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How To Enable Deadlock Trace in Microsoft SQL Server




How to Enable Deadlock Trace
To enable deadlock trace we should do in 2 steps
a.      Enable from query analyzer
b.      Update startup parameters

1.      we should use below command
dbcc traceon (1222 ,-1)
dbcc traceon (3604 ,-1) 
dbcc traceon (3605 ,-1)



Trace Flag
Description
3604
Sends trace output to the client. Used only when setting trace flags with DBCC TRACEON and DBCC TRACEOFF.
3605
Sends trace output to the error log.  (if SQL Server is started from CMD output also appears on the screen
1222
Returns the resources and types of locks that are participating in a deadlock and also the current command affected, in an XML format that does not comply with any XSD schema. Scope: global only
1204
Returns the resources and types of locks participating in a deadlock and also the current command affected Scope is  global only


Enable deadlock trace


Here “dbcc  tracestatus” will give you list of traces enable rt now.
But this is not enough Bacause  once sql server is restarted this traces will not remain in picture any more. So if you want to enable these traces permanently and unaffected with sql services recyling, We have to add these in startup parametures
2.      Open sql server configuration manger  --> SQl services  --> properties --> Advance --> Properties -->







Startup parameters will be:
-dD:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master.mdf;-eD:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\Log\ERRORLOG;-lD:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\mastlog.ldf;-T1222; -T3604;  -T3605

To understand working of deadlock , please refer : Sql server deadlock Mechanism

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