title: Working with 2 databases and just one entity manager in Symfony2
body: <p>I need to keep an archive database to an application in Symfony2.
  In it I'll keep all records older than 90 days. I was thinking that I could use just one entity manager (because both databases are identical). </p>
  
  <p>First of all, I'm not sure if this is the best approach/solution.
  And, besides that, I don't know how to implement this idea (I've just found 2 entity managers for 2 databases).</p>
  
  <p>I'm sorry if this is a dumb question, but I've been looking for some solution for it for 2 days now.</p>