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The Cost Threshold for Parallelism option dynamically controls the threshold at which SQL Server starts to consider parallel execution plans over serial execution plans. Parallel execution plans take longer to work out but execute more quickly on multi-processor servers. It does not apply to a uniprocessor server.The default value of five seconds indicates that SQL Server should use a parallel execution plan when it estimates that a serial plan will take longer than that threshold to execute on a specific hardware configuration. The Cost Threshold for Parallelism option is considered a fine-tuning mechanism and typically left alone.
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The Lightweight Pooling Option
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The Lightweight Pooling option controls whether SQL Server switches to fiber mode scheduling. A fiber is a lightweight thread that requires fewer processor resources because it avoids the need for context switching. The Lightweight Pooling option may reduce the system overhead associated with execessive context switching sometimes experienced in multiprocessor servers. Reconfiguring the Lightweight Pooling option requires you to restart the SQL Server instance. Be careful with the lightweight pooling option because certain SQL Server 2005 components, such as the Common Language Runtime (CLR), are not supported under lightweight pooling. You should consider evaluating the need of using the Lightweight Pooling option only if you are experiencing both high processor utilization and excessive context switching. You should monitor your SQL Server solution using System Monitor both before and after changing the Lightweight Pooling option to determine whether it is appropriate. Important Microsoft has rewritten the way SQL Server 2005 works in fiber mode scheduling. The lightweight pooling option is not supported on Windows 2000 and Windows XP.
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The Locks option controls the amount of memory allocated by SQL Server for managing locks; each lock consumes 96 bytes. The default value of zero allows SQL Server to dynamically allocate and deallocate memory used for managing locks. This dynamic lock pool does not exceed 60 percent of the memory allocated to the SQL Server instance. The Locks option also controls lock escalation. Reconfiguring the Locks option requires you to restart the SQL Server instance. The Locks option is typically left alone and considered a fine-tuning mechanism. Consider changing the locks option if your SQL Server instance is generating lock errors.
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The Max Server Memory option dynamically controls the upper limit of the amount of memory (in MB) that the SQL Server instance s buffer pool uses. The default value of zero allows the SQL Server instance to respond to external memory pressure and dynamically uses up to all of the available memory. The Max Server Memory option is typically used as a fine-tuning mechanism where you have a multi-instance cluster, multiple instances of SQL Server, or other software running on your SQL Server solution, where you want to limit the amount of memory your SQL Server instance consumes.
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29
Database System Tuning
The Max Degree of Parallelism Option
The Max Degree of Parallelism option dynamically controls the number of processors the SQL Server instance uses for parallel execution plans. You can set the max degree of parallelism to one to prevent SQL Server from using parallel execution plans. The default value of zero uses all of the available processors, both physical and logical, taking into account the affinity mask setting. The Max Degree of Parallelism option is typically used as a fine-tuning mechanism where you have a multi-instance cluster or multiple instances of SQL Server. It is recommended that you adjust the Max Degree of Parallelism option to match the number of physical processors in a hyperthreaded environment for optimal performance. Note
Queries can override the max degree of parallelism option through the MAXDOP optimizer hint, which specifies the maximum number of processors that can be used for parallelism, when creating the query execution plan. For more information on the MAXDOP optimizer hint see Query Hint (Transact-SQL) topic in SQL Server 2005 Books Online.
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