e automatically if <a class="xref" href="runtime-config-statistics.html#GUC-COMPUTE-QUERY-ID">compute_query_id</a>
  is set to <code class="literal">auto</code> or <code class="literal">on</code>, or any third-party
  module that calculates query identifiers is loaded.
 </p><p>
   When <code class="filename">pg_stat_statements</code> is active, it tracks
   statistics across all databases of the server.  To access and manipulate
   these statistics, the module provides views
   <code class="structname">pg_s