sys.dm_os_dispatcher_pools (Transact-SQL)

Applies to: SQL Server Azure Synapse Analytics Analytics Platform System (PDW)

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


To call this from Azure Synapse Analytics or Analytics Platform System (PDW), use the name sys.dm_pdw_nodes_os_dispatcher_pools. This syntax is not supported by serverless SQL pool in Azure Synapse Analytics.

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:



Query the DMV for the full list
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.
pdw_node_id int Applies to: Azure Synapse Analytics, Analytics Platform System (PDW)

The identifier for the node that this distribution is on.


On SQL Server and SQL Managed Instance, requires VIEW SERVER STATE permission.

On SQL Database Basic, S0, and S1 service objectives, and for databases in elastic pools, the server admin account, the Microsoft Entra admin account, or membership in the ##MS_ServerStateReader## server role is required. On all other SQL Database service objectives, either the VIEW DATABASE STATE permission on the database, or membership in the ##MS_ServerStateReader## server role is required.

Permissions for SQL Server 2022 and later

Requires VIEW SERVER PERFORMANCE STATE permission on the server.