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What is a deadlock in SQL Server transaction processing? Are they preventable, if so how?

What is a deadlock in SQL Server transaction processing? Are they preventable, if so how?

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A deadlock occurs when 2 processes are competing for exclusive access to a resource but is unable to obtain exclusive access to it, because the other process is preventing it. This results in a standoff where neither process can proceed. The only way out of a deadlock is for one of the processes to be terminated. SQL Server automatically detects when deadlocks have occurred and takes action by killing one of the processes known as the victim.

Deadlocks do not only occur on locks, from SQL Server 2012 onward , deadlocks can also happen with memory, MARS (Multiple Active Result Sets) resources, worker threads and resources related to parallel query execution.

Resolving deadlocks can be a tricky business, and is beyond the scope of this article. Look out for my next articles which explain how to read the deadlock graph which is the most useful in understanding the cause of your deadlock and will give you the insight on how to tackle a deadlock.

venereology answered 1 month ago
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