On Fri, Apr 5, 2024 at 09:41:05AM +0200, Daniel Gustafsson wrote: > > On 5 Apr 2024, at 06:47, Rama Krishnan <raghuldrag@xxxxxxxxx> 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 <bruce@xxxxxxxxxx> https://momjian.us EDB https://enterprisedb.com Only you can decide what is important to you.
