n
         latency, but there also are some cases, especially with workloads
         that are bigger than <a class="xref" href="runtime-config-resource.html#GUC-SHARED-BUFFERS">shared_buffers</a>, but smaller
         than the OS's page cache, where performance might degrade.  This
         setting may have no effect on some platforms.
         If this value is specified without units, it is taken as blocks,
         that is <code class="symbol">BLCKSZ</code> bytes, typically 8kB.
         The valid range 