I have a server running SQL Server 2000 Enterprise Edition with a large database (350GB). The server has 4GB of RAM. I monitor this server with a 3rd party performance monitoring tool. Very often I notice that Windows is paging and there is still free memory (about 1.6GB). I thought that Windows would not start paging until it ran out of Physical Memory, but yet it does so quite consistently when there is still plenty of memory left on the server. Can anyone give me reasons why this would be happening?