On Fri, 2024-06-14 at 06:20 +0000, Shenavai, Manuel wrote: > 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. > > Is it possible to configure postgres to autovacuum very aggressively > (i.e. after each update-statement)? The formula in the source code is /* Determine if this table needs vacuum or analyze. */ *dovacuum = force_vacuum || (vactuples > vacthresh) || (vac_ins_base_thresh >= 0 && instuples > vacinsthresh); So you need to update at least two rows to exceed the threshold. If you want a single update to trigger autovacuum, you have to set "autovacuum_vacuum_threshold" to 0. I cannot imagine a situation where such a setting would be beneficial. Particularly if you have lots of updates, this will just burn server resources and may starve out other tables that need VACUUM. Yours, Laurenz Albe