incur a noticeable performance penalty,
      especially when statements with identical query structure are executed
      by many concurrent connections which compete to update a small number of
      <code class="structname">pg_stat_statements</code> entries.
      The default value is <code class="literal">off</code>.
      Only superusers can change this setting.
     </p></dd><dt><span class="term">
     <code class="varname">pg_stat_statements.save</code> (<code class="type">boolean</code>)
     <a id