InterSystems FAQ rubric
One way to optimize query performance is to use query parallelism on a per-query or system-wide basis (a standard feature).
This is a technique for dividing the execution of a particular query among processors on a multi-processor system. The query optimizer will execute parallel processing only if there is a possibility of benefiting from parallel processing. Parallel processing is only applicable to SELECT statements.
Note that the number of parallel processes cannot be specified, as it is automatically adjusted according to the number of CPUs.




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