I was reviewing my index rebuild and recreate activities. Some index rebuilding tasks are scheduled once or twice a week. I followed the best practices for the activities. However, it was not yielding expected performance gain. So, wondering what could be going wrong! Are there any hidden issues hindering the performance? I kept searching for potential clues in my favourite SQL Server gurus writing and compiled the hidden facts. Let's share my findings with you.
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When it comes to SQL Server performance tuning, few settings spark as much debate as MAXDOP—Maximum Degree of Parallelism. This small but powerful configuration controls how many processors SQL Server can use to execute a single query in parallel. While parallelism can speed up queries, it can also lead to unexpected issues like CPU pressure, query blocking, or inconsistent performance across workloads.
In this article, we will explore what MAXDOP really does, why it matters, and how to configure it wisely to strike the right balance between speed and stability in your SQL Server environment.
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