On Mon, Apr 22, 2024 at 10:25 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
Marcos Pegoraro <marcos@f10.com.br> writes: > But wouldn't it be good that VACUUM FULL uses that index defined by > Cluster, if it exists ?
No ... what would be the difference then?
What the VACUUM docs "should" do, it seems, is suggest CLUSTER on the PK, if the PK is a sequence (whether that be an actual sequence, or a timestamp or something else that grows monotonically).
That's because the data is already roughly in PK order.
If things are bad enough to require a vacuum full that doesn't seem like a good assumption. Any insert-only table or one with a reduced fill-factor maybe.
