David Fetter wrote:
***************
*** 173,179 ****
          Integrating autovacuum into the server allows it to be
          automatically started and stopped in sync with the database
          server, and allows autovacuum to be configured from
!         <filename>postgresql.conf</>.
         </para>
        </listitem>
       </varlistentry>
--- 173,181 ----
          Integrating autovacuum into the server allows it to be
          automatically started and stopped in sync with the database
          server, and allows autovacuum to be configured from
!         <filename>postgresql.conf</>.  Autovacuum now checks to see if
!         the database is in danger of xid wraparound and
!         <command>VACUUM</command>s the whole database if needed.
         </para>
        </listitem>
       </varlistentry>

AFAIK contrib/pg_autovacuum in 8.0 also checked for XID wraparound (or at least its documentation claims that it does), so I don't see how this is new functionality.

-Neil

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

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