title: Yii Using mongo DB and MySQL at the same time
body: <p>I'm staring to build a system for working with native languages, tags and such data in Yii Framework.</p>
  
  <p>I already choose MongoDB for storing my data as I think it feets nicelly and will get better performance with less costs (the database will have huge amounts of data). </p>
  
  <p>My question regards user authentication, payments, etc... This are sensitive bits of information and areas where I think the data is relational. </p>
  
  <p>So:
  1. Would you use two different db systems? Should I need them or I'm I complicating this?
  2. If you recommend the two db approach how would I achieve that in Yii?</p>
  
  <p>Thanks for your time!</p>
  
  <p>PS: I do not intend this question to be another endless discussion between the relational vs non-relational folks. Having said that I think that my data feets mongo but if you have something to say about that go ahead ;)</p>