Blocked Process Report Event Class

The Blocked Process Report event class indicates that a task has been blocked for more than a specified amount of time. This event class does not include system tasks or tasks that are waiting on non deadlock-detectable resources.

To configure the threshold and frequency at which reports are generated, use the sp_configure command to configure the blocked process threshold option, which can be set in seconds. By default, no blocked process reports are produced. For more information about setting the blocked process threshold option, see blocked process threshold Server Configuration Option.

For information about filtering the data returned by the Blocked Process Report event class, see Filter Events in a Trace (SQL Server Profiler), Set a Trace Filter (Transact-SQL), or sp_trace_setfilter (Transact-SQL).

Blocked Process Report Event Class Data Columns

Data column name Data type Description Column ID Filterable
DatabaseID int ID of the database in which the lock was acquired. 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
Duration bigint The amount of time (in milliseconds) that the process was blocked. 13 Yes
EndTime datetime Time at which the event ended. This column is not populated for starting event classes, such as SQL:BatchStarting or SP:Starting. 15 Yes
EventClass int Type of event = 137. 27 No
EventSequence int The sequence of a given event within the request. 51 No
IndexID int ID for the index on the object affected by the event. To determine the index ID for an object, use the indid column of the sysindexes system table. 24 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 identifier (SID) of the logged-in user. This event is always reported from the system thread. IsSystem = 1; SID = sa. 41 Yes
Mode int The state the event has received or is requesting.

0=NULL

1=Sch-S

2=Sch-M

3=S

4=U

5=X

6=IS

7=IU

8=IX

9=SIU

10=SIX

11=UIX

12=BU

13=RangeS-S

14=RangeS-U

15=RangeI-N

16=RangeI-S

17=RangeI-U

18=RangeI-X

19=RangeX-S

20=RangeX-U

21=RangeX-X
32 Yes
ObjectID int System-assigned ID of the object on which the lock was acquired, if available and applicable. 22 Yes
ServerName nvarchar Name of the instance of SQL Server being traced. 26
SessionLoginName nvarchar The login name of the user that 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 Windows logins. 64 Yes
TextData ntext Text value dependent on the event class captured in the trace. 1 Yes
TransactionID bigint System-assigned ID of the transaction. 4 Yes

See Also

sp_trace_setevent (Transact-SQL)
sp_configure (Transact-SQL)