| From: | Hengky Liwandouw <hengkyliwandouw(at)gmail(dot)com> |
|---|---|
| To: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
| Cc: | PostgreSQL general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Query runs slow |
| Date: | 2013-11-25 03:07:00 |
| Message-ID: | AF7B7D47-2619-490C-B967-2B5D37D63D4C@gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Dear Kevin,
After reading the link you gave to me, changing shared_buffers to 25% (512MB) of available RAM and effective_cache_size to 1500MB (about 75% of available RAM) make the query runs very fast. Postgres only need 1.8 second to display the result.
Thanks a lot !
On Nov 24, 2013, at 11:21 PM, Kevin Grittner wrote:
> Hengky Lie <hengkyliwandouw(at)gmail(dot)com> wrote:
>
>> this query takes long time to process. It takes around 48 seconds
>> to calculate about 690 thousand record.
>
>> Is there any way to make calculation faster ?
>
> Quite possibly -- that's about 70 microseconds per row, and even
> fairly complex queries can often do better than that. You didn't
> provide enough information to allow people to help you very
> effectively. Please read this page:
>
> http://wiki.postgresql.org/wiki/SlowQueryQuestions
>
> I suggest that you post to the pgsql-performance list with more
> detail, as suggested on that page.
>
> --
> Kevin Grittner
> EDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
| From | Date | Subject | |
|---|---|---|---|
| Next Message | slapo | 2013-11-25 09:02:17 | Re: [GENERAL] Puzzling table scan in a CTE |
| Previous Message | Stephen Frost | 2013-11-25 02:38:05 | Re: GSSAPI authentication with AD |