<type>oid</type>
       (references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       ID of this group
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>grolist</structfield> <type>oid[]</type>
       (references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
      </para>
      <para>
       An array containing the IDs of the roles in this group
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

 </sect1>

 <sect1 id="view-pg-hba-file-rules">
  <title><structname>pg_hba_file_rules</structname></title>

  <indexterm zone="view-pg-hba-file-rules">
   <primary>pg_hba_file_rules</primary>
  </indexterm>

  <para>
   The view <structname>pg_hba_file_rules</structname> provides a summary of
   the contents of the client authentication configuration file,
   <link linkend="auth-pg-hba-conf"><filename>pg_hba.conf</filename></link>.
   A row appears in this view for each
   non-empty, non-comment line in the file, with annotations indicating
   whether the rule could be applied successfully.
  </para>

  <para>
   This view can be helpful for checking whether planned changes in the
   authentication configuration file will work, or for diagnosing a previous
   failure.  Note that this view reports on the <emphasis>current</emphasis> contents
   of the file, not on what was last loaded by the server.
  </para>

  <para>
   By default, the <structname>pg_hba_file_rules</structname> view can be read
   only by superusers.
  </para>

  <table>
   <title><structname>pg_hba_file_rules</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>rule_number</structfield> <type>int4</type>
      </para>
      <para>
       Number of this rule, if valid, otherwise <literal>NULL</literal>.
       This indicates the order in which each rule is considered
       until a match is found during authentication.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>file_name</structfield> <type>text</type>
      </para>
      <para>
       Name of the file containing this rule
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>line_number</structfield> <type>int4</type>
      </para>
      <para>
       Line number of this rule in <literal>file_name</literal>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>type</structfield> <type>text</type>
      </para>
      <para>
       Type of connection
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>database</structfield> <type>text[]</type>
      </para>
      <para>
       List of database name(s) to which this rule applies
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>user_name</structfield> <type>text[]</type>
      </para>
      <para>
       List of user and group name(s) to which this rule applies
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>address</structfield> <type>text</type>
      </para>
      <para>
       Host name or IP address, or one
       of <literal>all</literal>, <literal>samehost</literal>,