On Wed, Aug 9, 2023 at 6:18 AM Tom Lane <t...@sss.pgh.pa.us> wrote: > Perhaps, though, there's a case for forcing all pages to be visited > if we start with reltuples == -1? I'm not sure it matters much > though given that you also need an ANALYZE run to be really in a > good place after pg_upgrade. The ANALYZE should update this.
Right. VACUUM is sometimes much less efficient than just using ANALYZE to establish an initial reltuples. Other times it is much less accurate. I can't see any argument for opting to use VACUUM instead of ANALYZE after an upgrade. -- Peter Geoghegan
