ng"><span class="admonition-warning-text"><b>Caution:</b></span>
Calling neither <tt class="docutils literal"><span class="pre"><span class="Identifier">reset</span></span></tt> nor <tt class="docutils literal"><span class="pre"><span class="Identifier">commit</span></span></tt> on a transaction can block database access. This commonly happens when an exception is raised.</div>


</dd>
</div>
<div id="len,Database">
<dt><pre><span class="Keyword">proc</span> <a href="#len%2CDatabase"><span class="Identifier