On Wednesday, February 14, 2018, David G. Johnston < david.g.johns...@gmail.com> wrote:
> On Wednesday, February 14, 2018, pavan95 <pavan.postgres...@gmail.com> > wrote: > >> Hi all, >> >> Is it possible to upgrade an existing postgresql 9.1 production system to >> latest Postgres 10.0 version? >> >> The main requirement is to get rid of downtime. Please help me out! >> > > Zero downtime is only possible by standing up a hot-standby then failing > over to it. Same-server upgrade you can do via pg_upgrade but it does > involve downtime. There are lots of material and options online, including > the docs, for setting up hot-standby replication. > > To clarify, you need to use logical replication here since the WAL format is not usable across versions. pg_upgrade is your simplest option if you can handle its downtime. David J.
