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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: [email protected] <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: glossary Data page
Date: Tue, 30 Jun 2026 06:28:39 -0700
Message-ID: <CAKFQuwbW-M1nJD2drGYqC3kcbdv7WDDVUP==bqWMczcv6GChyg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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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Subject: Re: glossary Data page
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