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I set up Data Collection for simple and basic monitoring of instances of SQL Server 2008 R2 (/2012) (is simple, accessible for and with very nice colors for my boss :-)

But one of instances showing negative numbers in Query Statistic History report, doesn't matter if is connected from local host or from another PC

Please to see image

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My question is: what happened (or if is a bug in SSMS)?

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How can I (and if is possible) to test correctness of the displayed values,

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How long the instance that you are monitoring is up ? –  Kin Dec 28 '13 at 3:40
    
@Kin > 1Month, but max for query history is 7days –  mKorbel Dec 28 '13 at 6:54

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