ons.
   </p></div><p>
   The system view
   <a class="link" href="view-pg-hba-file-rules.html" title="54.9. pg_hba_file_rules"><code class="structname">pg_hba_file_rules</code></a>
   can be helpful for pre-testing changes to the <code class="filename">pg_hba.conf</code>
   file, or for diagnosing problems if loading of the file did not have the
   desired effects.  Rows in the view with
   non-null <code class="structfield">error</code> fields indicate problems in the
   corresponding lines of the file.
 