  For example, if I store content related to "users" under keys like <code>"user:&lt;user_id&gt;"</code> and content related to say, groups, under keys like <code>"group:&lt;group_id&gt;"</code>, all my keys will start with either <code>"user:"</code> or <code>"group:"</code>. </p>
  
  <p>Will this have a negative impact on the way Redis hashes keys internally?</p>