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>43.7. PL/Perl Event Triggers</A
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>   PL/Perl can be used to write event trigger functions.  In an event trigger
   function, the hash reference <TT
CLASS="VARNAME"
>$_TD</TT
> contains information
   about the current trigger event.  <TT
CLASS="VARNAME"
>$_TD</TT
> is a global variable,
   which gets a separate local value for each invocation of the trigger.  The
   fields of the <TT
CLASS="VARNAME"
>$_TD</TT
> hash reference are:

   <P
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><DT
><TT
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>$_TD-&gt;{event}</TT
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>       The name of the event the trigger is fired for.
      </P
></DD
><DT
><TT
CLASS="LITERAL"
>$_TD-&gt;{tag}</TT
></DT
><DD
><P
>       The command tag for which the trigger is fired.
      </P
></DD
></DL
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  </P
><P
>   The return value of the trigger procedure is ignored.
  </P
><P
>   Here is an example of an event trigger function, illustrating some of the
   above:
</P><PRE
CLASS="PROGRAMLISTING"
>CREATE OR REPLACE FUNCTION perlsnitch() RETURNS event_trigger AS $$
  elog(NOTICE, "perlsnitch: " . $_TD-&#62;{event} . " " . $_TD-&#62;{tag} . " ");
$$ LANGUAGE plperl;

CREATE EVENT TRIGGER perl_a_snitch
    ON ddl_command_start
    EXECUTE PROCEDURE perlsnitch();</PRE
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