role="column_definition">
       <structfield>pid</structfield> <type>integer</type>
      </para>
      <para>
       Process ID of a backend
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>gss_authenticated</structfield> <type>boolean</type>
      </para>
      <para>
       True if GSSAPI authentication was used for this connection
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>principal</structfield> <type>text</type>
      </para>
      <para>
       Principal used to authenticate this connection, or NULL
       if GSSAPI was not used to authenticate this connection.  This
       field is truncated if the principal is longer than
       <symbol>NAMEDATALEN</symbol> (64 characters in a standard build).
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>encrypted</structfield> <type>boolean</type>
      </para>
      <para>
       True if GSSAPI encryption is in use on this connection
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>credentials_delegated</structfield> <type>boolean</type>
      </para>
      <para>
       True if GSSAPI credentials were delegated on this connection.
      </para></entry>
     </row>
    </tbody>
   </tgroup>
  </table>

 </sect2>

 <sect2 id="monitoring-pg-stat-archiver-view">
  <title><structname>pg_stat_archiver</structname></title>

  <indexterm>
   <primary>pg_stat_archiver</primary>
  </indexterm>

  <para>
   The <structname>pg_stat_archiver</structname> view will always have a
   single row, containing data about the archiver process of the cluster.
  </para>

  <table id="pg-stat-archiver-view" xreflabel="pg_stat_archiver">
   <title><structname>pg_stat_archiver</structname> View</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>archived_count</structfield> <type>bigint</type>
      </para>
      <para>
       Number of WAL files that have been successfully archived
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>last_archived_wal</structfield> <type>text</type>
      </para>
      <para>
       Name of the WAL file most recently successfully archived
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>last_archived_time</structfield> <type>timestamp with time zone</type>
      </para>
      <para>
       Time of the most recent successful archive operation
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>failed_count</structfield> <type>bigint</type>
      </para>
      <para>
       Number of failed attempts for archiving WAL files
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>last_failed_wal</structfield> <type>text</type>
      </para>
      <para>
       Name of the WAL file of the most recent failed archival operation
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>last_failed_time</structfield> <type>timestamp with time zone</type>
      </para>
      <para>
       Time of the most recent failed archival operation
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para