I recently did 20 upgrades from 9.6 to 12.4 and 12.5. No issues and the upgrade process uses pg_upgrade. I don’t know if AWS modified it though. Bob Sent from my PDP11 > On May 28, 2021, at 5:15 PM, Andrew Dunstan <andrew@xxxxxxxxxxxx> wrote: > > >> On 5/28/21 4:23 PM, Jan Wieck wrote: >> On 5/28/21 2:48 PM, Dean Gibson (DB Administrator) wrote: >> >> What sticks out for me are these two scans, which balloon from 50-60 >> heap fetches to 1.5M each. >> >>> -> Nested Loop (cost=0.29..0.68 rows=1 >>> width=7) (actual time=0.003..0.004 rows=1 loops=1487153) >>> Join Filter: ("_IsoCountry".iso_alpha2 = >>> "_Territory".country_id) >>> Rows Removed by Join Filter: 0 >>> -> Index Only Scan using >>> "_IsoCountry_iso_alpha2_key" on "_IsoCountry" (cost=0.14..0.38 >>> rows=1 width=3) (actual time=0.001..0.002 rows=1 loops=1487153) >>> Index Cond: (iso_alpha2 = >>> "_GovtRegion".country_id) >>> Heap Fetches: 1487153 >>> -> Index Only Scan using >>> "_Territory_pkey" on "_Territory" (cost=0.14..0.29 rows=1 width=7) >>> (actual time=0.001..0.001 rows=1 loops=1487153) >>> Index Cond: (territory_id = >>> "_GovtRegion".territory_id) >>> Heap Fetches: 1550706 >> >> How did you load the database? pg_dump -> psql/pg_restore? >> >> If so, did you perform a VACUUM FREEZE after the load? >> >> >> > > Jan > > > AIUI he did an RDS upgrade. Surely that's not doing a dump/restore? I > assume you would know better than him or me what it actually does do :-) > > > cheers > > > andrew > > > -- > Andrew Dunstan > EDB: https://www.enterprisedb.com > > >