a <TT
CLASS="REPLACEABLE"
><I
>cache</I
></TT
> setting greater than one you
   should only assume that the <CODE
CLASS="FUNCTION"
>nextval</CODE
> values are all
   distinct, not that they are generated purely sequentially.  Also,
   <TT
CLASS="LITERAL"
>last_value</TT
> will reflect the latest value reserved by
   any session, whether or not it has yet been returned by
   <CODE
CLASS="FUNCTION"
>nextval</CODE
>.
  </P
><P
>   Another consideration is that a <CODE
CLASS="FUNCTION"
>setval</CODE
> executed 