/P
></DD
><DT
><A
NAME="GUC-CURSOR-TUPLE-FRACTION"
></A
><TT
CLASS="VARNAME"
>cursor_tuple_fraction</TT
> (<TT
CLASS="TYPE"
>floating point</TT
>)</DT
><DD
><P
>        Sets the planner's estimate of the fraction of a cursor's rows that
        will be retrieved.  The default is 0.1.  Smaller values of this
        setting bias the planner towards using <SPAN
CLASS="QUOTE"
>"fast start"</SPAN
> plans
        for cursors, which will retrieve the first few rows quickly while
        perhaps taking a long time