On Mon, Sep 18, 2023 at 10:08:30PM +0200, Laurenz Albe wrote: > On Mon, 2023-09-18 at 15:29 +0000, PG Doc comments form wrote: >> My main issue is that `pg_basebackup` page does not mention that this backup >> is compatible only with current version of database. I can not do basebackup >> on v11 and restore that on v15, for example. > > I think that that is amply documented by the fact that pg_basebackup is > *not* mentioned in https://www.postgresql.org/docs/current/upgrading.html .
Yeah. The issue with this one is that it does a direct physical copy of the files. You cannot expect pg_basebackup to be able to do all the work that pg_upgrade would do underground, like binary upgrades, and more. > You can't expect us to enumerate every tool that is not suitable for > upgrading. Just noting in passing. There is a lot of maintenance effort for downward compatibility (tools like pg_dump and pg_basebackup at version N are able to work with a backend version older, say at N-1). Upward compabitility may work in some cases, even for dumps, still these would likely require extra manipulation to be able to load to a version of the backend older than the version of pg_dump used. Being able to use pg_basebackup to work with older backend versions is a really important property we try to keep available. -- Michael
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