o explicitly use a transaction when you open your
             database. An example of this is given in the next section.
             </span>
        </p>
          </li>
        </ul>
      </div>
      <div class="sect1" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h2 class="title" style="clear: both"><a id="environments"></a>Environments</h2>
            </div>
          </div>
        </div>
        <div class="toc">
          <dl>
          