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">
       <structfield>map_number</structfield> <type>int4</type>
      </para>
      <para>
       Number of this map, in priority order, if valid, otherwise
       <literal>NULL</literal>
      </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 map
      </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 map in <literal>file_name</literal>
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>map_name</structfield> <type>text</type>
      </para>
      <para>
       Name of the map
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>sys_name</structfield> <type>text</type>
      </para>
      <para>
       Detected user name of the client
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>pg_username</structfield> <type>text</type>
      </para>
      <para>
       Requested PostgreSQL user name
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>error</structfield> <type>text</type>
      </para>
      <para>
       If not <literal>NULL</literal>, 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-indexes">
  <title><structname>pg_indexes</structname></title>

  <indexterm zone="view-pg-indexes">
   <primary>pg_indexes</primary>
  </indexterm>

  <para>
   The view <structname>pg_indexes</structname> provides access to
   useful information about each index in the database.
  </para>

  <table>
   <title><structname>pg_indexes</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>schemaname</structfield> <type>name</type>
       (references <link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.<structfield>nspname</structfield>)