| From: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Query Optimization |
| Date: | 2010-04-08 14:03:29 |
| Message-ID: | 20100408140329.GD29013@a-kretschmer.de |
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| Lists: | pgsql-performance |
In response to Kaloyan Iliev Iliev :
> Hi,
> Can anyone suggest why this query so slow.
> -> Index Scan using
> ms_commands_history_ms_device_id_idx on ms_commands_history ch
> (cost=0.00..4.33 rows=1 width=8) (actual time=0.163..25254.004 rows=9807
> loops=1)
Estimated rows: 1, actual rows: 9807, that's a BIG difference and,
maybe, your problem.
Btw.: your explain is hard to read (line-wrapping). It's better to
attach the explain as an own file...
Andreas
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Andreas Kretschmer
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