From: sverhagen <sverhagen@wps-nl.com>
To: pgsql-performance@postgresql.org
Subject: Re: Performance trouble finding records through related records
Date: Thu, 3 Mar 2011 01:19:20 -0800 (PST)
Message-ID: <1299143960277-3407689.post@n5.nabble.com> (raw)
In-Reply-To: <4D6F054A.2090208@squeakycode.net>
References: <1299024855300-3405914.post@n5.nabble.com>
<4D6DBC63.7080109@squeakycode.net>
<1299111156142-3407330.post@n5.nabble.com>
<4D6F054A.2090208@squeakycode.net>
Andy Colson wrote:
>
> For your query, I think a join would be the best bet, can we see its
> explain analyze?
>
Here is a few variations:
SELECT events_events.* FROM events_events WHERE transactionid IN (
SELECT transactionid FROM events_eventdetails customerDetails
WHERE customerDetails.keyname='customer_id'
AND substring(customerDetails.value,0,32)='1957'
AND transactionid IS NOT NULL
) ORDER BY id LIMIT 50;
-- http://explain.depesz.com/s/Pnb
explain analyze SELECT events_events.* FROM events_events,
events_eventdetails customerDetails
WHERE events_events.transactionid = customerDetails.transactionid
AND customerDetails.keyname='customer_id'
AND substring(customerDetails.value,0,32)='1957'
AND customerDetails.transactionid IS NOT NULL
ORDER BY id LIMIT 50;
-- http://explain.depesz.com/s/rDh
explain analyze SELECT events_events.* FROM events_events
JOIN events_eventdetails customerDetails
ON events_events.transactionid = customerDetails.transactionid
AND customerDetails.keyname='customer_id'
AND substring(customerDetails.value,0,32)='1957'
AND customerDetails.transactionid IS NOT NULL
ORDER BY id LIMIT 50;
-- http://explain.depesz.com/s/6aB
Thanks for your efforts!
--
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To: pgsql-performance@postgresql.org
Cc: sverhagen@wps-nl.com
Subject: Re: Performance trouble finding records through related records
In-Reply-To: <1299143960277-3407689.post@n5.nabble.com>
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