DOP, degree of parallelism. This concept will be familiar to those who work with databases. It is the name given to the number of CPUs used in a query. SQL Server runs CPUs in parallel, especially in concepts such as Join, order by, and group by. Theoretically, the more processors there are, the better the performance and the shorter the query time. But in reality, this is not exactly the case.

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SQL Server 2022 Yenilikler, Intelligent Query Processing, DOP Feedback