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help / color / mirror / Atom feedFrom: Tim Schwenke <[email protected]>
To: David G. Johnston <[email protected]>
Cc: Pgsql Novice <[email protected]>
Subject: Re: Does PostgreSQL cache all columns of a table after SELECT?
Date: Mon, 05 Jun 2023 17:15:24 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwa-KCHhYi5Z5LKBK+H2H84G7S-dZVqZy-AH3gRUanexnA@mail.gmail.com>
References: <[email protected]>
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Thanks, you all helped me
---- On Mon, 05 Jun 2023 16:26:08 +0200 David G. Johnston <[email protected]> wrote ---
On Mon, Jun 5, 2023, 06:17 Tim Schwenke <mailto:[email protected]> wrote:
Hello David,
from what I understand, in PostgreSQL, tables are stored in one or more files called segments. There is no separation by columns.
https://www.postgresql.org/docs/8.1/storage.html
This means if I select a single column from a table the first time, the full file / segment is read and put into page cache if there is enough space.
Pages are subsegment.
You may also wish to take care to notice the version of documentation pages you look at and reference. 8.1 is long past its expiration date.
David J.
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