title: MongoDB - avoid "downtime" during import?
body: <p>I am using MongoLab to store 60 datasets that update a few times per month.
  I currently have an import script that drops the database and then reimports the 60 or so CSV files.</p>
  
  <pre><code>//drop -&gt; then insert each indicator
  db.dropDatabase(function(err, result){
  .... 
  db.collection("indicators").insert(group, grpCallback);
  </code></pre>
  
  <p>During import, this obviously yields X minutes with an empty/non-complete database.  </p>
  
  <p>What are some options for avoiding this "downtime" using either the single instance I have today or a more advanced MongoDB configuration?</p>