     <span class="sect2">
                <a href="enabletxn.html#security">Security Considerations</a>
              </span>
            </dt>
          </dl>
        </div>
        <p>
        For simple DB applications, environments are optional. However, in
        order to transaction protect your database operations, you must use an
        environment.
    </p>
        <p>
        An <span class="emphasis"><em>environment</em></span>, represents an
        encapsulation of one or more databases and a