Presta 1.4.4.1 - high MySQL load

[domel]

Hi,

we have problem with MySQL on clinent's box, exactly it's a Percona 5.5.40 running on 2x Xeon E5-2620, 128GB ram. Some time ago they had many table locks (MyISAM) so they moved all the tables to InnoDB. It was working for a while. For now we observing many MySQL processess with status "Copying to tmp table", all or most of them are going to slow query log:

 

 

SELECT cp.`id_product_attribute`, cp.`id_product`, cu.`id_customization`, cp.`quantity` AS cart_quantity, cu.`quantity` AS customization_quantity, pl.`name`,
pl.`description_short`, pl.`available_now`, pl.`available_later`, p.`id_product`, p.`id_category_default`, p.`id_supplier`, p.`id_manufacturer`, p.`on_sale`, p.`ecotax`, p.`additional_shipping_cost`, p.`available_for_order`,
p.`quantity`, p.`price`, p.`weight`, p.`width`, p.`height`, p.`depth`, p.`out_of_stock`, p.`active`, p.`date_add`, p.`date_upd`, IFNULL(pa.`minimal_quantity`, p.`minimal_quantity`) as minimal_quantity,
t.`id_tax`, tl.`name` AS tax, t.`rate`, pa.`price` AS price_attribute, pa.`quantity` AS quantity_attribute,
pa.`ecotax` AS ecotax_attr, pl.`link_rewrite`, cl.`link_rewrite` AS category, CONCAT(cp.`id_product`, cp.`id_product_attribute`) AS unique_id,
IF (IFNULL(pa.`reference`, '') = '', p.`reference`, pa.`reference`) AS reference,
IF (IFNULL(pa.`supplier_reference`, '') = '', p.`supplier_reference`, pa.`supplier_reference`) AS supplier_reference,
(p.`weight`+ pa.`weight`) weight_attribute,
IF (IFNULL(pa.`ean13`, '') = '', p.`ean13`, pa.`ean13`) AS ean13, IF (IFNULL(pa.`upc`, '') = '', p.`upc`, pa.`upc`) AS upc,
pai.`id_image` as pai_id_image
FROM `ps_cart_product` cp
LEFT JOIN `ps_product` p ON p.`id_product` = cp.`id_product`
LEFT JOIN `ps_product_lang` pl ON (p.`id_product` = pl.`id_product` AND pl.`id_lang` = 1)
LEFT JOIN `ps_product_attribute` pa ON (pa.`id_product_attribute` = cp.`id_product_attribute`)
LEFT JOIN `ps_tax_rule` tr ON (p.`id_tax_rules_group` = tr.`id_tax_rules_group`
AND tr.`id_country` = 17
AND tr.`id_state` = 0)
LEFT JOIN `ps_tax` t ON (t.`id_tax` = tr.`id_tax`)
LEFT JOIN `ps_tax_lang` tl ON (t.`id_tax` = tl.`id_tax` AND tl.`id_lang` = 1)
LEFT JOIN `ps_customization` cu ON (p.`id_product` = cu.`id_product`)
LEFT JOIN `ps_product_attribute_image` pai ON (pai.`id_product_attribute` = pa.`id_product_attribute`)
LEFT JOIN `ps_category_lang` cl ON (p.`id_category_default` = cl.`id_category` AND cl.`id_lang` = 1)
WHERE cp.`id_cart` = 8295

AND p.`id_product` IS NOT NULL
GROUP BY unique_id
ORDER BY cp.date_add ASC;

 

We were trying to set almost all of the DB server parametrs, but without success, only killing apache / mysql helps for a few minutes. I checked that this problem exist when customers try to operate on a cart and adding groupon discount codes.

Do you have any suggestion for this problem? Does Presta 1.6 better handle mysql queries?

[shacker]

its better 1.6, how big is your store?

[domel]

About 500 products. Already we have solved the problem. Tables ps_customization and ps_customized_data was just too big (400k and 800k of records).

Edited November 6, 2014 by domel (see edit history)

[shacker]

use our free module delete connections to optimize your database

[vekia]

you can find these modules in free modules list

you can find there addons from several community members, also addons from shacker.