sys.dm_os_schedulers current_worker_count

Question

sys.dm_os_schedulers has a column call current_worker_count .
May I know what's the situation that this current_worker_count will be reset .?

as I know active_workers_count < this number will be changed dynamically by SOS . thanks

Answer 1

Hi @sakuraime ,

The Scheduler is responsible for creating and destroying Workers according to requirements. Workers use Scheduler directly. Each Worker can only be associated with one Scheduler. Workers cannot be transferred from one Scheduler to another.

The unit of work processed by the Worker can be a Request or a Task. For example, batch processing Request may be decomposed into multiple Tasks. When the Scheduler receives a new Request or Task request, if there is no idle Worker (Idle Worker) currently, it will start to create a new Worker according to the configuration, and the Request or Task will be bound to the Worker.

I find a blog explain this, but the blog is in Chinese, please refer to SQL Server scheduler.

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Answer 2

I do not ever suggest changing the max worker threads on a system (since SQL 2000). The default value is good for 99.99% of installations. This is not something you normally need to worry about.