[Cooker] rpm 3.0 -> rpm 4.0

[Aurelien Jarno]

Hi all,

I have just tried to upgrade rpm to 4.0, and I have loosed my rpm database. 
So I came back to rpm.

I'd like to know how to update from rpm 3.0 to rpm 4.0 without loosing rpm 
database.

Thanks

Aurélien