Re: AWS forcing PG upgrade from v9.6 a disaster

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