On Sat, Apr 23, 2016 at 8:58 PM, Bruce Momjian <bruce@momjian.us> wrote:
> Why is the parallelism variable called "max_parallel_degree"? Is that a
> descriptive name? What does "degree" mean? Why is it not called
> "max_parallel_workers"?
I also think that "max_parallel_workers" works better.
While certain other systems have a concept of a "maximum parallel
degree", it is not the same. Those other systems disable parallelism
altogether when "max parallel degree" is 1, whereas Postgres uses 1
parallel worker along with a leader process. And so, parallelism
*will* still be used on Postgres. That's a pretty significant
difference.
--
Peter Geoghegan