On 12/12/19 1:35 PM, Mark Dilger wrote:
> Let C = 1.00000002065
> Let x = xid_age for a table
> Let v = clamp(n_dead_tuples / reltuples*2) to max 0.5
> Let a = clamp(changes_since_analyze / reltuples) to max 0.5
>
> Let score = C**x + v + a
I should hasten to add that this is just a proof of concept
formula, not one that I'm specifically advocating. The point
is that we can devise a scoring system in which the xid age
is the dominant factor whenever it could possibly matter,
while still letting other factors prevail when xid age is
of little consequence.
--
Mark Dilger
