S="REPLACEABLE"
><I
>cache</I
></TT
> setting of 10,
   session A might reserve values 1..10 and return
   <CODE
CLASS="FUNCTION"
>nextval</CODE
>=1, then session B might reserve values
   11..20 and return <CODE
CLASS="FUNCTION"
>nextval</CODE
>=11 before session A
   has generated <TT
CLASS="LITERAL"
>nextval</TT
>=2.  Thus, with a
   <TT
CLASS="REPLACEABLE"
><I
>cache</I
></TT
> setting of one
   it is safe to assume that <CODE
CLASS="FUNCTION"
>nextval</CODE
> values are generated
   sequentially; with 