| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Vincenzo Romano <vincenzo(dot)romano(at)notorand(dot)it>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: On Scalability |
| Date: | 2010-10-07 07:51:09 |
| Message-ID: | 4CAD7BED.4050009@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
On 07.10.2010 10:41, Simon Riggs wrote:
> On Thu, 2010-10-07 at 10:28 +0300, Heikki Linnakangas wrote:
>
>> constraint exclusion of CHECK constraints on the partitions is
>> exponential
>
> Constraint exclusion is linear with respect to number of partitions.
> Why do you say exponential?
For some reason I thought the planner needs to check the constraints of
the partitions against each other, but you're right, clearly that's not
the case. Linear it is.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Peter Eisentraut | 2010-10-07 09:23:10 | Re: queriing the version of libpq |
| Previous Message | Peter Eisentraut | 2010-10-07 07:48:14 | Re: host name support in pg_hba.conf |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Srikanth K | 2010-10-07 09:37:37 | Re: Optimizing query |
| Previous Message | Simon Riggs | 2010-10-07 07:41:30 | Re: On Scalability |