THREADPOOL and SQL Server threads. Just like most of the Windows software, SQL Server is operating under thread model. This means the SQL Server process would spawn child threads to execute the work.

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View the SQL Server thread. We can use sysinternal tools pstools or procexp to see the current SQL Server threads.

This is thread tab under the procexppslist. Above is the screenshot of the output from pslist, it is about 4. SQL Server processes.

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However not all threads are “SQL Server worker threads” which are the actual threads that can work on the user requests. In my test env, my current worker threads is 4. The minimum value from sp. The current worker threads would increase over time till the max.

If the request is in the pending state or waiting for other resources, the work thread still need to tied to the session until the resource become available. Since there are only limited number of the work threads, if all work threads has been used up, the SQL server would basically hang and can not accept new user connection. We will also see the error message like below: 2. Server      New queries assigned to process on Node 0 have not been picked up by a worker thread in the last 6. Blocking or long- running queries can contribute to this condition, and may degrade client response time. SQL Process Utilization: 0%. System Idle: 7. 5%.

Here are the steps to reproduce the issue: Create the test env use master. CREATEDATABASE . But share lock is not compatible with exclusive lock therefore all the query would be block and all the worker threads has been used out. No new connections can be accept to the sql server .

The sql server becomes hang . Once the spid is gone. Solution 2 : Increase the max worker threads“max worker threads”  is RR in 2. R2, so increase it would require SQL server bounce to make it effective. Base on Book on line, it seems to be dynamic in 2. SOLUTION 3: set the database to READ. ALTER DATABASE THREADPOOL.

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