From: | Shaun Thomas <sthomas(at)optionshouse(dot)com> |
---|---|
To: | Andrew Jaimes <andrewjaimes(at)hotmail(dot)com> |
Cc: | Postgres Performance <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Sequencial scan in a JOIN |
Date: | 2012-06-05 14:02:08 |
Message-ID: | 4FCE1160.4070003@optionshouse.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
On 06/05/2012 08:31 AM, Andrew Jaimes wrote:
> the default_statistics_target is set to 200, and I have run the analyze
> and reindex on these tables before writing the email.
Out of idle curiosity, how do these two variants treat you?
SELECT count(1)
FROM e_usersessions s
JOIN l_userqueue q ON (q.userid = s.entityid)
JOIN a_activity a ON (a.activequeueid = q.queueid)
WHERE s.sessionkeepalivedatetime > 20120605082131943
AND a.vstatus = 1
AND a.ventrydate > 0
AND a.sbuid = s.sbuid
AND a.assignedtoid = 0
AND a.status <> '0'
SELECT count(1)
FROM e_usersessions s
JOIN l_userqueue q ON (q.userid = s.entityid)
WHERE s.sessionkeepalivedatetime > 20120605082131943
AND EXISTS (
SELECT 1 FROM a_activity a
WHERE a.activequeueid = q.queueid
AND a.sbuid = s.sbuid
AND a.vstatus = 1
AND a.ventrydate > 0
AND a.assignedtoid = 0
AND a.status <> '0'
)
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas(at)optionshouse(dot)com
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