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sys.dm_broker_queue_monitors (Transact-SQL)

  • Článek

Applies to: SQL Server

Returns a row for each queue monitor in the instance. A queue monitor manages activation for a queue.

Column name Data type Description
database_id int Object identifier for the database that contains the queue that the monitor watches. Nullable.
queue_id int Object identifier for the queue that the monitor watches. Nullable.
state nvarchar(32) State of the monitor. Nullable. This value is one of the following options:

INACTIVE
NOTIFIED
RECEIVES_OCCURRING
last_empty_rowset_time datetime Last time that a RECEIVE from the queue returned an empty result. Nullable.
last_activated_time datetime Last time that this queue monitor activated a stored procedure. Nullable.
tasks_waiting int Number of sessions that are currently waiting within a RECEIVE statement for this queue. Nullable.

Note: This number includes any session executing a receive statement, regardless of whether the queue monitor started the session. This is for when you use WAITFOR together with RECEIVE. In other words, these tasks are waiting for messages to arrive on the queue.

Permissions

SQL Server 2019 (15.x) and earlier versions require VIEW SERVER STATE permission on the server.

SQL Server 2022 (16.x) and later versions require VIEW SERVER PERFORMANCE STATE permission on the server.

Examples

A. Current status queue monitor

This scenario provides the current status of all message queues.

SELECT DB_NAME() AS [Database_Name],
       s.[name] AS [Service_Name],
       sch.[name] AS [Schema_Name],
       q.[name] AS [Queue_Name],
       ISNULL(m.[state], N'Not available') AS [Queue_State],
       m.tasks_waiting,
       m.last_activated_time,
       m.last_empty_rowset_time,
       (SELECT COUNT(1)
        FROM sys.transmission_queue AS t6
        WHERE t6.from_service_name = s.[name]) AS Tran_Message_Count
FROM sys.services AS s
     INNER JOIN sys.databases AS d
         ON d.database_id = DB_ID()
     INNER JOIN sys.service_queues AS q
         ON s.service_queue_id = q.[object_id]
     INNER JOIN sys.schemas AS sch
         ON q.[schema_id] = sch.[schema_id]
     LEFT OUTER JOIN sys.dm_broker_queue_monitors AS m
         ON q.[object_id] = m.queue_id
        AND m.database_id = d.database_id;

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