Re: Rename max_parallel_degree?

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От
Tom Lane
Тема
Re: Rename max_parallel_degree?
Дата
Msg-id
2219.1461523373@sss.pgh.pa.us
Ответ на
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Дерево обсуждения
Rename max_parallel_degree? Bruce Momjian <bruce@momjian.us>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Tom Lane <tgl@sss.pgh.pa.us>
Re: Rename max_parallel_degree? Bruce Momjian <bruce@momjian.us>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Geoff Winkless <pgsqladmin@geoff.dj>
Re: Rename max_parallel_degree? Magnus Hagander <magnus@hagander.net>
Re: Rename max_parallel_degree? Tom Lane <tgl@sss.pgh.pa.us>
Re: Rename max_parallel_degree? Alvaro Herrera <alvherre@2ndquadrant.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Tom Lane <tgl@sss.pgh.pa.us>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Peter Geoghegan <pg@heroku.com>
Re: Rename max_parallel_degree? Peter Geoghegan <pg@heroku.com>
Re: Rename max_parallel_degree? Alvaro Herrera <alvherre@2ndquadrant.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Tom Lane <tgl@sss.pgh.pa.us>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Tom Lane <tgl@sss.pgh.pa.us>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Christoph Berg <myon@debian.org>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Amit Kapila <amit.kapila16@gmail.com>
Re: Rename max_parallel_degree? David Rowley <david.rowley@2ndquadrant.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Noah Misch <noah@leadboat.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? "Daniel Verite" <daniel@manitou-mail.org>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? David Rowley <david.rowley@2ndquadrant.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? Magnus Hagander <magnus@hagander.net>
Re: Rename max_parallel_degree? Bruce Momjian <bruce@momjian.us>
Re: Rename max_parallel_degree? "David G. Johnston" <david.g.johnston@gmail.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? "David G. Johnston" <david.g.johnston@gmail.com>
Re: Rename max_parallel_degree? Amit Kapila <amit.kapila16@gmail.com>
Re: Rename max_parallel_degree? Bruce Momjian <bruce@momjian.us>
Re: Rename max_parallel_degree? "Joshua D. Drake" <jd@commandprompt.com>
Re: Rename max_parallel_degree? Robert Haas <robertmhaas@gmail.com>
Re: Rename max_parallel_degree? "Joshua D. Drake" <jd@commandprompt.com>
Re: Rename max_parallel_degree? Gavin Flower <GavinFlower@archidevsys.co.nz>
Re: Rename max_parallel_degree? Peter Geoghegan <pg@bowt.ie>
Re: Rename max_parallel_degree? "Joshua D. Drake" <jd@commandprompt.com>
Magnus Hagander  writes:
> On Sun, Apr 24, 2016 at 8:23 PM, Tom Lane  wrote:
>> FWIW, I agree with Bruce that using "degree" here is a poor choice.
>> It's an unnecessary dependence on technical terminology that many people
>> will not be familiar with.

> FWIW, SQL Server calls it "degree of parallelism" as well (
> https://technet.microsoft.com/en-us/library/ms188611(v=sql.105).aspx). And
> their configuration option is "max degree of parallelism":
> https://technet.microsoft.com/en-us/library/ms181007(v=sql.105).aspx.

Yes, but both they and Oracle appear to consider "degree" to mean the
total number of processors used, not the number of secondary jobs in
addition to the main one.  The only thing worse than employing obscure
technical terminology is employing it incorrectly: that way, you get to
confuse both the users who know what it means and those who don't.

The fact that we couldn't get this right seems to me to be sufficient
evidence that we should stay away from the term "degree".
		regards, tom lane


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