Re: Slow query - Mailing list pgsql-performance

Hi David,

We have indexes on all the columns which are used in the where clause and these tables are linked by foreign key
constraint.


Thanks,
Bikram

-----Original Message-----
From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of David
Johnston
Sent: Friday, March 07, 2014 11:53 AM
To: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Slow query

Bikram Kesari Naik wrote
> Hi,
>
> I have a view which joins  multiple tables to give me a result. It
> takes more than a  minute to give me the result on psql prompt when I
> select all the data from that view.
> The single CPU which is used to run this query is utilized 100%.Even
> if I fire a count(*) it takes 10 Sec. I wanted to know if there is
> anything we can do to speedup this query below 1 sec.

In all likelihood you need to index your foreign keys, and possibly other fields, but as you haven't provided table and
indexdefinitions it is hard to say for sure. 

Idepeing on how many rows are hidden I'm not sure an unqualified query on this view can run in 1/60th the time even
withindexes present - the sequential scans are efficient if the proportion of the tables being returned is high. 

David J.





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