o" title="Tornado">Tornado</a></li><li class="ez-toc-page-1 ez-toc-heading-level-4"><a class="ez-toc-link ez-toc-heading-9" href="#Long_Polling_Comet" title="Long Polling (Comet)">Long Polling (Comet)</a></li><li class="ez-toc-page-1 ez-toc-heading-level-4"><a class="ez-toc-link ez-toc-heading-10" href="#MySQL" title="MySQL">MySQL</a></li><li class="ez-toc-page-1 ez-toc-heading-level-4"><a class="ez-toc-link ez-toc-heading-11" href="#Memcached" title="Memcached">Memcached</a></li><li class="ez-toc-page-1 ez