> So if someone has a real world workload where having the ability to purposely 
> not cache user
> data would be a win, please let me know.

Multimedia streaming is an obvious one.

For databases, it depends on the application, but in general the database will 
do a better job of selecting which data to keep in memory than the file system 
can. (Of course, some low-end databases rely on the file system for this.)
 
 
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