On 04/05/2013 03:33 PM, Pete Wall wrote:
Is it possible to downgrade PostgreSQL by a major version?
If I want to upgrade a PG database from 8.x to 9.x, I have to dump the
db, install the new binaries and import the dump file. This works
fine going forward, but what if I need to rollback my changes? I
cannot dump the 9.x database and import it with 8.x binaries, because
the 9.x dump contains keywords that the old binaries don't understand
(e.g. REPLICATION).
I could import the original 8.x dump file again, but then I've lost
any changes made when using the new binaries.
Is there a supported way to downgrade PostgreSQL by major versions?
Is it *possible*? Yes. Assuming that you haven't made use of any
features that are unavailable in the old version or made any changes to
accommodate differences in the new version.
Is there a *supported* way. No. You will need to do roll-your-own. It's
possible that you could do a data-only dump on the new database and get
away with only minor tweaks required to restore the data into an
existing empty prior-version database. The feasibility depends on the
nature of your data and the amount of work you are willing to do.
It might help to understand the use-case underlying your interested in
progressing backward.
Cheers,
Steve
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