![]() Let’s look at the other two requests in Figure 1. ![]() Because any unhandled request from the classifier function goes to the default group, which in turn sends it to the default pool, those requests will end up in the default pool. Therefore, when a request from SQL Server Agent or the website (IIS) comes through the classifier function, it does not return a group name because it does not handle those requests. All other requests are “thrown on the floor”-the classifier function does not handle them. If you look carefully at the classifier function we created, you will see that it checks the name of the application that the request is coming from and handles two cases: ‘%MANAGEMENT STUDIO%’ and ‘%REPORT%’. The internal workload group then sends the request to the internal resource pool.įigure 1: How Resource Governor handles the flow of requests We will use the same resource pools (POOLA and POOLB), workload groups (UserA, ReportApp), and classifier function (Class_funct) that we created earlier to examine how Resource Governor handles the flow of requests.Īs Figure 1 shows, when an internal or DAC request comes in, it skips the classifier function and goes straight to the internal workload group. Now let’s look at how they work together. We have seen Resource Governor’s three main components separately. Let’s look closely at each of these components. A workload group is a set of requests you define, and the classifier function directs the incoming request to a specific workload group. A small chunk of these two resources is known as a resource pool. The CPU and memory dedicated to the SQL Server are the resources, and these can be pooled to various applications or users. When you think about Resource Governor, keep these three fundamental components in mind: resource pools, workload groups, and classifier functions. Resource Governor not only gives you the ability to cap the maximum usage, but it also lets you set the minimums, providing the right resource level to the right application or user. Resource Governor works similarly, ensuring that one runaway query doesn’t consume your entire server’s firepower. You may have heard of something called rate limiting or throttling bandwidth, which ensures that you do not use up all the bandwidth available when you are downloading or surfing the ‘net and bog down other users. Let’s get started! What Is Resource Governor? Along the way, we will look at a schematic explanation of how Resource Governor handles requests from different clients, some best practices for using Resource Governor, and how to set up and disable it. We will explore the three Ws-what, when, and why-regarding Resource Governor. If you are an IT pro or DBA responsible for managing high availability, virtualization, or scaling, this article is for you. You can currently use Resource Governor to govern two resources: CPU and memory. However, Resource Governor is not just about limiting the resources your SQL Server uses but also about providing a guaranteed minimum, letting you dictate and monitor how a SQL Server instance behaves. As its name implies, Resource Governor lets you control the resources available to SQL Server. You can also look to a feature that first appeared in SQL Server 2008 Enterprise Edition called Resource Governor to help you stretch your resources. A trend over the past 3 or 4 years has been to consolidate and/or virtualize so that you can do more with less.
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