We are just beginning to use a third party tool to monitor our SQL Servers. One very active server seems to have a few occassions where the Free buffer goes very low (under 10)however, it seems to quickly resolve back to a couple of hundred free buffers. This occurs both during times with heavy user activity and times with little user activity but high sql agent maintenance activity. Other memory numbers and the Buffer cache hit ratio seem fine. Any ideas? Is this normal when SQL Dynamically manages memory?