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From: Yaroslav Saburov <[email protected]>
To: David G. Johnston <[email protected]>
Cc: [email protected]
Subject: Re: glossary Data page
Date: Tue, 30 Jun 2026 18:04:53 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwbW-M1nJD2drGYqC3kcbdv7WDDVUP==bqWMczcv6GChyg@mail.gmail.com>
References: <CAKFQuwbW-M1nJD2drGYqC3kcbdv7WDDVUP==bqWMczcv6GChyg@mail.gmail.com>

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 <[email protected]> пише:
> 
> On Sunday, June 28, 2026, PG Doc comments form <[email protected]> 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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