Deadlocks
Deadlocks are a common occurrence in database management systems (DMBSs). In simple terms, deadlocks occur when a process (for example, SPID 10) has a lock on a resource that another process (for example, SPID 20) wants. In addition, the second process (SPID 20) wants the resource that the first process has locked. This cyclic dependency causes the DBMS to kill one of the processes to resolve the deadlock situation.
Resolving deadlocks and identifying the deadlock participants can be difficult. In SQL Server 2014 and past versions, trace flag 1204 can be set to capture the processes involved in the deadlock. This can be set by execution dbcc traceon (1204, 3605, -1) from a Query Window. The output is text-based but provides valuable ...
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