On 5/7/24 02:38, HORDER Philip wrote:
> Thanks for your time Adrian
>
>
>> Is there enough data processing?
>
> Yes, one table is receiving upwards of 20 million rows daily.
> We noticed the problem when fetch performance on this table degraded after updates.
>
>> Autovacuum has thresholds for turning on, are you sure those thresholds are just not being met?
>
> Yes we're sure. Our biggest table is set for a fixed number of rows rather than a percentage, this gets an auto
analyseabout every 15 minutes.
>
> After an update this just stops, and there are no analyse entries in the log file. None at all, for any table.
1) What is the exact pg_restore command you are using?
2) From earlier post: '... only analyzes tables in the new db at the
point of reload, then shuts off again.' Provide that sequence of events
from the Postgres log.
3) Also statistics from
https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-PG-STAT-ALL-TABLES-VIEW
for that table after the reload.
>
> When we restart Postgres the auto analyse restarts and catches up with the backlog.
>
>
> Phil Horder
> Database Mechanic
>
> Thales
> Land & Air Systems
>
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Adrian Klaver
adrian.klaver@aklaver.com