| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | "y(dot)saburov(at)gmail(dot)com" <y(dot)saburov(at)gmail(dot)com>, "pgsql-docs(at)lists(dot)postgresql(dot)org" <pgsql-docs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: glossary Data page |
| Date: | 2026-06-30 13:28:39 |
| Message-ID: | CAKFQuwbW-M1nJD2drGYqC3kcbdv7WDDVUP==bqWMczcv6GChyg@mail.gmail.com |
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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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