iv>
            <div>
              <h3 class="title"><a id="idp50449856"></a>4.6.21 Patches:</h3>
            </div>
          </div>
        </div>
        <div class="orderedlist">
          <ol type="1">
            <li>Fix a bug where mutex contention in database environments configured
for hybrid mutex support could result in performance degradation.
[#15646]</li>
            <li>Fix a bug where closing a database handle after aborting a
transaction which included a failed open of that database handle