Hardware and performance

Great News guys, i've cleaned up the mdl_log still the server eats too much memory, i'm looking into a lot's of sites and forums so i can discover what is going on and still our database server is huge... we clean about 4GB of log, yet the problem persist not so heavy but it's there i don't know if the problem are the variables but i'll find what is going on :D

and always a good help is very welcome