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MySQL starts automatically strange "SELECT * FROM a JOIN b USING" query
Posted by: Maxim Shchetynin
Date: February 21, 2012 12:15PM

Hello,

I have migrated my Joomla/VirtueMart shop to a new Virtuemart 2.0.0. In this version of VirtueMart a table of products is splitted into two (at least) tables called `joomla_virtuemart_products` and `joomla_virtuemart_products_de_de`. After this migration I noticed periodical heavy performance degradation. After a short investigation I have mentioned that MySQL starts approx. every one minute the following SQL-query (I can see it in a list of MySQL-processes):

SELECT *
FROM `joomla_virtuemart_products_de_de` AS l
JOIN `joomla_virtuemart_products` AS p
USING

I have checked source codes of both Joomla and VirtueMart and did not found anything which could produce such kind of query.

This query causes me a pretty big problem because my products tables have entries for about 200000 products, therefore when this query starts it makes my shop almost unaccessible for about 20-30 seconds, and it repeats almost every minute.

Does anyone have had similar problem and could advise me what to do?

Thank you in advance.

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MySQL starts automatically strange "SELECT * FROM a JOIN b USING" query
February 21, 2012 12:15PM


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