title: Out of memory error for mongoimport command
body: <p>When I am using <strong>mongoimport</strong> to import <strong>19.4GB</strong> data to mongodb:</p>
  
  <p>mongoimport --db hui --collection gnd --file rdf_json.old --host localhost:#####</p>
  
  <p>I got this <strong>error</strong>:</p>
  
  <blockquote>
    <p>runtime: out of memory: cannot allocate 106037248-byte block (137354018816 in use)
    fatal error: out of memory</p>
  </blockquote>
  
  <p>My system is <strong>64</strong> bit. Does anybody know what's wrong with this import?</p>