Zero downtime upgrade PostgreSQL 10 to 11.
PostgreSQL 11 has been officially released and it's packed with exciting changes.Native declarative partitioning is more robust, parallelism is now allowing moreoperations to work in parallel, transactions are now supported in stored procedures and just in time compilation for expressions are just some of the new features. With every major version, Postgres is getting better, providing more and more tools to developers and better quality of life to the DBAs, making it harder to resist an upgrade. That said, while new major versions come with all these exciting improvements, they also come with internal system changes, making the database clusters incompatible across major versions. This means that upgrades up to Postgres 10, where logical replication was introduced, were impossible without downtime or 3rd party replication tools. Story time, Before we get into how to upgrade using logical replication, let's see how upgrading and replication evolved over the years. pg_...