The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the computing and thread resources that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, you have to configure the max degree of parallelism option appropriately.
When setting up a new SQL Server, I usually use the following code to determine a good starting point for the MAXDOP setting:
I recommend setting MAXDOP to a setting that makes sense for your server load. Only you can determine the best setting for your environment. This script is just a good way to start.