Try to understand VACUUM and its settings

Hi,

Last Friday, I ran :

postgres=# select max(age(datfrozenxid)) from pg_database;

max
42579490

and then I ran :

SELECT relname, age(relfrozenxid) as xid_age,
pg_size_pretty(pg_table_size(oid)) as table_size
FROM pg_class
WHERE relkind = 'r' and pg_table_size(oid) > 1073741824
ORDER BY age(relfrozenxid) DESC LIMIT 20;

"table_1";42574012;"10111 MB"
"table_2";42567398;"5961 MB"
"table_3";20320509;"12 GB"

Today, the max is

43068744

and

"table_1";43063214;"10134 MB"
"table_2";43056600;"5984 MB"
"table_3";20809711;"12 GB"

====

It looks like the age(relfrozenxid) of the tables go up in tandem with the
max. autovacuum_freeze_max_age and vacuum_freeze_table_age are commented
out in postgresql.conf

#autovacuum_freeze_max_age = 200000000
#vacuum_freeze_table_age = 150000000

So, do I need to run vacuum freeze on those tables? Also, if
autovacuum_freeze_max_age is commented, does it still mean that the default
is 200M?

Thanks,
Michael