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 analyse about 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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