AW: running vacuumlo periodically?

> -----Ursprüngliche Nachricht-----
> Von: Laurenz Albe <laurenz.albe@cybertec.at>
> Gesendet: Donnerstag, 28. Januar 2021 17:39
> An: Zwettler Markus (OIZ) <Markus.Zwettler@zuerich.ch>; pgsql-
> general@postgresql.org
> Betreff: Re: running vacuumlo periodically?
> 
> On Thu, 2021-01-28 at 13:18 +0000, Zwettler Markus (OIZ) wrote:
> > Short question. Is it recommended  - or even best practice – to run vacuumlo
> periodically as a routine maintenance task?
> >
> > We don't do it. I think if this would be recommended it would have been
> implemented as an autotask like autovacuum. No?
> 
> It is recommended to run it regularly if
> - you are using large objects
> - you don't have a trigger in place that deletes large objects that you don't
>   need any more
> 
> Only a small minority of people do that, so it wouldn't make sense to automatically
> run that on all databases.
> 
> Avoid large objects if you can.
> 
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com
[Zwettler Markus (OIZ)] 



We didn't recognize that an application is using large objects and didn't delete them.
Now we found >100G dead large objects within the database. :-(

Is there any _GENERIC_ query which enables monitoring for orphaned objects (dead LO)?

select oid from pg_largeobject_metadata m where not exists
 (select 1 from ANY_EXISTING_TABLE_WITHIN_THE_DATABASE  where m.oid = ANY_COLUMN_CONTAINING_OIDs);

check_postgres.pl doesn't have any generic check for it. :-(


Thanks, Markus