If you have a production SQL Server that has low memory, where do you start when trying to find out the root cause? I.e. 4GB of ram but only a few hundred MB left available during peak times. Do you have a specific checklist of common issues/or perhaps even common misconfigurations you would look for to see if you can track down the root cause? These are typically for dedicated SQL Servers not running any other apps but a couple are dual purpose servers, i.e. also an application server.