Continuous Replication From a Legacy Postgres Version to a Newer Version Using Slony — Native streaming replication in PostgreSQL works only between servers running the same major version, but Slony provides an application-level alternative.
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Interesting Aspects of Logical Replication at a Glance
Converting from Asynchronous to Synchronous Replication in PostgreSQL — Shows you how to install a PostgreSQL...
Performing a Major Version Upgrade with Logical Replication — If you’re just looking to upgrade to...