title: Exporting 8million records from Oracle to MongoDB
body: <p>Now I have an Oracle Database with 8 millions records and I need to move them to MongoDB.
  I know how to import some data to MongoDB with JSON file using import command but I want to know that is there a better way to achieve this regarding these issues.</p>
  
  <ul>
  <li>Due to the limit of execution time, how to handle it?</li>
  <li>The database is going up every seconds so what's the plan to make sure that every records have been moved.</li>
  </ul>