When you need to upgrade your PostgreSQL databases, there are a number of options available to you. In this post well take a look at how you can upgrade PostgreSQL versions using pg_upgrade, a built-in tool that allows in-place upgrade of your software. Using pg_upgrade allows you, potentially, to minimize your downtime, an essential consideration [&]

https://www.percona.com/blog/2019/04/12/fast-upgrade-of-legacy-postgresql-with-minimum-downtime-using-pg_upgrade/