From: Kevin Grittner <kgrittn@ymail.com>
To: Robert DiFalco <robert.difalco@gmail.com>
To: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Create one query out of two
Date: Sun, 18 Aug 2013 13:23:41 -0700 (PDT)
Message-ID: <1376857421.73679.YahooMailNeo@web162906.mail.bf1.yahoo.com> (raw)
In-Reply-To: <CAAXGW-zQhcidwZRhgsmmECOtNQQJm8xXwsjVq0vi2Wa5iUMeTA@mail.gmail.com>
References: <CAAXGW-zQhcidwZRhgsmmECOtNQQJm8xXwsjVq0vi2Wa5iUMeTA@mail.gmail.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-performance>
Robert DiFalco <robert.difalco@gmail.com> wrote:>
> UPDATE contacts SET user_id = u.id
> FROM my_users u
> JOIN phone_numbers pn ON u.phone_significant = pn.significant
> WHERE contacts.owner_id = 7 AND contacts.user_id IS NULL
> AND contacts.id = pn.ref_contact_id;
>
> UPDATE contacts SET user_id = u.id
> FROM my_users u
> JOIN email_addresses em ON u.email = em.email
> WHERE contacts.owner_id = 7 AND contacts.user_id IS NULL
> AND contacts.id = em.ref_contact_id;
>
> They are running slower than I'd like them to even though I have
> indices on user_id, owner_id, email, and significant.
Have you tried those queries with an index like this?:
CREATE INDEX contacts_owner_null_user
ON contacts (owner_id)
WHERE user_id IS NULL;
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: kgrittn@ymail.com, robert.difalco@gmail.com
Subject: Re: Create one query out of two
In-Reply-To: <1376857421.73679.YahooMailNeo@web162906.mail.bf1.yahoo.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox