From: Joel Reymont <joelr1@gmail.com>
To: Pierre C <lists@peufeu.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: stored proc and inserting hundreds of thousands of rows
Date: Sat, 30 Apr 2011 19:14:31 +0100
Message-ID: <7582830307139292886@unknownmsgid> (raw)
In-Reply-To: <op.vuri6d2keorkce@apollo13>
References: <D5DE36B9-17CF-4A55-9119-CDC0BDC4E48D@gmail.com>
<4DBC004C020000250003D099@gw.wicourts.gov>
<4881277622113933088@unknownmsgid>
<op.vuri6d2keorkce@apollo13>
I'm calculating distance between probability vectors, e.g. topics that
a document belongs to and the topics of an ad.
The distance function is already a C function. Topics are float8[150].
Distance is calculated against all documents in the database so it's
arable scan.
Sent from my comfortable recliner
On 30/04/2011, at 19:04, Pierre C <lists@peufeu.com> wrote:
>
> If you want to search by geographical coordinates, you could use a gist index which can optimize that sort of things (like retrieving all rows which fit in a box).
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To: pgsql-performance@postgresql.org
Cc: joelr1@gmail.com, lists@peufeu.com
Subject: Re: stored proc and inserting hundreds of thousands of rows
In-Reply-To: <7582830307139292886@unknownmsgid>
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