<primary>SIGHUP</primary>

</indexterm>

The configuration file is reread whenever the main server process

receives a

<systemitem>SIGHUP</> signal (which is most easily sent by means

of <literal>pg_ctl reload</>). The main server process

receives a <systemitem>SIGHUP</> signal; this is most easily done by

running <literal>pg_ctl reload</> from the command-line or by calling

the SQL function <function>pg_reload_conf()</function>). The main

server process

also propagates this signal to all currently running server

processes so that existing sessions also get the new

value. Alternatively, you can send the signal to a single server