On Fri, Jun 14, 2024 at 2:20 AM Shenavai, Manuel <manuel.shenavai@xxxxxxx> wrote:
Hi everyone,
I would like to configure the autovacuum in a way that it runs very frequently (i.e. after each update-statement). I tried the following settings on my table:
alter table mytable set (autovacuum_vacuum_scale_factor = 0.0);
alter table mytable set (autovacuum_vacuum_cost_delay = 0.0);
alter table mytable set (autovacuum_vacuum_cost_limit = 10000);
alter table mytable set (autovacuum_vacuum_threshold = 1);
I do a lot of updates on a single tuple and I would expect that the autovacuum would start basically after each update (due to autovacuum_vacuum_threshold=1). But the autovacuum is not running.
HOT is probably what you're looking for: https://www.postgresql.org/docs/14/storage-hot.html
Presuming that the field you're updating is not indexed, and the table can be exclusively locked for as long as it takes to rewrite it: give the table "more space to work" in each page:
ALTER TABLE foo SET (fillfactor = 30);
VACUUM FULL foo;
Then you don't need to VACUUM soooo frequently.
