Peter J. Holzer schrieb am 29.10.2021 um 15:43: >> Peter, Oracle instance manages collection of the databases and is ensuring >> recoverabilty using redo logs, which are completely analogous to WAL logs, >> if managed a bit differently. Let's not be nitpicking here. Oracle instance >> is completely analogous to Postgres cluster. If you ask me, the word cluster >> was picked to avoid the word "instance" > > I'm quoting Tom Kyte here: > > | In fact, it is true to say that an instance will mount and open at > | most a single database in its entire lifetime! > > While that article is originally from 2009, it was last changed in 2021, > and I'd trust Tom to change something as fundamental if it wasn't true > anymore. Well, a single "container database" could contain multiple pluggable databases. Except for the "pluggable" part, I consider Oracle's pluggable databases quite similar to Postgres' databases.