cost estimation for large volume (>1M pages per day)

Hi,

We are looking to use piwik as analytics tools for important volume (100M unique visitors / year; 500M pages / year).

I wonder if piwik will be adapted for a such usage.

If someone has already expertise on such volume:
1) what is the mandatory infrastructure for such volume ?
2) how avoid database bottleneck ?
3) can we do multiple database insert/update rather than realtime single one ?

Thanks
Yi