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Threadpool - A deadly poison wait for SQL Server (The What, When and How)

Introduction  Threadpool is a  poison  wait. Yes, I mean it. Its poison for SQL Server, its poison for the Business and of course, the end-users! The most devastating thing about threadpool is you hardly recognize it because it comes in disguise, meaning you see no memory or cpu pressure in the system, yet you cannot run any query, it seems like your SQL Server is frozen solid. That scary, isn't it?