Sql deadlock parallelism tablock hint12/25/2023 ![]() ![]() Without deadlock information there really is nothing to diagnose, but Are you deadlocking on the same rows? It seems to be the order of operations taken by either the queries or the logic used in them. This really isn't going to get very far to be honest. We have been changing our Select statements to include WITH (NOLOCK) so they do not compete with the UPDATE statements they usually fall victim to. Deadlocks are application based, pure and simple. You probably didn't get this before (though they probably still happened) because the executions were forced serially and you dodged many-a-bullet because of this artificial speed bump. Though now the issue we are having is that our Deadlocks have gone through the roof. The processor usage should have also gone up as now you're allowing parallel plans to be run. Sharepoint queries are extremely terrible. It always forces serial plans, because to be honest the This is from the Setup Guide for SharePoint on SQL Server, MAXDOP = 1 is a must in their book for official support. It was set to 1 because if it isn't MS won't support your SharePoint installation. Our SQL Server runs a AccPac Account System, an Internal Intranet site and some SharePoint Content DBs. ![]() All of the deadlocksĪre with our Intranet Site and When it communicates with the AccPac DB, or the Internet Site on its own.Īny Suggestions on where I should be focusing my energy on benchmarking and tuning the server? The Deadlocks and timeouts do not seem to be related to any of the SharePoint Content DBs. Going from one or two every few days, we are Going from several a day, we are now at 1 every few days. Before doing extensive research on it and looking through the BOL, another DBA and I changed it to 0. Looking at some of the SQL Server settings, I noticed that MAXDOP was set to 1. IIS and the SQL timeouts are set to 60 and 120 seconds. We know that some of the queries are complex and take some time, though the timeouts seem to happen randomly and not always on the same pages/queries. We have been trying to track down some timeout issues with our SQL Server. ![]()
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