Take the DB offline, bring it online. Of course that also kicks all users out, clears the plan cache and the data cache, so may not be desirable.
Why not save the current values to a permanent table, then later save the values again and compare the two?
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
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