From: Daniel Cristian Cruz <danielcristian@gmail.com>
To: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Not so simple query and a half million loop
Date: Tue, 2 Dec 2008 08:10:14 -0200
Message-ID: <48d0cacb0812020210s22d44b84nc0a6719c97502e87@mail.gmail.com> (raw)
In-Reply-To: <48d0cacb0812010721t783bdcd9g36090504b7070a06@mail.gmail.com>
References: <48d0cacb0812010526i7c51b29fs9319618b3aaf3f49@mail.gmail.com>
<48d0cacb0812010721t783bdcd9g36090504b7070a06@mail.gmail.com>
No one knows why I got "actual time=0.014..0.570 rows=30 loops=511222"
and "actual time=0.005..0.006 rows=1 loops=15158976"?
With:
cu.cal_user_type = 'u' AND
cu.cal_recur_date = COALESCE((SELECT cd.cal_start FROM egw_cal_dates
icd WHERE icd.cal_id = cd.cal_id AND icd.cal_start = cd.cal_start AND
icd.cal_start <> 0), 0)
~ 450 seconds
With
cu.cal_user_type = 'u'
~ 130 ms
With
cu.cal_recur_date = COALESCE((SELECT cd.cal_start FROM egw_cal_dates
icd WHERE icd.cal_id = cd.cal_id AND icd.cal_start = cd.cal_start AND
icd.cal_start <> 0), 0)
~ 1 second
I've tryied to increase statistics to maximum, with no success.
This is the eGroupware database schema, with a few records.
Regards,
2008/12/1 Daniel Cristian Cruz <danielcristian@gmail.com>:
> Maybe someone would like to see it without broken lines (I do).
>
> Regards,
>
> 2008/12/1 Daniel Cristian Cruz <danielcristian@gmail.com>:
>> I've tryied 4 times to post this message to pgsql-performance without
>> success... No return, even an error...
>>
>> Below is my problem; a query that perform bad when using a filter almost equal.
>>
>> ...
>
> --
> Daniel Cristian Cruz
> クルズ クリスチウ３柑ン ダニエル
>
--
Daniel Cristian Cruz
クルズ クリスチウ３柑ン ダニエル
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Subject: Re: Not so simple query and a half million loop
In-Reply-To: <48d0cacb0812020210s22d44b84nc0a6719c97502e87@mail.gmail.com>
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