From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Daniel Cristian Cruz <danielcristian(at)gmail(dot)com> |
Cc: | pgsql-admin <pgsql-admin(at)postgresql(dot)org> |
Subject: | Re: Not so simple query and a half million loop |
Date: | 2008-12-02 16:07:37 |
Message-ID: | 20081202160737.GJ5672@alvh.no-ip.org |
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Lists: | pgsql-admin pgsql-performance |
Daniel Cristian Cruz escribió:
> 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
I don't know, but why are you using such an expression instead of an
outer join?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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