![]() It then demonstrates a deadlock incident as detected in SQL Monitor and shows how we can find the cause quickly using the Extended Events deadlock graph provided in the alert details, along with supporting diagnostic data on resource usage and the queries and processes executing around the time of the alert. ![]() This article will discuss why deadlocks occur, why they require immediate investigation by the DBA, and the diagnostic data required to troubleshoot them. Also, while the protagonist processes are deadlocked, other processes may also be blocked from accessing the affected tables. Technically, a deadlock can be viewed as a circular locking chain, because every process (SPID) in the blocking chain will be waiting for one or more other processes in that same blocking chain, such that none can complete.Īs soon as SQL Server detects a deadlock, it will act to resolve it by killing one of the deadlocked processes and rolling back whatever transaction it was running potentially an important business transaction, which would need to check the error code for a deadlock and respond accordingly. Deadlocks can occur when two or more sessions inside of the database engine are waiting for access to locked resources held by each other. ![]()
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