Upgrade from 8.4 to 9.0 version help

Hello, i read 9.0 release announcements... in release notes i could read some difficult for upgade from 8.4 version....

Some notes say that "=>" are deprecated and other differences... i read many steps for upgrade as use Pg_upgrade or change manually many parameters...stop server, copy data ecc.ecc...

The installer cannot do alone the upgrade ?

Someone could explain me the step for a secure upgrade ??

Thanks

For upgrade of PG8.4 to PG9.0, you can use pg_upgrade binary.

ehm......could you write me an example please ?? i'm not practice in this manual operation....

Here is a document of pg_upgrade, which has example:
http://www.postgresql.org/docs/9.0/interactive/pgupgrade.html

This message was edited 1 time. Last update was at 26 Sep 2010 11:12:20

i don't understand if i need to manual upgrade....

i could read "If you are using a version-specific installation directory, e.g. /opt/PostgreSQL/8.4, you do not need to move the old cluster. The one-click installers all use version-specific installation directories."

I use the windows .exe installation with installer, i have the 8.4.x version installed in c:\programmi\postgresql\8.4 directory... need i to upgrade manually ???