| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Martin Weinberg <weinberg(at)osprey(dot)astro(dot)umass(dot)edu> |
| Cc: | Martijn van Oosterhout <kleptog(at)svana(dot)org>, "Martin D(dot) Weinberg" <weinberg(at)astro(dot)umass(dot)edu>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: multi-column btree index for real values |
| Date: | 2002-10-05 18:30:47 |
| Message-ID: | 200210051830.g95IUlW06080@candle.pha.pa.us |
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| Lists: | pgsql-general |
Martin Weinberg wrote:
> Martijn,
>
> Thanks. So that implies that a multidimensional btree index is
> useless for two columns of floats (one will probably always
> be searching on the first index for a tree of large height).
>
> Let me restate my question as an example. Supose I have columns
> of longitude and latitude. What is the best indexing strategy to
> find all tuples with in a two dimensional bound of longitude and
> latitude. E.g. with where clause
>
> lat between 21.49 and 37.41 and
Oh, rtree. That is exactly the index type you want.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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