>>Take a look at the thread with the same problem in MSDN forum
>>
>>http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/e14518c0-0d93-4fc2-ac16-146b3de93d4b
>
>Thanks, so basically, UPDATE STATISTICS might be used in such circumstances to refresh some SQL Server metrix data. And, that might resole the issue. Is that correct?

That's a simple thing to try.