Lock:Deadlock Chain Event Class

The Lock:Deadlock Chain event class is produced for each participant in a deadlock.

Use the Lock:Deadlock Chain event class to monitor when deadlock conditions occur. This information is useful to determine if deadlocks are significantly affecting the performance of your application, and which objects are involved. You can examine the application code that modifies these objects to determine if changes to minimize deadlocks can be made.

Lock:Deadlock Chain Event Class Data Columns

Data column name Data type Description Column ID Filterable
BinaryData image Lock resource identifier. 2 Yes
DatabaseID int ID of the database to which this resource belongs. SQL Server Profiler displays the name of the database if the ServerName data column is captured in the trace and the server is available. Determine the value for a database by using the DB_ID function. 3 Yes
DatabaseName nvarchar Name of the database to which the resource belongs. 35 Yes
EventClass int Type of event = 59. 27 No
EventSequence int Sequence of a given event within the request. 51 No
EventSubClass int Type of event subclass.

101=Resource type Lock

102=Resource type Exchange
21 Yes
IntegerData int Deadlock number. Numbers are assigned beginning with 0 when the server is started, and incremented for each deadlock. 25 Yes
IntegerData2 int Identified for informational purposes only. Not supported. Future compatibility is not guaranteed. 55 Yes
IsSystem int Indicates whether the event occurred on a system process or a user process. 1 = system, 0 = user. 60 Yes
LoginSid image Security identification number (SID) of the logged-in user. You can find this information in the sys.server_principals catalog view. Each SID is unique for each login in the server. 41 Yes
Mode int 0=NULL - Compatible with all other lock modes (LCK_M_NL)

1=Schema Stability lock (LCK_M_SCH_S)

2=Schema Modification Lock (LCK_M_SCH_M)

3=Shared Lock (LCK_M_S)

4=Update Lock (LCK_M_U)

5=Exclusive Lock (LCK_M_X)

6=Intent Shared Lock (LCK_M_IS)

7=Intent Update Lock (LCK_M_IU)

8=Intent Exclusive Lock (LCK_M_IX)

9=Shared with intent to Update (LCK_M_SIU)

10=Shared with Intent Exclusive (LCK_M_SIX)

11=Update with Intent Exclusive (LCK_M_UIX)

12=Bulk Update Lock (LCK_M_BU)

13=Key range Shared/Shared (LCK_M_RS_S)

14=Key range Shared/Update (LCK_M_RS_U)

15=Key Range Insert NULL (LCK_M_RI_NL)

16=Key Range Insert Shared (LCK_M_RI_S)

17=Key Range Insert Update (LCK_M_RI_U)

18=Key Range Insert Exclusive (LCK_M_RI_X)

19=Key Range Exclusive Shared (LCK_M_RX_S)

20=Key Range Exclusive Update (LCK_M_RX_U)

21=Key Range Exclusive Exclusive (LCK_M_RX_X)
32 Yes
ObjectID int ID of the object that was locked, if available and applicable. 22 Yes
ObjectID2 bigint The ID of the related object or entity, if available and applicable. 56 Yes




58 Yes
RequestID int ID of the request containing the statement. 49 Yes
ServerName nvarchar Name of the instance of SQL Server being traced. 26 No
SessionLoginName nvarchar Login name of the user who originated the session. For example, if you connect to SQL Server using Login1 and execute a statement as Login2, SessionLoginName shows Login1 and LoginName shows Login2. This column displays both SQL Server and Microsoft Windows logins. 64 Yes
SPID int ID of the session on which the event occurred. 12 Yes
StartTime datetime Time at which the event started, if available. 14 Yes
TextData ntext Text value dependent on the resource type. 1 Yes
TransactionID bigint System-assigned ID of the transaction. 4 Yes












57 Yes

See Also

sp_trace_setevent (Transact-SQL)
sys.dm_tran_locks (Transact-SQL)