below <varname>autovacuum_freeze_max_age</>, leaving enough gap so that

a regularly scheduled <command>VACUUM</> or an autovacuum triggered by

normal delete and update activity is run in that window. Setting it too

close could lead to autovacuums totoshrink <literal>pg_clog</> and

close could lead to autovacuums to shrink <literal>pg_clog</> and

<literal>pg_multixact</>, even though the table

was recently vacuumed to reclaim space, whereas lower values lead to more

frequent aggressive vacuuming.