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Microsoft® SQL Server 2012 Unleashed by Alex T. Silverstein, Chris Gallelli, Paul T. Bertucci, Ray Rankins

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affinity I/O mask

Type: Advanced option; requires a reboot of SQL Server to take effect

Default value: 0

In Windows Servers, multitasking sometimes requires that process threads move among different processors. This type of movement of processing threads can reduce Microsoft SQL Server performance under heavy system loads because each processor cache is repeatedly reloaded with data. Assigning processors to specific threads can improve performance by eliminating processor reloads; such an association between a thread and a processor is called processor affinity. SQL Server 2012 supports processor affinity by means of two affinity mask options: affinity mask (to deal with the processor affinity needs) and affinity I/O mask (to address I/O-related ...

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