Re: About postgres pg_upgrade

> On 5 Apr 2024, at 06:47, Rama Krishnan <raghuldrag@gmail.com> 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.

--
Daniel Gustafsson