Sql profiler deadlock1/15/2024 ![]() ![]() If you are on SQL Server 2008 and higher, you can also use Extended Events to troubleshoot deadlock situations. SQL Server Profiler provides you the Deadlock Graph event, which occurs as soon as a deadlock was detected. You can troubleshoot a deadlock in multiple ways. Of course you should keep track of reoccuring deadlocks, so that you do not retry your transaction over and over again. Resubmit the query, which was rolled back by SQL ServerĪfter the resubmission of the query, the query should continue without any problems, because the other blocking query will have already finished its transaction.Pause the application briefly to give the other query time to complete its transaction and release its acquired locks.Check for error number 1205, when an exception is thrown.A smart developer must do the following steps to recover from a deadlock: The “nice” thing about deadlocks is that you can fully recover from that error situation without any user interaction. The query which gets rolled back receives the error number 1205. In the worst case, a deadlock should therefore not last longer than 5 seconds. ![]() ![]() This background process runs every 5 seconds and checks the current locking situation for deadlocks. SQL Server implements the deadlock detection in a background process called the Deadlock Monitor. In the context of SQL Server, the cheapest transaction is the transaction that has written the fewer bytes to the transaction log. To resolve a deadlock, SQL Server has to rollback the cheapest of the 2 transactions. The nice thing about deadlocks is that SQL Server automatically detects and resolves them. And finally I will show you some specific deadlock types in SQL Server, and how you can avoid and resolve them. In the first step I want to give you an overview how SQL Server handles deadlocks. In todays blog posting I want to talk about how to handle Deadlocks in SQL Server. A deadlock occurs when 2 queries are waiting for each other, and no query can continue its work anymore. ![]()
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