December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
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Parallel Query Configuration Options
Two server configuration options—maximum degree of parallelism and cost threshold for parallelism—affect the consideration for a parallel query. Although doing so is not recommended, you can change the default settings for each. For single processor machines, these settings are ignored.
The maximum degree of parallelism option limits the number of threads to use in a parallel plan execution. The range of possible values is 0 to 32. This value is configured to 0 by default, which allows the Query Optimizer to use up to the actual number of CPUs allocated to SQL Server. If you want to suppress parallel processing completely, set the value to 1.
The cost threshold for parallelism option establishes a ceiling ...
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