Does anybody have any experience with this:

Is antivirus software such as McAfee Antivirus going to affect performance of Oracle on Windows 2000 server?

I have a file-based email server with antivirus installed and the McShield on-access scanner is constantly using CPU time whenever a emailbox file is accessed. I wonder if it does the same thing as database file access. I am more concerned about contention for datafile access than stealing CPU cycle.