From: Drew Wilson <drewmwilson@gmail.com>
To: Daniel Cristian Cruz <danielcristian@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Many to many join seems slow?
Date: Tue, 15 May 2007 09:43:55 -0700
Message-ID: <694A96DF-65A7-4DCD-972F-97081A554E1B@gmail.com> (raw)
In-Reply-To: <48d0cacb0705150900o29f11b42t5dc5634be50e496a@mail.gmail.com>
References: <49735678-25F5-48AA-B464-0864BAE56B55@gmail.com>
<48d0cacb0705150900o29f11b42t5dc5634be50e496a@mail.gmail.com>
Yes, I'll be filtering by string value. However, I just wanted to see
how long it takes to scan all translations in a particular language.
Drew
On May 15, 2007, at 9:00 AM, Daniel Cristian Cruz wrote:
> 2007/5/15, Drew Wilson <drewmwilson@gmail.com>:
>> =# explain SELECT s.source_id, s.value AS sourceValue, t.value AS
>> translationValue
>> FROM
>> source s,
>> translation_pair tp,
>> translation t,
>> language l
>> WHERE
>> s.source_id = tp.source_id
>> AND tp.translation_id = t.translation_id
>> AND t.language_id = l.language_id
>> AND l.name = 'French' ;
>>
>> QUERY PLAN
>> ---------------------------------------------------------------------
>> ---
>> -----------------------------------------------------
>> Merge Join (cost=524224.49..732216.29 rows=92447 width=97)
>
> This way you get all word matches for the French language. Shouldn't
> it be all matches for a specific word (s.value = 'word' in WHERE)?
>
> --
> Daniel Cristian Cruz
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To: pgsql-performance@postgresql.org
Cc: drewmwilson@gmail.com, danielcristian@gmail.com
Subject: Re: Many to many join seems slow?
In-Reply-To: <694A96DF-65A7-4DCD-972F-97081A554E1B@gmail.com>
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