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Is there any documentation on explain? - Mailing list pgsql-general

From Diogo Biazus
Subject Is there any documentation on explain?
Date
Msg-id 3DA2CE57.7060308@ikono.com.br
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Responses Re: Is there any documentation on explain?  (Bruce Momjian <pgman@candle.pha.pa.us>)
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Hi everybody,

I have some questions about the results in explain.
I don't know exactly what's the diference between "merge join" and "hash
join", wich one is faster?
What is the meaning of the cost number?
Is there any documentation about this?

Thanks in advance,

--
Diogo de Oliveira Biazus
diogo@ikono.com.br
Ikono Sistemas e Automação
http://www.ikono.com.br

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