I am having trouble debugging why my CPU utilization occasionally reaches 100%!

The query I see which is taking time is

        SELECT TOP 1
        INNER JOIN
            [xdb_refdata].[Definitions].[ID] = [xdb_refdata].[DefinitionMonikers].[ID]
            [xdb_refdata].[DefinitionMonikers].[MonikerHash] = @hash AND
            [xdb_refdata].[DefinitionMonikers].[Moniker] = @Moniker AND
            [xdb_refdata].[Definitions].[TypeID] = @TypeID

Can someone tell me if the above query is the one causing the issue or if it only the victim?

Also, how can I identify where the issue lies?

If I recycle the CM and XDB services the performance is back to normal.

  • 2
    Have you applied this patch? kb.sitecore.net/articles/595419
    – Chris Auer
    Commented Sep 21, 2020 at 12:59
  • Thanks Chris !! That seems to have fixed it ! Not having DB issues anymore Commented Sep 23, 2020 at 21:01
  • 1
    @ChrisAuer I don't want to take your points, but your answer is the correct answer and should be converted to an answer, not a comment so you can get all of those juicy points. Commented May 10, 2022 at 14:29
  • Thanks @PeteNavarra!
    – Chris Auer
    Commented May 10, 2022 at 18:47

1 Answer 1


You will need to apply this patch. Sitecore optimized SQL to prevent this issue.


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