autovacuum on system catalog

[Artem Tomyuk <admin@xxxxxxxxxxxxxx>]

Hi.

Why its not possible to set autovacuum settings on pg_attribute?

alter table pg_attribute set (autovacuum_vacuum_scale_factor = 0.0);

alter table pg_attribute set (autovacuum_vacuum_threshold = 500);

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

********** Ошибка **********

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

SQL-состояние: 42501