Re: Seq Scan vs. Index Scan

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От
Kevin Grittner
Тема
Re: Seq Scan vs. Index Scan
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4E3A6F6E020000250003FA53@gw.wicourts.gov
Ответ на
Seq Scan vs. Index Scan (Nassib Nassar)
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Seq Scan vs. Index Scan Nassib Nassar <nassar@renci.org>
Re: Seq Scan vs. Index Scan "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
Nassib Nassar  wrote: 
 
> In this example it looks to me like the planner is choosing a Seq
> Scan resulting in 18x running time compared to running it with
> enable_seqscan = 'off'.
 
I would try these settings:
 
random_page_cost = 2
cpu_tuple_cost = 0.02
 
Based on your estimated cost versus actual run times, there's a good
chance they'll better model your environment, and serve you well in
general.
 
-Kevin
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