If you’re running SQL 2005, you should be using 1222 instead of 1204 unless you have deep-seated masochistic tendencies. This trace flag is a new trace flag in SQL 2005, a much improved version of the tried-and-true -T1204. Turn on trace flag 1222 with “DBCC TRACEON (1222, -1)” or by adding “-T1222” as a SQL startup parameter.What’s that? You like digging into query plans, and have nitty grits for breakfast every morning? OK then, we’ll look at a deadlock scenario from the inside out a bit later. These steps apply to most deadlocks, and they’ll allow you to resolve many of them without even having to dig into query plans or other nitty gritty details. The typical deadlock solution is either a stored proc/app code tweak, or a schema/indexing change. With very few exceptions, deadlocks are a natural side effect of blocking, not a SQL Server bug. ![]() Sometimes we have people report that they are experiencing "deadlocking" when they are really only seeing blocking. ![]() Rerun the transaction.Ī deadlock is a special type of blocking scenario, but blocking and deadlocking are not the same thing. Transaction (Process ID 52) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. The deadlock victim will get a 1205 error: When the deadlock monitor thread in SQL Server detects a circular blocking chain, it selects one of the participants as a victim, cancels that spid’s current batch, and rolls backs his transaction in order to let the other spids continue with their work. A deadlock is a circular blocking chain, where two or more threads are each blocked by the other so that no one can proceed.
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