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sys.dm_hadr_ag_threads (Transact-SQL)

The HADR thread telemetry DMVs (sys.dm_hadr_ag_threads and sys.dm_hadr_db_threads) allow users to quickly gain insight into thread usage by availability group and by high availability database. Understanding this thread usage is an important benchmark for tuning availability groups.

This DMV reports on thread usage at the availability group level.

Column name Data type Description
group_id uniqueidentifier Identifier of the availability group.
name nvarchar(128) Name of the availability group.
num_databases int Number of databases in the availability group.
num_capture_threads int Number of log capture threads used by all databases in this availability group.
num_redo_threads int Number of redo threads used by all databases in this availability group.
num_parallel_redo_threads int Number of parallel redo threads used by all databases in this availability group.
num_hadr_threads int Number of all always on threads used by all databases in this availability group.

Permissions

Requires VIEW SERVER STATE permission on the server.

Permissions for SQL Server 2022 and later

Requires VIEW SERVER PERFORMANCE STATE permission on the server.

See also

Always On Availability Groups Dynamic Management Views and Functions (Transact-SQL)
Always On Availability Groups Catalog Views (Transact-SQL)
Monitor Availability Groups (Transact-SQL)
Always On Availability Groups (SQL Server)