On Wed, Feb 1, 2023 at 11:15 AM Dimitrios Apostolou <ji...@gmx.net> wrote:
> On Tue, 31 Jan 2023, David G. Johnston wrote: > > > > It feels like there is room for improvement here using table statistics > and the visibility map to significantly reduce the number of pages > retrieved that turn out to be all dead. > > Yes, I too wish postgres was more clever for a simple unordered query. I > should also mention that this table has two btree indices, one primary key > index and one on another column. Would it be feasible to "descend" an > index in order to immediately find some live data? > That isn't possible since indexes don't have tuple visibility information within them; most of the dead bloat entries present in the table have dead bloat entries pointing to them in the index. David J.
