Re: multi-key index

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От Bruce Momjian
Тема Re: multi-key index
Дата
Msg-id 200412201803.iBKI35J03818@candle.pha.pa.us
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Ответ на multi-key index  (Jaime Casanova <systemguards@yahoo.com>)
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Jaime Casanova wrote:
> Hi everyone,
> 
> >From the TODO items:
> Use index to restrict rows returned by multi-key index
> when used with non-consecutive keys to reduce heap
> accesses.
> For an index on col1,col2,col3, and a WHERE clause of
> col1 = 5 and col3 = 9, spin though the index checking
> for col1 and col3 matches, rather than just col1; also
> called skip-scanning. 
> 
> 
> I was looking in the archives something about this but
> i found nothing. Where can i found the thread (i
> suppose should be one) about this issue?

I don't remember any detailed discussion on it except that it would be a
good idea.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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