Postgres pg_toast in autovacuum - which table?

Question

I have an autovacuum process running on pg_toast:

select query, from pg_stat_activity where query like '%autov%';
"autovacuum: VACUUM pg_toast.pg_toast_15404513 "

How do I find out what table/index/whatever this pg_toast pertains to? Or is the autovacuum working on something else?

Answer 1

Here's a shorter way:

select 15404513::regclass;

where 15404513 is pg_toast_ suffix.