Edit

Auto Stats Event Class

  • Article

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

The Auto Stats event class indicates that an automatic updating of index and column statistics has occurred. Auto Stats also fires when statistics are being loaded for use by the optimizer.

Auto Stats 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 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 Identifier of the database specified by the USE database statement or the default database if no USE database 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
Duration bigint Amount of time (in microseconds) taken by the event. 13 Yes
EndTime datetime Time at which the event ended. 15 Yes
Error int Error number of a given event. Often this is the error number stored in the sys.messages catalog view. 31 Yes
EventClass int Type of event = 58. 27 No
EventSequence int Sequence of a given event within the request. 51 No
EventSubClass int Type of event subclass:

1: Statistics created/updated synchronously; TextData column indicates which statistics and whether they were created or updated

2: Asynchronous statistics update; job queued.

3: Asynchronous statistics update; job starting.

4: Asynchronous statistics update; job completed.		 21 Yes
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 host name is provided by the client. To determine the host name, use the HOST_NAME function. 8 Yes
IndexID int ID for the index/statistics entry on the object affected by the event. To determine the index ID for an object, use the index_id column of the sys.indexes catalog view. 24 Yes
IntegerData int Number of statistics collections that were successfully updated. 25 Yes
IntegerData2 int Job sequence number. 55 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 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
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 object. 22 Yes
RequestID int The 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 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
Success int 0 = error.

1 = success.

2 = skipped due to server throttling (MSDE).		 23 Yes
TextData ntext Contents of this column depends on whether statistics are updated synchronously (EventSubClass 1) or asynchronously (EventSubClass 2, 3, or 4):

1: Lists which statistics were updated/created

2, 3, or 4: NULL; IndexID column is populated with the index/statistics ID for statistics updated.		 1 Yes
TransactionID bigint System-assigned ID of the transaction. 4 Yes
Type int Type of job. 57 Yes

See Also

Extended Events
sp_trace_setevent (Transact-SQL)