
><B
>Note: </B
>     Unfortunately, there is no well-defined method for determining ideal
     values for the cost variables.  They are best treated as averages over
     the entire mix of queries that a particular installation will receive.  This
     means that changing them on the basis of just a few experiments is very
     risky.
    </P
></BLOCKQUOTE
></DIV
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><A
NAME="GUC-SEQ-PAGE-COST"
></A
><TT
CLASS="VARNAME"
>seq_page_cost</TT
> (<TT
CLASS="TYPE"
>floa