Well ill tell you where all is came from....
I am currently using SQL*Probe (great tool btw)... and they have a graph showing total user memory at a point in time. For the life of me I cant work out how they are getting it and exactly what impact it has on memory usage...i know ram is cheap etc etc.. but in massive web-based apps, I would like with some sort of confidence to better predict (esp historically).. the usage (high usage may even mean crap code!).
Anyhow, ive asked them how they came up with the figure and will update the list from there.. 🙂
Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"