ss="refentrytitle">ALTER TABLESPACE</span></a>).
        </p></dd><dt id="GUC-MAINTENANCE-IO-CONCURRENCY"><span class="term"><code class="varname">maintenance_io_concurrency</code> (<code class="type">integer</code>)
       <a id="id-1.6.7.7.7.2.3.1.3" class="indexterm"></a>
       </span> <a href="#GUC-MAINTENANCE-IO-CONCURRENCY" class="id_link">#</a></dt><dd><p>
         Similar to <code class="varname">effective_io_concurrency</code>, but used
         for maintenance work that is done on behalf of many 