Server going down

[eluser]shriyanag[/eluser]
Hi,thanks for reply...
we are not caching..and we are using phpmyvisites code for web analytics..and we added the script in all the pages..now i removed in all the pages and added only in header because header is common for all..everyday the new datas will be adding into the database...we have more than 160 tables..and i have one more doubt we are loading models in parent controllers..how we need to load model..we need to call in particular function or in parent controller?
what is the maximum code we should have?like what is the size?
we hosted the site in VPS...
some controllers got morethan 5000 lines of code..
plzz reply asap..

Thanks.