From: Thomas Kellerer <spam_eater@gmx.net>
To: pgsql-admin@lists.postgresql.org
Subject: Re: Regarding postgreSQL performance on DRAM
Date: Wed, 20 Feb 2019 22:50:05 +0100
Message-ID: <1ee47afb-7867-adc6-0df2-c7b1f04f1576@gmx.net> (raw)
In-Reply-To: <29251.1550696663@sss.pgh.pa.us>
References: <CADb0YNk+jYXt6oC3vefFzOigmG8WOCkXmeAq5L8ABA4eMbypHA@mail.gmail.com>
<87va1exlfo.fsf@jsievers.enova.com>
<f37b7ea7-966d-d54a-bf8d-a1c7229e5f8a@gmx.net>
<29251.1550696663@sss.pgh.pa.us>
Tom Lane schrieb am 20.02.2019 um 22:04:
>> Hmm. I though TOAST is only applied to single values, not the entire tuple (row)?
>> As each column is substantially shorter than the TOAST threshold, I would not expect toasting to kick in here.
>
> Well, the entire tuple would be 25600 bytes plus some overhead, which
> cannot fit on a Postgres page (8K, unless the OP changed compile options
> without mentioning it). So something has to be done to make it fit, and
> that something is going to be toasting any fields that can be toasted.
Ah, obviously.
Thanks
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Subject: Re: Regarding postgreSQL performance on DRAM
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