| From: | Manfred Koizar <mkoi-pg(at)aon(dot)at> |
|---|---|
| To: | pgsql-patches(at)postgresql(dot)org |
| Subject: | cost_nonsequential_access() |
| Date: | 2004-06-08 08:15:21 |
| Message-ID: | gbsac0l2q1j07tc2j9aimavc5o92lp2ifa@email.aon.at |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-patches |
The comment describing cost_nonsequential_access() says that the two
functions "meet in the middle". They meet at random_page_cost/2,
however, not in the middle between 1 and random_page_cost. For
random_page_cost < 2 the result can be less than 1 for relpages near
effective_cache_size. I don't think that this was intended.
This patch makes sure that cost_nonsequential_access() is always between
1 and randon_page_cost and the functions meet a (1+random_page_cost)/2.
Servus
Manfred
| Attachment | Content-Type | Size |
|---|---|---|
| unknown_filename | text/plain | 2.0 KB |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2004-06-08 13:49:22 | Re: Relocatable locale |
| Previous Message | Peter Eisentraut | 2004-06-08 07:55:32 | Re: Relocatable locale |