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High CPU usage occurs periodically on the subscriber - SQL Server 2008 Sp4

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Hello,

I have setup a merge publication and a subscriber with push subscription mode.

On the subscriber, I notice the CPU usage is going high periodically.

It may take about 40 seconds for the CPU Usage come back to 0%. And it occurs at same time as long as theSynchronization Status display : "Uploading data changes to the Publisher" . This only occurs at subscriber, the publisher is normally.


I've go to  Reports > Top Queries by Total CPU time at the subscriber to see which queries make the CPU usage go high and below is the result:



I don't know what to do next to fix this issue. Anyone please help me. Thank you all very much.


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