| From: | Dimitri Fontaine <dimitri(at)2ndQuadrant(dot)fr> |
|---|---|
| To: | Michal Politowski <mpol+pg(at)meep(dot)pl> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: index in desc order |
| Date: | 2010-11-02 15:23:15 |
| Message-ID: | m262wf3g2k.fsf@2ndQuadrant.fr |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Michal Politowski <mpol+pg(at)meep(dot)pl> writes:
> Cannot there be a (system/hardware) setup where there is a perceptible
> performance difference between forward and backward index scans?
I think it's been reported already that backward index scans indeed can
be much slower than forward index scan, but that how to model that is
still unclear and undone in the cost estimations.
You will have to crawl the pgsql-performance list yourself, though…
Regards,
--
Dimitri Fontaine
http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support
| From | Date | Subject | |
|---|---|---|---|
| Next Message | zhong ming wu | 2010-11-02 15:37:13 | Re: Is this a known feature of 8.1 SSL connection? |
| Previous Message | Dimitri Fontaine | 2010-11-02 15:20:27 | Re: Replication |