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Editorial Team
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Asked: 2026-06-17T08:46:27+00:00

I’m having a problem with the system being overloaded. The query below is getting

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I’m having a problem with the system being overloaded.
The query below is getting data from 3 tables, 2 of them have more than 10.000 records, and it takes 50 seconds to run. 

SELECT DISTINCT
p.prod_name,
p.prod_price,
Sum(dt.vt_qtd) as total_qtd

FROM tdb_products p 
LEFT JOIN tdb_sales_temp dt ON p.prod_mp_id = dt.vt_product
LEFT JOIN tdb_sales s ON dt.vt_cupom = s.sl_coupom

WHERE
s.sl_day = $day_link AND
s.sl_mon = $mon_link AND
s.sl_year = $year_link

GROUP BY
p.prod_name

ORDER BY
p.prod_name ASC

Is this normal?

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1 Answer

  1. Editorial Team

    Short answer is no, that is definitely not an okay length of time. Any common database system should be able to handle multiple 10,000 row tables with sub-second time.

    Not knowing the full schema or dbms back end, my recommendations to look at would be:

    Indexing – make sure that the columns being used in the joins have proper indexes on them
    Data Type – if there is a difference in data type on the columns being joined, the dbms will have to perform a conversion for each row connection which could lead to significant performance drain.

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