Thread

Re: WIP: Fast GiST index build

Alexander Korotkov <aekorotkov@gmail.com> — 2011-08-26T14:18:41Z

On Thu, Aug 25, 2011 at 11:08 PM, Heikki Linnakangas <
heikki.linnakangas@enterprisedb.com> wrote:

> Could you share the test scripts, patches and data sets etc. needed to
> reproduce the tests you've been running? I'd like to try them out on a test
> server.
>

1) I've updated links to the datasets on the wiki page.
2) Script for index quality testing fastbuild_test.php is in the attachment.
In order to run it you need PHP with pdo and pdo_pgsql modules. Also
plantuner moduler is required (it is used to force planer to use specific
index). After running that script following query returns relative score of
index quality:

select indexname, avg(count::real/(select count from test_result a2 where
a2.indexname = 'usnoa2_idx3' and a2.predicate = a1.predicate and
a2.tablename = a1.tablename)::real) from test_result a1 where a1.tablename =
'usnoa2' group by indexname;

where 'usnoa2' - table name, 'usnoa2_idx3' - name of index which quality was
assumed to be 1.
3) Patch which makes plantuner work with HEAD is also in attachment.
4) Patch with my split algorithm implementation is attached. Now it's form
is appropriate only for testing purposes.
5) For indexes creation I use simple script which is attached as
'indexes.sql'. Also, similar script with different index names I'm running
with my split patch.

Feel free to ask questions about all this stuff.

------
With best regards,
Alexander Korotkov.