![]() The process that is chosen as the deadlock victim will give the following error. As a result, other processes can move forward. When deadlocks occur in SQL Server, then SQL Server chooses one of the processes (transactions) as the deadlock victim and then rolls back that process. In such cases, neither of the transactions (processes) can move forward resulting in a deadlock. ![]() At the same time, Process B needs the resource Table A which is already locked by Process A. Now to complete its execution, process A needs the resource Table B which is already locked by Process B. Process A started and it acquires a lock on table A and in the meantime, Process B started and it acquired a lock on Table B. We have two tables such as Table A and Table B in the database. when a deadlock occurs in a database.Īs shown in the above diagram, we have two processes (process means transactions) such as Process A and Process B. If you are confused, then just have a look at the following diagram which explains the above points i.e. In such cases, neither of the processes can move forward, as each process is waiting for the other process to release the lock resulting in a deadlock in SQL Server. When a deadlock occurs in SQL Server?Ī deadlock occurs in a database when two or more processes have already a resource locked, and then each process wants to acquire a lock on the resource that the other process has already locked. Before going to understand what is Deadlock in SQL Server, let’s first discuss when a deadlock occurs in SQL Server. ![]() Please read our previous article where we discussed Concurrency Problems in SQL Server with examples. In this article, I am going to discuss Deadlock in SQL Server with examples.
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