AN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> releases
         prior to 8.4, but it is now deprecated, because it does not
         support microsecond precision for the full range of
         <TT
CLASS="TYPE"
>timestamp</TT
> values. However, integer-based
         datetime storage requires a 64-bit integer type. Therefore,
         this option can be used when no such type is available, or
         for compatibility with applications written for prior
         versions of <SPAN
CLASS="PRODUCTNAME"
>PostgreS