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Lock:Escalation Event Class

The Lock:Escalation event class indicates that a finer-grained lock has been converted to a coarser-grained lock; for example, a row lock that is converted to an object lock. The escalation event class is Event ID 60.

Data column name

Data type

Description

Column ID

Filterable

ApplicationName

nvarchar

Name of the client application that created the connection to an instance of SQL Server. This column is populated with the values passed by the application rather than the displayed name of the program.

10

Yes

ClientProcessID

int

ID assigned by the host computer to the process where the client application is running. This data column is populated if the client provides the client process ID.

9

Yes

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

DatabaseName

nvarchar

Name of the database in which the escalation occurred.

35

Yes

EventClass

int

Type of event = 60.

27

No

EventSubClass

int

Cause of the lock escalation:

0 - LOCK_THRESHOLD indicates the statement exceeded the lock threshold.

1 - MEMORY_THRESHOLD indicates the statement exceeded the memory threshold.

21

Yes

EventSequence

int

Sequence of a given event within the request.

51

No

GroupID

int

ID of the workload group where the SQL Trace event fires.

66

Yes

HostName

nvarchar

Name of the computer on which the client is running. This data column is populated if the client provides the host name. To determine the host name, use the HOST_NAME function.

8

Yes

IntegerData

int

HoBT lock count. The number of locks for the HoBT at the time of lock escalation.

25

Yes

IntegerData2

int

Escalated lock count. The total number of locks that were converted. These lock structures are deallocated because they are already covered by the escalated lock.

55

Yes

IsSystem

int

Indicates whether the event occurred on a system process or a user process. 1 = system, 0 = user.

60

Yes

LineNumber

int

Line number of Transact-SQL statement.

5

Yes

LoginName

nvarchar

Name of the login of the user (either SQL Server security login or the Microsoft Windows login credentials in the form of DOMAIN\username).

11

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

Resulting lock mode after the escalation:

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

NTDomainName

nvarchar

Windows domain to which the user belongs.

7

Yes

NTUserName

nvarchar

Windows user name.

6

Yes

ObjectID

int

System-assigned ID of the table for which lock escalation was triggered.

22

Yes

ObjectID2

bigint

ID of the related object or entity. (HoBT ID for which the lock escalation was triggered.)

56

Yes

Offset

int

Starting offset of Transact-SQL statement.

61

Yes

OwnerID

int

1=TRANSACTION

2=CURSOR

3=SESSION

4=SHARED_TRANSACTION_WORKSPACE

5=EXCLUSIVE_TRANSACTION_WORKSPACE

6=WAITFOR_QUERY

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 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 of the Transact-SQL statement that caused lock escalation.

1

Yes

TransactionID

bigint

System-assigned ID of the transaction.

4

Yes

Type

int

Lock escalation granularity:

1=NULL_RESOURCE

2=DATABASE

3=FILE

5=OBJECT (table level)

6=PAGE

7=KEY

8=EXTENT

9=RID

10=APPLICATION

11=METADATA

12=HOBT

13=ALLOCATION_UNIT

57

Yes

The following example uses the sp_trace_create procedure to create a trace, uses sp_trace_setevent to add lock escalation columns to the trace, and then uses sp_trace_setstatus to start the trace. In statements such as EXEC sp_trace_setevent @TraceID, 60, 22, 1, the number 60 indicates the escalation event class, 22 indicates the ObjectID column, and 1 sets the trace event to ON.

DECLARE @RC int, @TraceID int
EXEC @rc = sp_trace_create @TraceID output, 0, N'C:\TraceResults'
-- Set the events and data columns you need to capture.
EXEC sp_trace_setevent @TraceID, 60,  1, 1 --  1 = TextData
EXEC sp_trace_setevent @TraceID, 60, 12, 1 -- 12 = SPID
EXEC sp_trace_setevent @TraceID, 60, 21, 1 -- 21 = EventSubClass
EXEC sp_trace_setevent @TraceID, 60, 22, 1 -- 22 = ObjectID
EXEC sp_trace_setevent @TraceID, 60, 25, 1 -- 25 = IntegerData
EXEC sp_trace_setevent @TraceID, 60, 55, 1 -- 25 = IntegerData2
EXEC sp_trace_setevent @TraceID, 60, 57, 1 -- 57 = Type
-- Set any filter  byusing sp_trace_setfilter.
-- Start the trace.
EXEC sp_trace_setstatus @TraceID, 1
GO

Now that the trace is running, execute the statements that you want to trace. When they finish, execute the following code to stop and then close the trace. This example uses the fn_trace_getinfo function to get the traceid to be used in the sp_trace_setstatus statements.

-- After the trace is complete.
DECLARE @TraceID int
-- Find the traceid of the current trace.
SELECT @TraceID = traceid 
FROM ::fn_trace_getinfo(default) 
WHERE value = N'C:\TraceResults.trc'

-- First stop the trace. 
EXEC sp_trace_setstatus @TraceID, 0

-- Close and then delete its definition from SQL Server. 
EXEC sp_trace_setstatus @TraceID, 2
GO

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