autovacuum on pg_catalog tables

["Zwettler Markus (OIZ)" <Markus.Zwettler@xxxxxxxxxx>]

I would like to start a more aggressive autovacuum on pg_catalog tables like pg_largeobject.

 

So I tried as a superuser:

 

# alter table pg_catalog.pg_largeobject_metadata set (autovacuum_vacuum_scale_factor = 0, autovacuum_vacuum_threshold = 5000);

ERROR:  permission denied: "pg_largeobject_metadata" is a system catalog

 

(How) Is it possible to change such table attributes on pg_catalog tables?

 

Thanks, Markus