Optimal Apache Settings for PHP?

Hi, I was reading Gerhard Mourani's Linux Optimization book and it advises the following Apache configuration optimizations (among other) : MaxKeepAliveRequests 0 # unlimited MaxRequestsPerChild 10000 which I intepret to mean basically "let everybody in, we'll get round to ur table eventually." While this might be good for static HTML pages which doesn't take up much CPU, I'm wondering if it's advisable for a PHP enabled site. Every PHP document called might have quite a few calculations or data churning in it. This would translate to having a longer time for each PHP document to be processed. Even worse is when you call a DB server eg mysql. When I set up my Apache server according to the recommendations in the book, whenever the mysql server locks up or dies, httpd will just keep on queueing up the incoming process while the current processes are waiting to be timed out. Which can be pretty heavy on the server resources and might even lead to it hanging. Is there anybody with any suggestions on good parameters for configuring Apache to work with PHP and a database? Would appreciate it a lot... Thanks Wong