>-----Original Message-----
>From: [EMAIL PROTECTED] 
>[mailto:[EMAIL PROTECTED] On Behalf Of 
>Russell Aspinwall
>Sent: woensdag 17 oktober 2007 9:34
>To: pgsql-general@postgresql.org
>Subject: [GENERAL] newbie question
>
>Hi,
>
>[snip] For example, if you had a 
>built a database and application using version 3 and then 
>upgraded the version 7, it was possible to set the database 
>configuration to version 3 and then continue to use the same 
>database and applications without having to dump the database 
>tables and data then import them into a  version 7 database or 
>update applications.
>Does this feature exist in ProgreSQL, can a v8 access a 
>database created using v7?

No it cannot. You must perform a dump and restore.

Also note that between different architectures (and sometimes between
different compiles) the file format might also be different.
See also:
http://www.postgresql.org/docs/8.1/interactive/install-upgrading.html.

However all queries running on v7 should work on v8. The application
should not require any modifications. In practice you should, of course,
test that before putting it into production.

- Joris


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