Re: AW: running vacuumlo periodically?

On Thu, 2021-01-28 at 17:03 +0000, Zwettler Markus (OIZ) wrote:
> 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. :-(

You'll have to examine the application and see which tables reference the
large objects. Looking for columns with type "oid" will help.

I recommend that you add an "ON UPDATE OR DELETE" trigger that unlinks
orphaned large objects.

Yours,
Laurenz Albe
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