 does not assume data remains in
        the disk cache between queries.  The default is 128 megabytes
        (<TT
CLASS="LITERAL"
>128MB</TT
>).
       </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="RUNTIME-CONFIG-QUERY-GEQO"
>18.7.3. Genetic Query Optimizer</A
></H2
><P
>      The genetic query optimizer (GEQO) is an algorithm that does query
      planning using heuristic searching.  This reduces planning time for
      complex queries (those joining many relations), at t