Message-ID: <49213.192.168.1.32.1047629598.squirrel@mainbox.archonet.com>
In-Reply-To: <c8ae6a4.0303131612.270f150a@posting.google.com>
References: <c8ae6a4.0303131612.270f150a@posting.google.com>
Date: Fri, 14 Mar 2003 08:13:18 -0000 (GMT)
Subject: Re: Poor performance on a right join
From: dev@archonet.com
To: sarloc@jevic.com
Cc: pgsql-sql@postgresql.org
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-1
Importance: Normal

> When doing a join query I am getting a responce time of 3 seconds. The
> callhist table has 66000 rows and the phone table has 10000 rows. I
> have an indexes on callhist.call_date, callhist.operator_id,
> phone.phone, & phone.cust_code. Here's the SQL
> SELECT a.CALL_DATE, a.OPERATOR_ID, a.CUST_CODE FROM PHONE as b right
> join CALLHIST as a on (a.CUST_CODE=b.CUST_CODE) where (b.PHONE =
> '555-555-5555') order by a.call_date desc;
> The postgres db is running on a 2 P3 700 processor server with 1GB of
> ram running Red Hat Linux 7.3. I am running PostgreSQL 7.2.2
>
> Why is the query taking so long? What can I do to help the
> performance?

We'll need the output of EXPLAIN ANALYSE SELECT ...
Perhaps table definitions too.

- Richard Huxton