Re: Choosing parallel_degree

On Thu, Mar 17, 2016 at 5:05 AM, Julien Rouhaud <julien(dot)rouhaud(at)dalibo(dot)com>
wrote:

>
> attached v3 drops the GUC part.
>

This looks good good. I do think that some threshold control would be good
in the long term - but you are right Robert it just feels strange.

Maybe once the final formula is implemented in 9.7+ and this gets some real
world use cases it can be revisited?

One thing I really, really like about the way the new patch works is that
you can set parallel_degree on an inheritance parent, then that will set
the minimum workers for all associated children (when accessing from the
parent).

Currently this patch will not fire on small tables even when
parallel_degree is set, can we fix this by adding a check for
ref->parallel_degree to the table size condition?

Cheers,
James

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