Add menu item with sql?

Hello!
I’ve ran into a problem. I cant add more then 16 menu items in my custom meny. I’ve tested the site on sveral Servers and it works everywhere except on the server where the site Have to be at. SO. It seems to be a problem with the server.

To get arround this, i thought that i might be able to add the Last menu item by adding the item via phpmyadmin.

So. My question is. How do i find out what sql query WordPress sends to update the menu, when you do it in the administration?

Thanks!