Re: glossary Data page

From: Yaroslav Saburov <y(dot)saburov(at)gmail(dot)com>
To: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
Cc: pgsql-docs(at)lists(dot)postgresql(dot)org
Subject: Re: glossary Data page
Date: 2026-06-30 15:04:53
Message-ID: B6F86329-C537-455B-801F-5DB272C1D98A@gmail.com
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Maybe these are just the intricacies of translation.
This is how I interpret it:

1) All pages are the same size.
2) Data pages are usually stored on disk,
3) each in a separate file,

> 1) All pages are of the same size.
> 2) Data pages are typically stored on disk
> 3) each in a specific file,

> 30 черв. 2026 р. о 16:28 David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> пише:
>
> On Sunday, June 28, 2026, PG Doc comments form <noreply(at)postgresql(dot)org> wrote:
>> The following documentation comment has been logged on the website:
>>
>> Page: https://www.postgresql.org/docs/18/glossary.html
>> Description:
>>
>> > The basic structure used to store relation data. All pages are of the same
>> size. Data pages are typically stored on disk, each in a specific file, and
>> can be read to shared buffers where they can be modified, becoming dirty.
>> They become clean when written to disk. New pages, which initially exist in
>> memory only, are also dirty until written.
>>
>> Am I correct in understanding from this description that all files on the
>> disk will be the same size?
>> One page = one file?
>
> No. A page is an atomic unit subset of a file. Files contain many pages. It would be crazy to limit file sizes to 8kb when we have GB available.
>
> David J.

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