![]() However, if you compare the relative amount of information provided here, even if you use the hover tips on the individual processes, there is still a significant amount of information that is missing. I didn’t actually realize this until I was recording the next Insider Demo Video for our SQLskills Insiders Newsletter, but SQL Server 2012 Management Studio has also been updated to handle the XML format output by Extended Events, and it also understands the multi-victim deadlock information. A few hours later I had another beta build that handled the multi-victim deadlock graph format provided by Extended Events which is shown below. While I was beta testing the changes ahead of the public release, I mentioned that the XML from the deadlock graphs generated by Extended Events had a different output to support multi-victim deadlock analysis, and Brooke (the developer for Plan Explorer at SQL Sentry) asked for an example. The display is exactly the same display that you would get from Performance Advisor for deadlocks proactively collected during it’s monitoring, which really simplifies the analysis of the deadlock graph information. One of the new Pro features that was added in SQL Sentry Plan Explorer at the beginning of November 2012 was the ability to open deadlock graph. Until recently there wasn’t anything you could do about this, but today there are two options for viewing the deadlock graph in graphical format SQL Sentry Plan Explorer Pro and SQL Server 2012 Management Studio. There is an error in XML document (1, 2). If you attempt to open an Extended Events deadlock graph you will get an error similar to the following: As a result of this, the deadlock graphs that are provided by Extended Events in SQL Server 2008 cannot be saved and opened graphically inside of SQL Server Management Studio. One of the side effects of this change was that the XML document for the deadlock report had to be modified to be able to accommodate multiple victim processes in the graph. ![]() ’ve previously blogged about the changes to the xml_deadlock_report in Extended Events to support multi-victim deadlock analysis. ![]() ( '//RingBufferTarget/event') AS XEventData (XEvent) Where name = 'system_health') AS Data CROSS APPLY TargetData.nodes ( Select CAST(x.DeadlockGraph as xml) As DeadlockGraph I know if I can extract the sqlhanle from the XML I will be able to get the queries that are causing deadlocks, so I modified the above query a bit to get my the sqlhanle alone. So, I started to review the XML to see if I could any hint to retrieve the SQL statements and I found sqlhanle. value( 'varchar(4000)') = 'xml_deadlock_report'īut the above query give me a list of deadlock graph in xml (screenshot below), I have no clue how to use it and I was very much looking for the queries that are causing the deadlocks. TargetData.nodes ( '//RingBufferTarget/event') AS XEventData (XEvent) Where name = 'system_health') AS Data CROSS APPLY ![]() Join sys.dm_xe_sessions s on s.address = st.event_session_address ( select CAST(target_data as xml) as TargetData value( '(data/value)', 'varchar(max)') as DeadlockGraph This time I was with luck and found out a very interesting article.įrom this I learned that Deadlock Graph can be retrieved from SQL Server Extended events.Īnd from the article below query is of my interest, it give me a list of deadlock graph (I think this give the list of deadlock that has recently occurred) select With the thought in mind “is there any way to retroactively find the deadlock information” I started googling out. To nail down the issue we decided to run the load test again with SQL trace but to my bad luck I couldn’t catch anything on the trace. ![]() To me this clearly hints that there is some problem in query/database. “ Transaction (Process ID 942) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. This evening performance engineer told me that some of her test case are failing during the load test with the below error message. ![]()
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