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>,
       or <literal>samenet</literal>, or null for local connections
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>netmask</structfield> <type>text</type>
      </para>
      <para>
       IP address mask, or null if not applicable
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>auth_method</structfield> <type>text</type>
      </para>
      <para>
       Authentication method
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>options</structfield> <type>text[]</type>
      </para>
      <para>
       Options specified for authentication method, if any
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>error</structfield> <type>text</type>
      </para>
      <para>
       If not null, an error message indicating why this
       line could not be processed
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

  <para>
   Usually, a row reflecting an incorrect entry will have values for only
   the <structfield>line_number</structfield> and <structfield>error</structfield> fields.
  </para>

  <para>
   See <xref linkend="client-authentication"/> for more information about
   client authentication configuration.
  </para>
 </sect1>

 <sect1 id="view-pg-ident-file-mappings">
  <title><structname>pg_ident_file_mappings</structname></title>

  <indexterm zone="view-pg-ident-file-mappings">
   <primary>pg_ident_file_mappings</primary>
  </indexterm>

  <para>
   The view <structname>pg_ident_file_mappings</structname> provides a summary
   of the contents of the client user name mapping configuration file,
   <link linkend="auth-username-maps"><filename>pg_ident.conf</filename></link>.
   A row appears in this view for each non-empty, non-comment line in the file,
   with annotations indicating whether the map 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_ident_file_mappings</structname> view can be
   read only by superusers.
  </para>

  <table>
   <title><structname>pg_ident_file_mappings</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">