Thank for your advices guys!
We assume that our db will do the job and will be fine-tuned.
We are just worried about server/script performance. Lets say we will have to manage 1000 requests per second.
1. We are sure that db will handle this.
2. We are sure that php won't. Apache reloads mod_php each 100 requests because of memory leaks. Don't know how is it in LSWS, which we are very impressed.
So... Anyone knows what is the performance factor for fcgi c/c++ and fcgi php?
They both uses persistent connections (which is greatly performance boot).