<command>INSERT</command>
   statements with an <literal>ON CONFLICT DO NOTHING</literal> clause on
   a foreign table, the remote server must be running
   <productname>PostgreSQL</productname> 9.5 or later,
   as earlier versions do not support this feature.
  </para>
 </sect2>

 <sect2 id="postgres-fdw-wait-events">
  <title>Wait Events</title>

  <para>
   <filename>postgres_fdw</filename> can report the following wait events
   under the wait event type <literal>Extension</literal>:
  </para>

  <variablelist>
   <varlistentry>
    <term><literal>PostgresFdwCleanupResult</literal></term>
    <listitem>
     <para>
      Waiting for transaction abort on remote server.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>PostgresFdwConnect</literal></term>
    <listitem>
     <para>
      Waiting to establish a connection to a remote server.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>PostgresFdwGetResult</literal></term>
    <listitem>
     <para>
      Waiting to receive the results of a query from a remote server.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </sect2>

 <sect2 id="postgres-fdw-configuration-parameters">
  <title>Configuration Parameters</title>

  <variablelist>
   <varlistentry id="guc-pgfdw-application-name" xreflabel="postgres_fdw.application_name">
    <term>
     <varname>postgres_fdw.application_name</varname> (<type>string</type>)
     <indexterm>
      <primary><varname>postgres_fdw.application_name</varname> configuration parameter</primary>
     </indexterm>
    </term>
    <listitem>
     <para>
      Specifies a value for <xref linkend="guc-application-name"/>
      configuration parameter used when <filename>postgres_fdw</filename>
      establishes a connection to a foreign server.  This overrides
      <varname>application_name</varname> option of the server object.
      Note that change of this parameter doesn't affect any existing
      connections until they are re-established.
     </para>
     <para>
      <varname>postgres_fdw.application_name</varname> can be any string
      of any length and contain even non-ASCII characters.  However when
      it's passed to and used as <varname>application_name</varname>
      in a foreign server, note that it will be truncated to less than
      <symbol>NAMEDATALEN</symbol> characters.
      Anything other than printable ASCII characters are replaced with <link
      linkend="sql-syntax-strings-escape">C-style hexadecimal escapes</link>.
      See <xref linkend="guc-application-name"/> for details.
     </para>

     <para>
      <literal>%</literal> characters begin <quote>escape sequences</quote>
      that are replaced with status information as outlined below.
      Unrecognized escapes are ignored. Other characters are copied straight
      to the application name. Note that it's not allowed to specify a
      plus/minus sign or a numeric literal after the <literal>%</literal>
      and before the option, for alignment and padding.
     </para>

     <informaltable>
      <tgroup cols="2">
       <thead>
        <row>
         <entry>Escape</entry>
         <entry>Effect</entry>
        </row>
       </thead>
       <tbody>
        <row>
         <entry><literal>%a</literal></entry>
         <entry>Application name on local server</entry>
        </row>
        <row>
         <entry><literal>%c</literal></entry>
         <entry>
          Session ID on local server
          (see <xref linkend="guc-log-line-prefix"/> for details)
         </entry>