I m sorry about my bad english firstly
Yes Mysql Based web sites, of course php
now for example i have a web site xxx.com and i open it on browser. When i press the F5 button till 10 seconds are enough and sites give error php error and after 10 seconds, cpu down and all server is down...
when i see the top command when this action, it shows
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7622 aykut72 20 0 76496 38m 13m R 22.0 1.3 0:05.36 httpd
therefore, a little hack tool or ip flood tools are very effective on my sites