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One of the common recommendations for systems supporting a large number of connections is to increase the number of worker threads in an attempt to increase throughput. Although this may improve performance, it can also lead to a performance reduction. When SQL Server starts up, it reserves a quantity of memory for each configured thread. The higher the number of threads, the more memory needs to be reserved. Further, this memory comes from the MemToLeave area, so the configured worker thread count is directly linked to the maximum memory value that can be safely configured. The recommended maximum value for worker threads is 1024 in a 32-bit environment and 2048 in a 64-bit environment. As with all other configuration settings, the best value in almost all cases is the default (0). If you change the value, first verify it for stability in an accurate load-testing environment. Finally, if you re upgrading from SQL Server 2000, the Maximum Worker Threads setting is kept at the SQL 2000 default value of 255. After the upgrade, change this value to 0, which allows SQL Server to determine the appropriate value based on the number and type of CPUs available to the instance.

On servers with a large number of CPUs close to capacity, performance may benefit from enabling fiber mode, also known as lightweight pooling. With this setting in place, SQL Server creates fibers instead of threads. A fiber is a lightweight version of a thread that s able to switch context in user mode rather than kernel mode. Systems experiencing a very high level of context switches per second (>20,000), a value measured using the Windows Performance tool, may experience some performance increase with this option enabled. In chapter 17, we ll cover the measurement

and threshold value for this setting in more detail. Like all configuration options, the Use Windows Fibers (Lightweight Pooling) setting should only be changed from the default value after careful analysis in a testing environment capable of accurately simulating production load.

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Solution: This is a rate problem and an integral is required The stamp is purchased (at t = 0 ) for $5000 Integrate the rate over time wt the limits of 0 and 18 to find the value ih after 18 years

SQL Server can be configured so that threads will only be assigned to particular CPUs. This setting is typically used in NUMA-enabled systems, or on systems used for environments where a certain level of CPU resource needs to be reserved for other purposes, for example, other SQL Server instances or applications, to prevent one SQL Server instance from dominating CPU usage. On single instance servers dedicated to SQL Server, this setting is best left at the default, in which case threads will be balanced across all available CPUs.

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The Processor Affinity option, along with the Fiber Mode, Maximum Worker Threads, and Boost SQL Server Priority settings, can be modified using sp_configure or via the Processors page of the Server Properties window in SQL Server Management Studio, as you can see in figure 7.5.

A commonly altered setting is Maximum Degree of Parallelism (MAXDOP), which controls the maximum number of CPUs that can be used in executing a single task. For example, a large query may be broken up into different parts, with each part executing threads on separate CPUs. Such a query is known as a parallel query.

In 18 years the stamp will be worth $17 1,000

Figure 7.5 The Processors page of the Server Properties window allows changes to CPU configuration settings: CPU Affinity, Maximum Worker Threads, Boost SQL Server Priority, and Use Windows Fibers (Lightweight Pooling).

In a typical OLTP system consisting of lots of short, simple transactions, multiple CPUs are valuable in their ability to service lots of simultaneous threads from multiple users. In contrast, a typical OLAP (reporting/data warehouse) application consists of a smaller number of much larger queries. It follows that splitting up a query into multiple chunks, with each chunk running on a separate CPU, is more suited to an OLAP system whereby large amounts of resources can be used to speed up the execution time of large queries. During query compilation, SQL Server will decide whether to use a parallel query if the MAXDOP setting allows and if the estimated cost of executing the query in a serial manner on a single CPU exceeds a cost threshold. By default, MAXDOP is 0, meaning that SQL Server is left to decide the appropriate number of CPUs to use. You can set this value to 1, effectively disabling parallel queries, or to a specific number that limits the number of CPUs that can be used.

Integral calculus can be used to determine the average values of functions The average value of some quantity that may be varying in a very complicated way can be a valuable piece of information The average value of a function is the area under the curve of that function over a certain range divided by that range The area under the curve is viewed as the area of a rectangle with one dimension equal to the range of the integral and the other dimension, the height equal to the average height to produce the area under the curve

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