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I show this little-known feature in just about every perf tuning class I give, and it’s often a surprise to most of the folks there. It’s not earth-shattering or anything, but I do find it helpful.
In SQL Server Management Studio 2008, start the new Activity Monitor. Open one of the “Bands”, such as “Processes”. Move your mouse cursor over one of the header titles and leave it there. If that column is getting information from a particular Dynamic Management View (DMV), we’ll tell you where we are getting it from.
Just thought I would share that.