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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: Daniel Gustafsson <[email protected]>
Cc: Rama Krishnan <[email protected]>
Cc: Postgres General <[email protected]>
Subject: Re: About postgres pg_upgrade
Date: Sat, 6 Apr 2024 13:41:02 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAJWX+EPcAyaNvEGP-1pS9iUTNWGM3_whENwgP+Sm2-Sc4wUrWA@mail.gmail.com>
<[email protected]>
On Fri, Apr 5, 2024 at 09:41:05AM +0200, Daniel Gustafsson wrote:
> > On 5 Apr 2024, at 06:47, Rama Krishnan <[email protected]> wrote:
>
> > Could you please explain me how does pg_upgrade works one of my friends it works based on pg_restore I am bit confused
>
> The documentation does a fairly good job explaining how it works, and there are
> multiple blogposts and presentations on the subject to be found.
>
> https://www.postgresql.org/docs/devel/pgupgrade.html
>
> To summarize in a few words, pg_upgrade does a dump/restore of the schema from
> the old cluster into the new, but copies the table data. Your friend is thus
> isn't wrong, it does use pg_restore but only for the schema, not the data.
This presentation shows how it works internally:
https://momjian.us/main/writings/pgsql/pg_upgrade.pdf
--
Bruce Momjian <[email protected]> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.
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