<para>

To cancel a running query, send the <literal>SIGINT</literal> signal

to the process running that command.

to the process running that command. To terminate a backend process

cleanly, send <literal>SIGTERM</literal> to that process. See

also <function>pg_cancel_backend</> and <function>pg_terminate_backend</>

in <xref linkend="functions-admin-signal"> for the SQL-callable equivalents

of these two actions.

</para>

<para>

The <command>postgres</command> server uses <literal>SIGTERM</literal>

to tell subordinate server processes toquit normally and

<literal>SIGQUIT</literal> to terminate without the normalcleanup.

These signals <emphasis>should not</emphasis> be used by users. It

The <command>postgres</command> server uses <literal>SIGQUIT</literal>

to tell subordinate server processes toterminate without normal

cleanup.

This signal <emphasis>should not</emphasis> be used by users. It

is also unwise to send <literal>SIGKILL</literal> to a server

process &mdash; the main <command>postgres</command> process will

interpret this as a crash and will force all the sibling processes