From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
---|---|
To: | Robert DiFalco <robert(dot)difalco(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Create one query out of two |
Date: | 2013-08-18 20:23:41 |
Message-ID: | 1376857421.73679.YahooMailNeo@web162906.mail.bf1.yahoo.com |
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Lists: | pgsql-performance |
Robert DiFalco <robert(dot)difalco(at)gmail(dot)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
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