sys.dm_exec_background_job_queue (Transact-SQL)

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SQL Server 2008 Books Online (June 2009)

sys.dm_exec_background_job_queue (Transact-SQL)

Returns a row for each query processor job that is scheduled for asynchronous (background) execution.

Column name	Data type	Description
time_queued	datetime	Time when the job was added to the queue.
job_id	int	Job identifier.
database_id	int	Database on which the job is to execute.
object_id1	int	Value depends on the job type. For more information, see the Remarks section.
object_id2	int	Value depends on the job type. For more information, see the Remarks section.
object_id3	int	Value depends on the job type. For more information, see the Remarks section.
object_id4	int	Value depends on the job type. For more information, see the Remarks section.
error_code	int	Error code if the job reinserted due to failure. NULL if suspended, not picked up, or completed.
request_type	smallint	Type of the job request.
retry_count	smallint	Number of times the job was picked from the queue and reinserted because of lack of resources or other reasons.
in_progress	smallint	Indicates whether the job has started execution. 1 = Started 0 = Still waiting
session_id	smallint	Session identifier.

Permissions

Requires VIEW SERVER STATE permission on the server.

Remarks

This view returns information only for asynchronous update statistics jobs. For more information about asynchronous update statistics, see Using Statistics to Improve Query Performance.

The values of object_id1 through object_id4 depend on the type of the job request. The following table summarizes the meaning of these columns for the different job types.

Request type	object_id1	object_id2	object_id3	object_id4
Asynchronous update statistics	Table or view ID	Statistics ID	Not used	Not used

Examples

The following example returns the number of active asynchronous jobs in the background queue for each database in the instance of SQL Server.

SELECT DB_NAME(database_id) AS [Database], COUNT(*) AS [Active Async Jobs]
FROM sys.dm_exec_background_job_queue
WHERE in_progress = 1
GROUP BY database_id;
GO

Reference

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