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Thanks for sharing this. Really interesting. But a basic question, why not upgrading to PG 13 instead? I am curious about the reasons for staying on an older version of PostgreSQL.

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I see it now that it's a 2018 article. Makes sense!

Interesting. Does PG13 let then do this without downtime?

Not from 9.4, but now there is a path using logical replication between versions: https://www.percona.com/blog/2019/04/04/replication-between-...

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