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Deadlocks are typically caused by long-running transactions, or different transactions accessing the same objects in an inconsistent order. A lack of useful indexes, poorly written code, and hardware bottlenecks can all cause transactions to run longer than they should, resulting in locks held for longer than necessary. If statements in different stored procedures access tables in different orders (for example, one procedure first updates Table1 and then updates Table2, whereas another procedure first updates Table2 and then Table1), it s possible for two transactions to be holding a lock on the one object and wanting a lock on the other, resulting in a deadlock. Isolation levels higher than the default (Read Committed) can also cause frequent deadlocks, as the locks are held longer, or more intrusive locks are held. This is true with the Serializable isolation level.
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A deadlock graph is a representation of the processes involved in a deadlock, the locks that they held, and the resources that they were using. Deadlock graphs contain all the information needed to diagnose the cause of the deadlock, though not necessarily in a form that s easy to understand. You may get a deadlock graph on SQL Server 2005 and SQL Server 2008 in three main ways. SQL Profiler includes a deadlock graph event, and there are two trace flags: 1204 and 1222. Of these, only trace flag 1204 was available on SQL Server 2000.
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Trace flag 1204
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Trace flag 1204 is one of the oldest ways to view a deadlock graph, and is the only method available on SQL Server 2000 or earlier.
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To produce the deadlock graph, the trace flag needs to be enabled server-wide either using the DBCC TRACEON command (DBCC TRACEON (1204,-1)), or by adding the trace flag to SQL Server s startup parameters (-T1204).
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Trace flag 1222
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Trace flag 1222 works much the same as 1204 does, in that it writes deadlock information into the error log. The results produced by 1222 are far more detailed and easier to read than those produced by 1204. As such, it s preferred over 1204 for producing deadlock information on SQL Server 2005 or 2008. Trace flag 1222 is enabled the same way as 1204 is, by using the TRACEON command (DBCC TRACEON (1222,-1)), or by adding the trace flag to the startup parameters (-T1222).
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NOTE
Despite popular belief, trace flag 3605 doesn t have to be enabled with 1204 or 1222 to write a deadlock graph into the error log.
SQL Profiler
In SQL Server 2005, the deadlock graph event was added to SQL Profiler. This event produces a graphical view of a deadlock graph that shows the processes, resources, and locks involved in a deadlock. The graph is saved in XML format and can be viewed in Management Studio. This option requires that a trace be running against the target server. If deadlocks happen frequently, or can be reproduced on demand, this is a good way of getting the deadlock graph. If the deadlocks happen infrequently, it may not be feasible to run the profiler for long periods of time. In that case, trace flags may be a more appropriate option.
NOTE
The Profiler GUI can cause an undesirable performance impact on a busy server. As such, server-side trace procedures should be used on production servers, and Profiler itself should be limited to development or test environments. Details of the server-side trace procedures are beyond the scope of this chapter. Full details on the sp_trace procedures can be found in Books Online.
Reading the deadlock graph
At a first glance, the deadlock graph produced by trace flag 1222 seems impossibly obtuse and near-impossible to read. In truth, much of the information given can be ignored, and it s mostly a case of knowing where to look and how to interpret the information given. In this section, I m going to walk through a deadlock graph, line by line, pointing out what sections are important and what they mean. Listing 1 shows an example of a deadlock graph (trimmed slightly so that it doesn t take three pages).
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