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> E.1.2. Migration to Version 10

> A dump/restore using pg_dumpall, or use of pg_upgrade, is. > required for those wishing to migrate data from any previous > release. (https://www.postgresql.org/docs/devel/static/release-10.html) This means no, I guess. This is what I don't get. How can anyone with a sizeable db in production do that?

That is only if you want to upgrade in-place. Upgrading using logical replication is different: it requires running another instance and switching over to it when all the data has been replicated.

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