SQL Transaction was deadlocked

I solved like problem using ReadCommited isolation level.


Set up a server-side SQL trace which captures deadlock graph events so you can look at the .trc file with SQL Profiler. This way you can have something in place to be able to troubleshoot any deadlock. I have provided the code below. You will have to change the file path as appropriate. It would be a good idea to configure this script to execute on SQL server startup.

FYI - A lot of different things can cause a deadlock, one of them being missing indexes. 

declare @rc int
declare @TraceID int
declare @maxfilesize bigint
set @maxfilesize = 10 
declare @dtName nvarchar(50)
select @dtName=(N'I:\Trace_Logs\DeadLockTrace'+ convert(nvarchar(8),getdate(),112))


-- Please replace the text InsertFileNameHere, with an appropriate
-- filename prefixed by a path, e.g., c:\MyFolder\MyTrace. The .trc extension
-- will be appended to the filename automatically. If you are writing from
-- remote server to local drive, please use UNC path and make sure server has
-- write access to your network share

exec @rc = sp_trace_create @TraceID output, 2, @dtName, @maxfilesize, NULL ,365

if (@rc != 0) goto error

-- Client side File and Table cannot be scripted

-- Set the events
declare @on bit
set @on = 1
exec sp_trace_setevent @TraceID, 148, 11, @on
exec sp_trace_setevent @TraceID, 148, 51, @on
exec sp_trace_setevent @TraceID, 148, 4, @on
exec sp_trace_setevent @TraceID, 148, 12, @on
exec sp_trace_setevent @TraceID, 148, 14, @on
exec sp_trace_setevent @TraceID, 148, 26, @on
exec sp_trace_setevent @TraceID, 148, 60, @on
exec sp_trace_setevent @TraceID, 148, 64, @on
exec sp_trace_setevent @TraceID, 148, 1, @on
exec sp_trace_setevent @TraceID, 148, 41, @on
exec sp_trace_setevent @TraceID, 25, 7, @on
exec sp_trace_setevent @TraceID, 25, 15, @on
exec sp_trace_setevent @TraceID, 25, 55, @on
exec sp_trace_setevent @TraceID, 25, 8, @on
exec sp_trace_setevent @TraceID, 25, 32, @on
exec sp_trace_setevent @TraceID, 25, 56, @on
exec sp_trace_setevent @TraceID, 25, 64, @on
exec sp_trace_setevent @TraceID, 25, 1, @on
exec sp_trace_setevent @TraceID, 25, 9, @on
exec sp_trace_setevent @TraceID, 25, 25, @on
exec sp_trace_setevent @TraceID, 25, 41, @on
exec sp_trace_setevent @TraceID, 25, 49, @on
exec sp_trace_setevent @TraceID, 25, 57, @on
exec sp_trace_setevent @TraceID, 25, 2, @on
exec sp_trace_setevent @TraceID, 25, 10, @on
exec sp_trace_setevent @TraceID, 25, 26, @on
exec sp_trace_setevent @TraceID, 25, 58, @on
exec sp_trace_setevent @TraceID, 25, 3, @on
exec sp_trace_setevent @TraceID, 25, 11, @on
exec sp_trace_setevent @TraceID, 25, 35, @on
exec sp_trace_setevent @TraceID, 25, 51, @on
exec sp_trace_setevent @TraceID, 25, 4, @on
exec sp_trace_setevent @TraceID, 25, 12, @on
exec sp_trace_setevent @TraceID, 25, 52, @on
exec sp_trace_setevent @TraceID, 25, 60, @on
exec sp_trace_setevent @TraceID, 25, 13, @on
exec sp_trace_setevent @TraceID, 25, 6, @on
exec sp_trace_setevent @TraceID, 25, 14, @on
exec sp_trace_setevent @TraceID, 25, 22, @on
exec sp_trace_setevent @TraceID, 59, 55, @on
exec sp_trace_setevent @TraceID, 59, 32, @on
exec sp_trace_setevent @TraceID, 59, 56, @on
exec sp_trace_setevent @TraceID, 59, 64, @on
exec sp_trace_setevent @TraceID, 59, 1, @on
exec sp_trace_setevent @TraceID, 59, 21, @on
exec sp_trace_setevent @TraceID, 59, 25, @on
exec sp_trace_setevent @TraceID, 59, 41, @on
exec sp_trace_setevent @TraceID, 59, 49, @on
exec sp_trace_setevent @TraceID, 59, 57, @on
exec sp_trace_setevent @TraceID, 59, 2, @on
exec sp_trace_setevent @TraceID, 59, 14, @on
exec sp_trace_setevent @TraceID, 59, 22, @on
exec sp_trace_setevent @TraceID, 59, 26, @on
exec sp_trace_setevent @TraceID, 59, 58, @on
exec sp_trace_setevent @TraceID, 59, 3, @on
exec sp_trace_setevent @TraceID, 59, 35, @on
exec sp_trace_setevent @TraceID, 59, 51, @on
exec sp_trace_setevent @TraceID, 59, 4, @on
exec sp_trace_setevent @TraceID, 59, 12, @on
exec sp_trace_setevent @TraceID, 59, 52, @on
exec sp_trace_setevent @TraceID, 59, 60, @on

-- Set the Filters
declare @intfilter int
declare @bigintfilter bigint

-- Set the trace status to start
exec sp_trace_setstatus @TraceID, 1

-- display trace id for future references
select TraceID=@TraceID
goto finish

error: 
select ErrorCode=@rc

finish: 
go

I would suggest that you come at the problem from two perspectives.

  1. Trap or Catch Deadlock Errors so that you can re-run the transaction that is chosen as the Deadlock Victim by the SQL Server database engine.

  2. Find out what is causing your Deadlock Events. You can do this in one of two ways, either run a SQL Server Profiler Trace to catch and record the Deadlock Event or you can enable some SQL Server Trace Flags that will record the details of the Deadlock Event to the SQL Server Error Log.

In the vast majority of cases, you can identify the cause of your Deadlock Events and remedy the situation through either a structural change in the database schema or a logical change to the code involved/responsible for the Deadlock Event.

For further reading take a look at:

  • How to track down Deadlocks Using SQL Server Profiler
  • Minimizing Deadlocks
  • Detecting and Ending Deadlocks

I hope I've answered your question but do let me know if I can help you further in any way.

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