Zeugswetter Andreas OSB sIT <Andreas.Zeugswetter@s-itsolutions.at> writes:
> I am still answering here because my question was related to upgrade.
> I think you need to turn off autovacuum before freezing to avoid a later analyze
> that unfreezes pg_class (or the stats table).
vacuum analyze doesn't unfreeze pg_class. It could create unfrozen
tuples in pg_statistic, perhaps, but we could easily fix that by
truncating pg_statistic afterwards (its not like there will be useful
data there...)
The end goal is going to be to have all this work happen in a standalone
backend, rather than risk firing up the postmaster while the database is
in an unstable state. So I would counsel spending as little effort as
possible on filing off rough edges that are related to the
using-a-postmaster scenario.
regards, tom lane