he cost of producing
      plans that are sometimes inferior to those found by the normal
      exhaustive-search algorithm.
      For more information see <A
HREF="geqo.html"
>Chapter 53</A
>.
     </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="GUC-GEQO"
></A
><TT
CLASS="VARNAME"
>geqo</TT
> (<TT
CLASS="TYPE"
>boolean</TT
>)</DT
><DD
><P
>        Enables or disables genetic query optimization.
        This is on by default.  It is usually best not to turn it off in
        production; the <TT
