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From: Stephen Frost <sfrost@snowman.net>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: f.pardi@portavita.eu, postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: PostgreSQL VS MongoDB: a use case comparison
Date: Tue, 20 Nov 2018 14:46:59 -0500
Message-ID: <20181120194659.GJ3415@tamriel.snowman.net> (raw)
In-Reply-To: <CAHyXU0wQ=kVmEY3cq=ZxGxr605Phoaa17+g-Me0T9etUrS1Udg@mail.gmail.com>
References: <d43fd220-09f7-af4c-2623-44f094b15115@portavita.eu>
	<20181119172609.GR3415@tamriel.snowman.net>
	<CAHyXU0wQKaoQsZL=adB5vCFhjL+2kn4DiRnmVDEABJC8aCAz0w@mail.gmail.com>
	<20181120164325.GE3415@tamriel.snowman.net>
	<CAHyXU0yUVXobs=GssyY9soXTDOQX1=r1rt5x5Ek=0hE4pdZoAg@mail.gmail.com>
	<20181120172829.GF3415@tamriel.snowman.net>
	<CAHyXU0wQ=kVmEY3cq=ZxGxr605Phoaa17+g-Me0T9etUrS1Udg@mail.gmail.com>

Greetings,

* Merlin Moncure (mmoncure@gmail.com) wrote:
> On Tue, Nov 20, 2018 at 11:28 AM Stephen Frost <sfrost@snowman.net> wrote:
> > Oh yes, having a dictionary would be a great start to reducing the size
> > of the jsonb data, though it could then become a contention point if
> > there's a lot of new values being inserted and such.  Naturally there
> > would also be a cost to pulling that data back out as well but likely it
> > would be well worth the benefit of not having to store the field names
> > repeatedly.
> 
> Yes, the biggest concern with a shared dictionary ought to be
> concurrency type problems.

Hmmm, I wonder if we could do something like have a dictionary per
page..  Or perhaps based on some hash of the toast ID..  Not sure. :)

Thanks!

Stephen

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