Hi Mauro,

> I have a silly question.
>
> Is there a guide (pdf) to update a 2.1 database to 2.5 or this step is not necessary?

Best way is to do a backup with Firebird 2.1 and a restore under 2.5.
This will upgrade the ODS to 11.2, which allows you to take full
advantage of everything new and spicy in V2.5.

Also checkout the "Compatibility Issues" section in the V2.5 release notes.



--
Best Regards,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2
Upscene Productions
http://www.upscene.com
My blog:
http://blog.upscene.com/thomas/