sys.dm_exec_background_job_queue_stats (Transact-SQL)

Artykuł
02/13/2015

Returns a row that provides aggregate statistics for each query processor job submitted for asynchronous (background) execution.

Column name	Data type	Description
queue_max_len	int	Maximum length of the queue.
enqueued_count	int	Number of requests successfully posted to the queue.
started_count	int	Number of requests that started execution.
ended_count	int	Number of requests serviced to either success or failure.
failed_lock_count	int	Number of requests that failed due to lock contention or deadlock.
failed_other_count	int	Number of requests that failed due to other reasons.
failed_giveup_count	int	Number of requests that failed because retry limit has been reached.
enqueue_failed_full_count	int	Number of failed enqueue attempts because the queue is full.
enqueue_failed_duplicate_count	int	Number of duplicate enqueue attempts.
elapsed_avg_ms	int	Average elapsed time of request in milliseconds.
elapsed_max_ms	int	Elapsed time of the longest request in milliseconds.

Uwagi

This view returns information only for asynchronous update statistics jobs. For more information about asynchronous update statistics, see Statistics.

Permissions

Requires VIEW SERVER STATE permission on the server.

Examples

A. Determining the percentage of failed background jobs

The following example returns the percentage of failed background jobs for all executed queries.

SELECT 
        CASE ended_count WHEN 0 
                THEN 'No jobs ended' 
                ELSE CAST((failed_lock_count + failed_giveup_count + failed_other_count) / CAST(ended_count AS float) * 100 AS varchar(20)) 
        END AS [Percent Failed]
FROM sys.dm_exec_background_job_queue_stats;
GO

B. Determining the percentage of failed enqueue attempts

The following example returns the percentage of failed enqueue attempts for all executed queries.

SELECT 
        CASE enqueued_count WHEN 0 
                THEN 'No jobs posted' 
                ELSE CAST((enqueue_failed_full_count + enqueue_failed_duplicate_count) / CAST(enqueued_count AS float) * 100 AS varchar(20)) 
        END AS [Percent Enqueue Failed]
FROM sys.dm_exec_background_job_queue_stats;
GO

Zobacz także

Odwołanie

Dynamic Management Views and Functions (Transact-SQL)

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