From: Yonatan Ben-Nes <da@canaan.co.il>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Cristian Prieto <cristian@clickdiario.com>
Cc: Sean Davis <sdavis2@mail.nih.gov>
Cc: pgsql-general@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: Index use in BETWEEN statement...
Date: Tue, 27 Sep 2005 13:45:41 +0200
Message-ID: <433930E5.7090800@canaan.co.il> (raw)
In-Reply-To: <1896.1127762243@sss.pgh.pa.us>
References: <20050926175615.BA5C21015A@mail.clickdiario.com>
<1896.1127762243@sss.pgh.pa.us>
Tom Lane wrote:
> "Cristian Prieto" <cristian@clickdiario.com> writes:
>
>>mydb=# explain analyze select locid from geoip_block where
>>'216.230.158.50'::inet between start_block and end_block;
>
>
>>As you see it still using a sequential scan in the table and ignores the
>>index, any other suggestion?
>
>
> That two-column index is entirely useless for this query; in fact btree
> indexes of any sort are pretty useless. You really need some sort of
> multidimensional index type like rtree or gist. There was discussion
> just a week or three ago of how to optimize searches for intervals
> overlapping a specified point, which is identical to your problem.
> Can't remember if the question was about timestamp intervals or plain
> intervals, but try checking the list archives.
>
> regards, tom lane
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
>
> http://archives.postgresql.org
I think that Tom is talking about a discussion which I started entitled
"Planner create a slow plan without an available index" search for it
maybe it will help you.
At the end I created an RTREE index and it did solved my problem though
my data was 2 INT fields and not INET fields as yours so im not sure how
can you work with that... To solve my problem I created boxes from the 2
numbers and with them I did overlapping.
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To: pgsql-performance@postgresql.org
Cc: da@canaan.co.il, tgl@sss.pgh.pa.us, cristian@clickdiario.com, sdavis2@mail.nih.gov, pgsql-general@postgresql.org
Subject: Re: Index use in BETWEEN statement...
In-Reply-To: <433930E5.7090800@canaan.co.il>
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