Re: [PERFORM] query problem - Mailing list pgsql-general

From Robin Ericsson
Subject Re: [PERFORM] query problem
Date
Msg-id 1097684840.24018.133.camel@pylver.localhost.nu.
Whole thread Raw
Responses Re: [PERFORM] query problem
List pgsql-general
On Wed, 2004-10-13 at 18:01 +0200, Robin Ericsson wrote:
> Using exact timestamp makes the query go back as it should in speed (see
> explain below). However I still have the problem using a stored
> procedure or even using the "ago"-example from above.

Well, changing ago() to use timestamp without time zone it goes ok in
the query. This query now takes ~2ms.

SELECT
        data.entered,
        data.machine_id,
        datatemplate_intervals.template_id,
        data_values.value
FROM
        data, data_values, datatemplate_intervals
WHERE
        datatemplate_intervals.id = data_values.template_id AND
        data_values.data_id = data.id AND
        data.machine_id IN (SELECT machine_id FROM machine_group_xref
WHERE group_id = 1) AND
        ago('60 seconds') < data.entered

Using it in this procedure.
select * from get_current_machine_status('60 seconds', 1);
takes ~100s. Maybe there's some obvious wrong I do about it?

CREATE TYPE public.mstatus_holder AS
   (entered timestamp,
    machine_id int4,
    template_id int4,
    value varchar);
CREATE OR REPLACE FUNCTION public.get_current_machine_status(interval,
int4)
  RETURNS SETOF mstatus_holder AS
'
    SELECT
        data.entered,
        data.machine_id,
        datatemplate_intervals.template_id,
        data_values.value
    FROM
        data, data_values, datatemplate_intervals
    WHERE
        datatemplate_intervals.id = data_values.template_id AND
        data_values.data_id = data.id AND
        data.machine_id IN (SELECT machine_id FROM machine_group_xref WHERE
group_id = $2) AND
        ago($1) < data.entered
'
  LANGUAGE 'sql' VOLATILE;


Regards,
    Robin



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