On 03.06.2011 14:02, Alexander Korotkov wrote:
> Hackers,
>
> WIP patch of fast GiST index build is attached. Code is dirty and comments
> are lacking, but it works. Now it is ready for first benchmarks, which
> should prove efficiency of selected technique. It's time to compare fast
> GiST index build with repeat insert build on large enough datasets (datasets
> which don't fit to cache). There are following aims of testing:
> 1) Measure acceleration of index build.
> 2) Measure change in index quality.
> I'm going to do first testing using synthetic datasets. Everybody who have
> interesting real-life datasets for testing are welcome.
I ran another test with a simple table generated with:
CREATE TABLE pointtest (p point);
INSERT INTO pointtest SELECT point(random(), random()) FROM
generate_series(1,50000000);
Generating a gist index with:
CREATE INDEX i_pointtest ON pointtest USING gist (p);
took about 15 hours without the patch, and 2 hours with it. That's quite
dramatic.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com