Re: Restore of a reference database kills the auto analyze processing.

On 5/16/24 08:59, HORDER Philip wrote:
> Classified as: {OPEN}
>
> Adrian,
>
>> Still your contention was that autovacuum quit running after the initial restore and that is not the case....
>
> This Postgres server has been restarted a few times since 2nd May most recently on Tuesday 14th, hence the more recent analyze status.

Assuming clean shutdowns the statistics will survive restarts. They
would be wiped when you drop a database and start over, have an unclean
shutdown or you use one of the reset functions from here:

https://www.postgresql.org/docs/current/monitoring-stats.html#MONITORING-STATS-FUNCTIONS

28.2.25. Statistics Functions

>
> We've had some problems with our data feeds on this integration system, but these are now running again.
> I'm planning to leave it all alone until I'm back in the office on Tuesday, and run this query again for a few tables and send you an update.
> I'm expecting no further stats analysis, (and the performance to be appalling).

From here:

https://www.postgresql.org/docs/current/runtime-config-logging.html

log_autovacuum_min_duration

In addition, when this parameter is set to any value other than -1, a
message will be logged if an autovacuum action is skipped due to a
conflicting lock or a concurrently dropped relation.

>
> Thanks for your time.
>
> Phil Horder
> Database Mechanic
>
> Thales
> Land & Air Systems
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com