t the
            transaction. <code class="classname">DB_TXN</code> handles are provided to 
            <a class="link" href="db.html" title="Chapter 2.  The DB Handle">DB</a> methods in order
            to transactionally protect those database operations.
        </p>
      <p>
            <code class="classname">DB_TXN</code> handles are not free-threaded; transactions handles
            may be used by multiple threads, but only serially, that is, the application must
            serialize access t