Re: Query runs slow

Dear Kevin,

After reading the link you gave to me, changing shared_buffers to 25% (512MB) of available RAM and effective_cache_size
to1500MB (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@gmail.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