title: Upgrade Postgresql 8.3 database file to 8.4
body: <p>I upgraded my Ubuntu 8.04 To Ubuntu 10.04. Unfortunately, the upgrade process also updated the Postgres 8.3 install to a Postgres 8.4 install. My feeling is that although database engine binaries have been updated, the database itself was not migrated, hence it can not be loaded by the 8.4.
  Since the 8.3 data format is not compatible with 8.4 format, altering <code>postgresql.conf</code> is not enough, nor can I use <code>pg_dump</code> with my 8.4 install.</p>
  
  <p>I need a way to upgrade my previous base from 8.3 to 8.4, with no access to a 8.3 engine, only a 8.4.</p>
  
  <p>Any clue?</p>