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This is probably caused by a blocking process. 3-5 times a day this is blocked by some update or other write that takes ~40 seconds. Your SELECT blocks until it can continue. If this is indeed the case, the problem can be identified using the Blocked Process Report Event. You will have to enable this event and set the threshold to ~35 seconds. See blocked ...


I ran into the same problem in a SQL Server 2012 instance (SP2 applied). I haven't found the root cause yet, but we will be looking at the AD caching mechanism, as suggested by StanleyJohns. By accident I have found a simple solution that worked for me without rebooting the server. I created a Windows Authenticated login for the old username (yes, that ...

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