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One of the primary challenges in managing any substantial SQL Server environment is maintaining optimal performance levels. The Resource Governor, a technology available in SQL Server, allows you to manage SQL Server workload and system resource consumption with great flexibility and detail. This blog post will provide an understanding of how this technology works and how to use it to manage performance.
What is the SQL Server Resource Governor?
The SQL Server Resource Governor is a feature that enables you to specify limits on the amount of system resources a certain database or application can use. This is accomplished by creating resource pools and workload groups, then assigning these groups to specific sessions or tasks. By doing this, one can prevent a single resource-intensive application or database from consuming resources that are needed by other applications or databases, thereby enhancing the performance of the entire server.
Examples of SQL Server Resource Governor
Creating a Resource Pool
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CREATE RESOURCE POOL FastLanePool WITH (MIN_CPU_PERCENT = 0, MAX_CPU_PERCENT = 100, CAP_CPU_PERCENT = 100, MIN_MEMORY_PERCENT = 0, MAX_MEMORY_PERCENT = 100); |
The above SQL command creates a new resource pool named ‘FastLanePool’. This pool is dedicated to tasks that require a lot of resources. The command sets both the CPU and memory usage to their maximum percentages, ensuring that tasks in this pool will get the most resources.
Creating a Workload Group
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CREATE WORKLOAD GROUP FastLaneGroup USING FastLanePool; |
After creating a resource pool, the next step is to create a workload group. The above SQL command creates a new workload group named ‘FastLaneGroup’. This group will use the ‘FastLanePool’ we created earlier.
Assigning a Session to a Workload Group
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ALTER RESOURCE GOVERNOR WITH (CLASSIFIER_FUNCTION = dbo.fn_ClassifyDBRequests); GO |
The final step is assigning sessions to the workload group. You’ll have to create a function (like ‘fn_ClassifyDBRequests’ in the above example) which contains the criteria for assigning sessions to groups.
Conclusion
In conclusion, SQL Server’s Resource Governor is a powerful tool for managing server resources, and mastering its usage can greatly enhance your server’s performance. With it, you can ensure that your most important databases or applications always have access to the resources they need.