title: Delete database from mongodb with replica set
body: <p>I have a MongoDB running with 3 member replica set. All the members are up &amp; running.</p>
  
  <p>I have one database with 4-5 collections and I want to delete that database. </p>
  
  <p>What is the best way to do it. Can I just use db.dropDatabase() on primary?
  Do I need to stop secondary before I drop the database? After I drop the database will secondary members sync automatically to primary? What about the memory, will it get free after I delete the database?</p>