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sys.dm_os_dispatcher_pools (Transact-SQL)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Returns information about session dispatcher pools. Dispatcher pools are thread pools used by system components to perform background processing.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Data Warehouse Public Preview.

Note Note

To call this from SQL Data Warehouse, use the name sys.dm_pdw_nodes_os_dispatcher_pools.

Column name

Data type

Description

dispatcher_pool_address

varbinary(8)

The address of the dispatcher pool. dispatcher_pool_address is unique. Is not nullable.

type

nvarchar(256)

The type of the dispatcher pool. Is not nullable. There are two types of dispatcher pools:

  • DISP_POOL_XE_ENGINE

  • DISP_POOL_XE_SESSION

name

nvarchar(256)

The name of the dispatcher pool. Is not nullable.

dispatcher_count

int

The number of active dispatcher threads. Is not nullable.

dispatcher_ideal_count

int

The number of dispatcher threads that the dispatcher pool can grow to use. Is not nullable.

dispatcher_timeout_ms

int

The time, in milliseconds, that a dispatcher will wait for new work before exiting. Is not nullable.

dispatcher_waiting_count

int

The number of idle dispatcher threads. Is not nullable.

queue_length

int

The number of work items waiting to be handled by the dispatcher pool. Is not nullable.

Requires VIEW SERVER STATE permission on the server.

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