title: Which NoSQL DB is best fitted for OLTP financial systems?
body: <p>We're designing an OLTP financial system. it should be able to support 10.000 transactions per second and have reporting features.</p>
  
  <p>So we have come to the idea of using:</p>
  
  <ul>
  <li>a NoSQL DB as our main storage</li>
  <li>a MySQL DB (Percona server actually) making some ETLs from the NoSQL DB for store reporting data</li>
  </ul>
  
  <p>We're considering MongoDB and Riak for the NoSQL job. we have read that Riak scales more smoothly than MongoDB. And we would like to listen your opinion.</p>
  
  <ul>
  <li><strong>Which NoSQL DB would you use for a
  OLTP financial system?</strong></li>
  <li><strong>How has been
  your experience scaling MongoDB/Riak?</strong></li>
  </ul>