CursorUnprepare Event Class

The CursorUnprepare event class provides information about cursor unprepare events that occur in application programming interface (API) cursors. Cursor unprepare events occur when the Microsoft Database Engine discards an execution plan.

Include the CursorUnprepare event class in traces that record the performance of cursors. When the CursorUnprepare event class is included in a trace, the amount of overhead incurred depends on how frequently cursors are used against the database during the trace. If cursors are used extensively, the trace can significantly impede performance.

CursorUnprepare Event Class Data Columns

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 with 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 specified by the USE statement or the default database if no USE statement has been issued for a given instance. 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 user statement is running. 35 Yes
EventClass int Type of event recorded = 77. 27 No
EventSequence int Batch sequence of the CursorUnprepare event class. 51 No
GroupID int ID of the workload group where the SQL Trace event fires. 66 Yes
Handle Int Identifies the prepared handle that is being unprepared. 33 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
IsSystem int Indicates whether the event occurred on a system process or a user process. 1 = system, 0 = user. 60 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 identifier (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
NTDomainName nvarchar Windows domain to which the user belongs. 7 Yes
NTUserName nvarchar Windows user name. 6 Yes
RequestID int Request identification that unprepared the cursor. 49 Yes
ServerName nvarchar Name of the instance of SQL Server being traced. 26 No
SessionLoginName nvarchar 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
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
TransactionID bigint System-assigned ID of the transaction. 4 Yes
XactSequence bigint Token that describes the current transaction. 50 Yes

See Also

sp_trace_setevent (Transact-SQL)