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QN:Subscription Event Class

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Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

The QN:Subscription event reports information on notification subscriptions.

QN:Subscription Event Class Data Columns

Data column Type Description Column number Filterable
ApplicationName nvarchar The 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 The ID assigned by the host computer to the process where the client application is running. This data column is populated if the client process ID is provided by the client. 9 Yes
DatabaseID int The ID of the database specified by the USE database statement, or the ID of the default database if no USE databasestatement has been issued for a given instance. SQL Server Profiler displays the name of the database if the Server Name 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 The name of the database in which the user statement is running. 35 Yes
EventClass int Type of event = 199. 27 No
EventSequence int Sequence number for this event. 51 No
EventSubClass nvarchar The type of event subclass, providing further information about each event class. This column may contain the following values:

Subscription registered: Indicates when the query notification subscription is successfully registered in the database.

Subscription rewound: Indicates when the Database Engine receives a subscription request that exactly matches an existing subscription. In this case, the Database Engine sets the time-out value of the existing subscription to the time-out specified in the new subscription request.

Subscription fired: Indicates when a notification subscription produces a notification message.

Firing failed with broker error: Indicates when a notification message fails due to a Service Broker error.

Firing failed without broker error: Indicates when a notification message fails but is not due to a Service Broker error.

Broker error intercepted: Indicates that Service Broker delivered an error in the conversation that the query notification uses.

Subscription deletion attempt: Indicates that the Database Engine attempted to delete an expired subscription to free up resources.

Subscription deletion failed: Indicates that the attempt to delete an expired subscription has failed. The Database Engine will automatically reschedule the subscription for deletion to free up resources.

Subscription destroyed: Indicates that the Database Engine successfully deleted an expired subscription.		 21 Yes
GroupID int ID of the workload group where the SQL Trace event fires. 66 Yes
HostName nvarchar The name of the computer on which the client is running. This data column is populated if the host name is provided by the client. 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.

0 = user

1 = system		 60 No
LoginName nvarchar The name of the login of the user (either SQL Server security login or the Windows login credentials in the form of DOMAIN\Username). 11 No
LoginSID image The 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
NTDomainName nvarchar The Windows domain to which the user belongs. 7 Yes
NTUserName nvarchar The name of the user that owns the connection that generated this event. 6 Yes
RequestID int Identifier of the request that contains the statement. 49 Yes
ServerName nvarchar The 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 an application connects to SQL Server using Login1 and executes 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 Returns an XML document containing information specific to this event. This document conforms to the XML schema available at the SQL Server Query Notification Profiler Event Schema page. 1 Yes