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In the world of database management, controlling system resources and optimization are two of the most important aspects. Luckily for SQL Server users, Microsoft introduced a very handy feature called the Resource Governor. The Resource Governor allows you to manage SQL Server workload and system resource consumption by specifying limits on resource consumption by incoming requests.
Understanding SQL Server Resource Governor
Using SQL Server Resource Governor, you can regulate the utilization of CPU, physical IO, and memory resources. It uses classifier function, a user-defined function created in Transact-SQL, to route incoming connections to different workloads.
Here’s an example to showcase how a typical Resource Governor classifier function looks:
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CREATE FUNCTION dbo.ResourceGovernorClassifier() RETURNS SYSNAME WITH SCHEMABINDING AS BEGIN DECLARE @WorkloadGroup AS sysname; IF (ORIGINAL_LOGIN() = 'ApplicationUser') SET @WorkloadGroup = 'WorkloadGroupForApplicationUser'; ELSE SET @WorkloadGroup = 'default'; RETURN @WorkloadGroup; END GO ALTER RESOURCE GOVERNOR WITH (CLASSIFIER_FUNCTION = dbo.ResourceGovernorClassifier); ALTER RESOURCE GOVERNOR RECONFIGURE; |
Creating and Configuring Workload
Workloads are created by associating them with resource pools and then directing the incoming connection to a specific workload by classifier function. Following example SQL code will help in understanding:
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CREATE WORKLOAD GROUP WGFinance USING POOL FinancePool; GO CREATE WORKLOAD GROUP WGHR USING POOL HRPool; GO |
Resource Pools
Resource pools are defined for setting limits and capacities on the system resources that SQL Server process can consume. Here’s an example:
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CREATE RESOURCE POOL FinancePool WITH ( MIN_CPU_PERCENT = 20, MAX_CPU_PERCENT = 70, CAP_CPU_PERCENT = 100, AFFINITY SCHEDULER = AUTO, MIN_MEMORY_PERCENT = 30, MAX_MEMORY_PERCENT = 50 ); GO |
In conclusion, the SQL Server Resource Governor is a powerful tool in managing and regulating the SQL server resources for an optimal SQL environment. It allows for a smoother execution of operations and better workload management.
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