Python - what is the fastest database ?

[martijn at gamecreators.nl]

H!,

I'm testing things with Python with databases.
But I have one big question.

What is the 'fastest' database for the internet in combination with
Python ?

- with +/- 15 GB data.
- fast internet SELECT query's.

Python use bsddb but could he handle 15 GB fast ?

A other question is:
How is it possible that google (super big database) is super fast?
What type database do they use / software ?

Thanks Very Much,
GC-Martijn